KR20070017337A - Dynamic network management system, dynamic network management device, and dynamic network management method - Google Patents

Abstract

A technique for providing global connectivity to a mobile node connected to a mobile access router forming a mobile network via a local fixed router is disclosed, and according to the technique, the mobile node 1000-1 is locally fixed. The global address of the access router (mobile access router 1200-1) connected via the router 1100-1 can be obtained. For example, the mobile node transmits a binding update message in which a special mark is embedded, or transmits a special packet. The mobile access router that has received the message or packet sent from the mobile node knows that the mobile node does not know the primary global address of the mobile access router by the received message or the received packet. Notify the global address.

Description

DYNAMIC NETWORK MANAGEMENT SYSTEM, DYNAMIC NETWORK MANAGEMENT DEVICE, AND DYNAMIC NETWORK MANAGEMENT METHOD}

The present invention relates to a communication network technology for providing global connectivity for a mobile network.

Currently, the Internet has developed to a stage where a large number of data communication networks are arranged around a system including fixed network nodes. These data communication networks are known as edge networks, and systems comprising fixed network nodes surrounded by these edge networks are known as core networks. With the advent and development of wireless technology, among these edge networks, the use of methods by wireless communication is increasing more and more, and a special edge network called a mobile network, i.e., a mobile network is formed (the following ratio). See Patent Document 1).

A mobile network is basically a network of nodes in which the entire network changes its point of connection to the Internet. Mobile networks usually require a mobile router (router that connects the mobile network to the Internet), and the connection point to the Internet between other access routers (the access router itself may be movable) by the mobile router. Is changed. Examples of mobile networks include networks carried by people (known as personal area networks, or PANs), networks including sensors arranged on vehicles such as cars, trains, ships, and aircraft. In mass transportation systems such as airplanes, trains, buses, and the like, passengers can access a remote host using a laptop, personal digital assistant (PDA), mobile phone, or the like, so that access to the Internet within a vehicle can be realized. It is also possible. Each node in such a mobile network is normally connected to a central device (i.e., mobile router), and even when the network moves, each node does not change its connection point. Instead, the connection point is changed by the mobile router so that the entire network moves.

Basically, when the entire network moves, it is a problem for the network to move to provide the nodes in the network so that the Internet connectivity is not interrupted. Nodes that exist in a moving network may not be aware that the network is changing the connection point to the Internet. In this regard, see Mobile IPv4 (see Non-Patent Document 2 below) in Internet Protocol Version 4 (IPv4) (see Non-Patent Document 3 below), which is referred to as the classic problem of mobility support. ) And mobile IPv6 (see Non-Patent Document 4 below) in Internet Protocol Version 6 (IPv6) (see Non-Patent Document 5 below). In Non-Patent Documents 2 and 4, the main purpose is to provide mobility support for each host, not for the entire network.

In mobile IP, each mobile node has a constant home domain. When the mobile node is connected to its own home network, the mobile node is assigned a constant primary global address known as the home address. On the other hand, in a state where the mobile node is separated from its home network, that is, connected to another external network, the mobile node is assigned a temporary global address, commonly known as a care-of-address. do. The idea of mobility support is to allow a mobile node to reach its home address, for example, even when the mobile node is connected to another external network. This idea is realized in the nonpatent literatures 2 and 4 by introduction of the entity of the home network known as a home agent. The mobile node uses the message known as the binding update to register the care-of address with the home agent. The home agent receives the message before the home address of the mobile node and transmits the packet to the care-of address of the mobile node using IP-in-IP tunneling (see Non-Patent Documents 6 and 7 below). Has the ability to In IP-in-IP tunneling, the original IP packet is encapsulated in a separate packet. The original packet may be called an inner packet, and the new packet that encapsulates the inner packet may be called an outer packet.

Extends the concept of mobility support for each host to mobility support for the network so that nodes existing in the mobile network are reachable by primary global addresses, without depending on the location on the Internet to which the mobile network connects. It is a problem to be solved. In this regard, there are several major attempts to solve the problem of moving networks. These are all based on mobile IP (refer nonpatent literature 2, 4).

One of the solutions in the network which moves is proposed by following patent document 1. As shown in FIG. Here, in the state which exists in a home domain, the mobile router which controls a mobile network performs the routing of the packet transmitted / received by a mobile network using arbitrary routing protocols. On the other hand, when the mobile router and its mobile network move to the external domain, the mobile router registers the care of address with the home agent. Then, an IP-in-IP tunnel is set up between the mobile router and the home agent, and the routing protocol that was in use when it was in the home domain is again executed on the IP-in-IP tunnel. That is, by this, all packets destined for the mobile network are received by the home agent and then transmitted to the mobile router via the IP-in-IP tunnel, from the mobile router towards the host in the mobile network, The packet is sent. In addition, when a node existing in the mobile network transmits a packet out of the network, the mobile router receives the packet and transmits the packet to the home agent through an IP-in-IP tunnel. The packet is sent from the home agent toward the predetermined receiver.

Moreover, the solution which is substantially the same as the solution mentioned above is also disclosed by following patent document 2. In addition, in patent document 2, especially about support for IPv6 (refer nonpatent literature 5) is mentioned only.

In the presence of various wireless technologies (ie Bluetooth, IEEE802.11a / b / g, ultra wideband, infrared, and general packet radio services), nested mobile networks (i.e. separate mobile networks) It is contemplated that there will be a mobile network existing within). According to this nest state, the problem known as ping-pong routing arises. On the other hand, in patent document 1, the solution by a nested tunnel is proposed. The nest tunnel is a state in which a tunnel established between a mobile router and a home agent of the mobile router is encapsulated by a separate tunnel established between a separate mobile router and a home agent of the separate mobile router. However, in this tunnel nesting, the transmission time of the packet is increased because it passes through one or more home agents until the packet reaches the final destination. In addition, a plurality of encapsulations may increase the packet size, possibly causing fragmentation of unnecessary packets.

In order to solve this problem, the following non-patent document 8 proposes another solution. The solution is to use reverse routing headers so that when the mobile network is nested (i.e., when the mobile network connects to another mobile network), multiplexing by excessive encapsulation does not occur. Here, the lowest order mobile network sets a reverse routing header in the tunnel packet to its home agent. Higher-order mobile routers existing on the path of this packet do not encapsulate in a separate IP-in-IP tunnel even when the packet is received. Instead, the source address of the packet is set. Copy to the reverse routing header and insert its care-of address into the source address. By this method, the home agent of the first mobile router can recognize the mobile router existing in the path between the first mobile router when the packet is received. In addition, when the home agent transmits a packet received to the first mobile router, the extension type 2 routing header is used so that the packet is sent directly to the first mobile router via another higher-order mobile router. do.

On the other hand, in the solution by reverse routing in Non-Patent Document 8, security is one of the important problems, but in Non-Patent Document 9 below, a method for solving the problem for optimizing the nest tunnel is proposed. This solution is known as a solution by an access router option (ARO) (ARO solution), where a new option is defined in the mobility header specified in mobile IPv6. From the sender (ie mobile router or mobile host) to the receiver (ie home agent or partner node), this new option (access router option) informs the primary global address of the access router to which the sender is connected. do. After sending the binding update message with the access router option, the mobile node (mobile router or mobile host) sends out a special signal called a "direct-forwarding-request" signal. Insert into a packet. By this signal, the upstream mobile access router sends its binding update toward its destination address. This process is repeated until the top-level mobile router is reached, and all upstream mobile access routers send binding updates to the sender so that the sender knows which set of mobile access routers the mobile node is connected to. It becomes possible. In this method, an extension type 2 routing header can also be constructed. When the node of the destination sends a packet to the mobile node, the routing header is embedded in the packet and passed through a series of mobile access routers. It is also possible to route packets directly to mobile nodes.

[Non-Patent Document 1] Devarapalli, V., et.al., "NEMO Basic Support Protocol", IETF Internet Draft: draft-ietf-nemo-basic-02.txt, Dec 2003.

[Non-Patent Document 2] Perkins, C.E.et.al., "IP Mobility Support", IETF RFC 2002, Oct 1996.

[Non-Patent Document 3] DARPA, "Internet Protocol", IETF RFC 791, Sep 1981.

[Non-Patent Document 4] Johnson, D.B., Perkins, C.E., and Arkko, J., "Mobility Support in IPv6", Internet Draft: draf-ietf-mobileip-ipv6-18.txt, Work In Progress, June 2002.

[Non-Patent Document 5] Deering, S., and Hinden, R., "Internet Protocol Version 6 (IPv6) Specification", IETF RFC 2460, Dec 1998.

[Non-Patent Document 6] Simpson, W., “IP in IP Tunneling”, IETF RFC 1853, Oct 1995.

[Non-Patent Document 7] Conta, A., and Deering, S., "Generic Packet Tunneling in IPv6", IETF RFC 2473, Dec 1998.

[Non-Patent Document 8] Thubert, P., and Molteni, M., "IPv6 Reverse Routing Header and Its Application to Mobile Networks", Internet Draft:

draft-thubert-nemo-reverse-routing-header-04.txt, Work In Progress, Feb 2004.

[Non-Patent Document 9] Ng, C. W., and Tanaka, T., "Securing Nested Tunnel Optimization with Access Router Option", Internet Draft:

draft-ng-nemo-access-router-option-00.txt, Work In Progress, Oct 2002.

[Non-Patent Document 10] Narten, T., Nordmark, E., and Simpson, W., "Neighbor Discovery for IPv6", IETF RFC 2461, Dec 1998.

[Non-Patent Document 11] Patridge, C., and Jackson, A., "IPv6 Router Alert Option", IETF RFC 2711, Oct 1999.

[Patent Document 1] Leung, K.K., "Mobile IP mobile router", US Patent 6,636, 498, Oct 2003.

[Patent Document 2] Markki, O.E., et. Al., "Mobile Router Support for IPv6", US Patent Application US20030117965A1, Mar 2002.

The sender is able to know the primary global address of the access router via a router notification message broadcast by the access router. Moreover, the router notification is specified in the nonpatent literature 10. As shown in FIG. In addition, in Non-Patent Document 9, an access router supporting the solution method is externally (upstream) by a router notification actively transmitted from an ingress interface that is an interface in the inner (downstream) network direction. It must actively broadcast the primary global address of the egress interface, which is the network-oriented interface. In the following, information in the router notification including the primary global address is referred to as "access router address information (Access-Router-Address-Information)", or abbreviated as "ARA-Info". In this way, the mobile node connected to the ingress interface of the access router knows the primary global address of the access router and also knows that the access router supports the solution by the ARO.

However, in an arrangement in which a local router intervenes between an inner mobile node and an outer mobile router, a problem arises. This is a state where the mobile node 1000-1 is connected to the local fixed router 1100-1, for example, as illustrated in FIG. 1. The local fixed router 1100-1 is connected to the mobile access router 1200-1 without moving. This arrangement is generally compared to large vehicles such as trains and ships. Here, using the mobile access router, access to the global internet for trains / ships is provided, while a local fixed router connected to the mobile access router is arranged in each vehicle / cabin of the train / ship. By this local fixed router, wireless connection in each vehicle / cabin is provided. A laptop (or PDA in a wireless PAN, a mobile router in a wireless PAN, etc.) operating as a mobile host can be connected to one of these local fixed routers.

In this arrangement, a situation may exist where a local fixed router 1100-1 exists between the mobile node 1000-1 and the mobile access router 1200-1. Since the local fixed router 1100-1 is connected to the mobile access router 1200-1 without moving, it does not need to have a mobility protocol or need to understand it. The local fixed router 1100-1 only transmits and receives packets between the mobile node 1000-1 and the mobile access router 1200-1. Therefore, the local fixed router 1100-1 does not use a protocol related to mobility, and the router notification sent from the local fixed router 1100-1 does not necessarily include its own primary global address. .

In this network arrangement, since the ARA-Info is not included in the router notification broadcast by the local fixed router 1100-1, the solution by the ARO does not function normally. In addition, although the router notification sent by the mobile access router 1200-1 may include the primary global address in the ARA-Info, the router notification is only sent with one hop setting, and the IPv6 protocol is operated. Since the router cannot send the router notification, the mobile node 1000-1 cannot receive the router notification sent by this mobile access router 1200-1.

As a very simple solution to the above problem, it is assumed that all local fixed routers in the mobile network can support the solution by ARO as well as the mobile router. However, in this solution, there is a problem that, firstly, compatibility with legacy routers (traditional routers) is lost, and secondly, a solution (mobility protocol) by ARO on a router that does not change the connection point. The problem is that by supporting a complete group of protocols that are enabled, the system adds unnecessary complexity. This results in an increase in development cost and maintenance cost.

According to the present invention, there is provided a dynamic network management system, a dynamic network management apparatus, and a dynamic network management method, in which an improvement on a solution by ARO has been made, as described in an embodiment having four different approaches described below. . In the first method, the mobile node 1000-1 embeds a special mark in the binding update message to be transmitted. The mobile access router 1200-1 scans this signal (special mark), finds that the sender (mobile node 1000-1) is trying to find the mobile access router 1200-1, and sends it to the sender. It notifies its primary global address.

In the second method, the mobile access router 1200-1 scans for all input packets and searches for the binding update message sent by the mobile node 1000-1. Since the mobile node 1000-1 uses a solution by the ARO, a special bit is set in the binding update message. The mobile access router 1200-1 knows that the sender supports the solution by the ARO, and does not know the primary global address of the access router, and notifies the sender of its primary global address. .

In the third method, the mobile node 1000-1 transmits a special packet to all routers upstream. The router supporting the ARO solution, when receiving this packet, responds with its own primary global address.

In the fourth method, the local fixed router 1100-1 includes a primary global address of the mobile access router 1200-1 to which the local fixed router 1100-1 is connected in a router notification message to be transmitted. Configured to add ARA-Info.

According to the present invention, even in a configuration in which a local fixed router is disposed between a mobile access router forming a mobile network and a mobile node connected to the mobile network, the mobile node and the mobile network are global. It becomes possible to provide connectivity.

BRIEF DESCRIPTION OF THE DRAWINGS The figure which shows the example of system structure applicable in common to Examples 1-4 of this invention,

2 is a flowchart showing an algorithm when a mobile node transmits a binding update message in Embodiment 1 of the present invention;

3 is a flowchart showing a method of processing an input packet received by the mobile access router from the ingress interface in Embodiment 1 of the present invention;

4 is a flowchart showing an algorithm when the mobile node transmits a binding update message in Embodiment 2 of the present invention;

5 is a flowchart showing a method of processing an input packet received by the mobile access router from the ingress interface in Embodiment 2 of the present invention;

6 is a flowchart showing an algorithm when the mobile node transmits a binding update message in Embodiment 3 of the present invention;

7 is a flowchart showing a method of processing an input packet received by the mobile access router from the ingress interface in Embodiment 3 of the present invention;

8 is a flowchart showing a method of processing an input packet received by the local fixed router from the egress interface in Embodiment 4 of the present invention;

Fig. 9 is a flowchart showing a method in which a local fixed router transmits a router notification from an ingress interface according to Embodiment 4 of the present invention.

In the present specification, a system for providing global connectivity to a mobile network including a legacy router, and apparatus and method related thereto are disclosed. Hereinafter, in order to make understanding of this invention easy, a term is defined.

(i) A "packet" is a self-contained unit of data of any format that can be transmitted over a data network. Usually, a "packet" is comprised of two parts, a "header" part and a "payload" part. The "payload" part contains data to be transmitted, and the "header" part contains information for supporting packet transmission. In addition, the "header" portion needs to include a sender address and a sender address in order to identify each of the sender and receiver of the "packet".

(ii) "Packet tunneling" relates to a packet encapsulated in a separate packet. The operation of "packet tunneling" is also called "encapsulation" of the packet, the encapsulated packet is called "tunneled packet" or "inner packet", and the packet encapsulating the "inner packet" is called "tunneling packet" or "outer packet". Also called. In the encapsulated packet, the entire "inner packet" forms the payload portion of the "outer packet".

(iii) A "mobile node" is a network element that changes a connection point to a global data communication network. This "mobile node" may be used as a term indicating an intelligent network hub capable of changing an end user terminal, a relay terminal such as a gateway or a router, or a connection point to a global data communication network. In addition, when the "mobile node" is an end user terminal, it is more clearly called a "mobile host", and when the "mobile node" is an intermediate network element functioning as a gateway, a router, an intelligent network hub, or the like, more clearly " Mobile router.

(iv) The "default router" of a network element is a router existing on the same link as the network element, and in this "default router", all packets whose transmission route from the network element on the link to the transmission destination are unknown. Is sent.

(v) The "access router" of a mobile node is a router through which a mobile node communicates in order to connect to a data communication network, and is usually a default router of a mobile node. In addition, the access router itself of the mobile node may be movable, and such a movable access router is known as a "mobile access router."

(vi) The "home address" is a basic global address assigned to the mobile node, and can be used to specify the position of the mobile node regardless of the connection point of the global data communication network to which the mobile node is connected. In this specification, the home address may be simplified to be referred to as HoA.

(vii) For a mobile node connected to a global data communication network, if the mobile node's home address has a topology that matches the address being used in the periphery of the connection point, then this mobile node is present in the "home". (at home) ”. In addition, the neighborhood area of this connection point is controlled by the unique management authority, and is called "home domain" of a mobile node.

(viii) For a mobile node connected to a global data communication network, if the mobile node's home address has a topology that does not match the address being used in the periphery of the access point, then the mobile node is “off from home”. It is called "away". In addition, the peripheral area of a connection point in this case is called "external domain."

(ix) The "care of address" is a temporary global address assigned to the mobile node in a state away from the home, and the assigned "care of address" is the perimeter of the connection point to which the mobile node connects to the global data communication network. It has the same topology as the address used in the area. In this specification, a care-of-address may be simplified to be referred to as CoA.

(x) "Home Agent" is a network entity that exists in the home domain of the mobile node. The "home agent" is a service of registering a care of address when the mobile node is away from home, and can transmit a packet whose home address of the mobile node is set to a sender to the care of address of the mobile node. Do. The home agent is also a router.

(xi) "Binding Update" is a message sent from the mobile node to the home agent, and is a message for notifying the home agent of the care-of address currently used by the mobile node. This enables the home agent to "bind" the relationship between the home address of the mobile node and the care of address. In addition, in this specification, a "Binding Update" may be simplified and called BU.

In the following description, specific numbers, times, structures, other parameters, and the like will be described in detail so that the present invention can be understood in detail. It is obvious that you can run

(Example 1)

In Embodiment 1 of the present invention, a case where a special mark is embedded in a packet header when a mobile node sends a binding update message will be described. Here, the upstream mobile access router notifies the mobile node of the HoA when it detects this special mark.

1 shows a system and a global communication network of a mobile node to which the present invention is applicable. The mobile node 1000-1 is connected to the local fixed router 1100-1, and the local fixed router 1100-1 is connected to the mobile access router 1200-1. In addition, here, for simplicity, only one local fixed router 1100-1 is connected to the mobile access router 1200-1, and the mobile node 1000-1 is connected to the local fixed router 1100-1. Although the case where only Taiwan is connected is displayed, in fact, the arbitrary number of local fixed routers 1100-1 can connect to the mobile access router 1200-1, and these local fixed routers 1100-1 Each mobile node 1000-1 can be connected to any number. Moreover, for those skilled in the art, it is clear that the present invention is applied even when such arbitrary number of local fixed routers 1100-1 and mobile nodes 1000-1 are connected.

Note that the mobile node 1000-1 is not particularly limited as to whether the mobile node 1000-1 is a mobile host or a mobile router, but the mobile node 1000-1 is actually a mobile access router 1200-1. It may be itself. In addition, although the term "mobile node" is used here, the generality as described above is not lost by this, but the term "mobile node" indicates that a mobile host, a mobile router, or the like is included. Moreover, it is clear to those skilled in the art that the present invention can be applied to both the case where the mobile node 1000-1 is a mobile host and the case where the mobile node 1000-1 is a mobile (access) router.

Also, although one local fixed router 1100-1 is shown on the path between the mobile node 1000-1 and the mobile access router 1200-1, in practice, the local fixed router 1100-1 is connected to the mobile node 1000-1. Multiple local fixed routers 1100-1 may be connected in parallel between the mobile access routers 1200-1. Moreover, in the case of those skilled in the art, even when there are one or more local fixed routers 1100-1 between the mobile node 1000-1 and the mobile access router 1200-1, the present invention is similarly applied. Obvious.

The mobile access router 1200-1 is also connected to the global data communication network 1600-1. This network 1600-1 is an arbitrary packet-switched network network and may be the Internet itself. Also, home agents 1400-1 and 1400-2 are connected to the global data communication network 1600-1, and home agents of the mobile node 1000-1 and the mobile access router 1200-1, respectively. It has a function as. In addition, the local fixed router 1100-1 always connected to the mobile access router 1200-1 does not have a mobility protocol and therefore does not require a home agent. In addition, the correspondent node 1500-1 receives the mobile node 1000-1 when the mobile node 1000-1 (or the mobile node 1000-1 is a mobile access router). Any node on the global data communication network 1600-1 that is continuing a traffic session with any mobile node present in the network).

The mobile node 1000-1 receives the router notification message from the local fixed router 1100-1 at the first startup, and constructs the CoA itself based on the prefix information reported by the router notification. Subsequently, the mobile node 1000-1 should notify the new CoA by sending a BU message to the home agent 1400-1 and the correspondent node 1500-1 so as to be associated with the HoA. . Since the router notification sent by the local fixed router 1100-1 does not include the ARA-Info, the mobile node 1000-1 cannot make the access router option included in the BU message to be sent. . Thus, instead, the mobile node 1000-1 embeds a special mark in the packet header of the BU message for instructing the upstream mobile access router to respond to each HoA. In addition, for the sake of simplicity, these marks will be referred to as "Access-Router-Address-Request" signals or "ARA-Req" which is an abbreviation thereof. ARA-Req can be represented by a specific bit or a stream of bits. For example, in IPv6, there is a hop-by-hop option known as a router alert option (see Non-Patent Document 11), and the above-mentioned special mark is assigned to a specific value in the router alert option. It may be represented by.

Local fixed router 1100-1 receives the packet, verifies the packet's validity, and forwards the packet upstream to mobile access router 1200-1. The mobile access router 1200-1 checks an input packet on the ingress interface and confirms which signal (for example, ARA-Req) is not embedded. When ARA-Req is detected, the mobile access router 1200-1 needs to perform special operations in addition to the normal processing for the input packet. First of all, the mobile access router 1200-1 is a new node for notifying its HoA of the mobile node 1000-1 (which can be specified by the source address field of the input packet having the ARA-Req signal). You must create a packet. Subsequently, this packet will be referred to as an "Access-Router-Address-Response" signal or "ARA-Res" which is an abbreviation thereof. Subsequently, the mobile access router 1200-1 first deletes or remarks the input packet having the ARA-Req signal so that the upstream router does not respond to the ARA-Req first. It is also possible to cause ARA-Res to be transmitted to the mobile node 1000-1 only from the mobile access router 1200-1 which has detected the ARA-Req signal in the packet. In addition, the mobile access router 1200-1 transmits an input packet having an ARA-Req signal upstream as it is, and when the mobile access router 1200-1 exists upstream, It is also possible to allow ARA-Res to be transmitted from the mobile access router 1200-1 to the mobile node 1000-1.

The following information should be included in the ARA-Res packet transmitted by the mobile access router 1200-1 to the mobile node 1000-1. (1) information indicating that this packet is a response to the ARA-Req, and (2) a value specifying the HoA of the mobile access router 1200-1. In addition, it is also possible to optionally include a part of the original packet (packet having ARA-Req) in the ARA-Res packet so that the mobile node 1000-1 can verify that it is a valid response.

Also, depending on how ARA-Req is realized, the exact method for deleting ARA-Req also varies. If the ARA-Req is a bit in the packet header, the mobile access router 1200-1 can delete the ARA-Req by simply removing the bit. In addition, when ARA-Req is realized as a value in the router warning option, the router warning option is ignored by routers arranged upstream as only the router warning option is removed or replaced by a separate value. It is possible to.

When receiving the ARA-Res packet including the HoA of the mobile access router 1200-1, the mobile node 1000-1 transmits the message to the home agent 1400-1 and / or the communication partner node 1500-1. With respect to this, it is possible to allow transmission processing of a new BU message with an access router option including the HoA of the mobile access router 1200-1. In this step, the mobile node 1000-1 does not need to insert the ARA-Req, but should act as prescribed by the solution by the ARO.

In other words, when transmitting the BU message, the mobile node 1000-1 follows the algorithm shown in FIG. In step S11000, the mobile node 1000-1 checks whether the HoA of its access router is known. If the HoA of the access router is known (known by the ARA-Info extracted from the router notification message or the previously received ARA-Res message), as shown in step S11100, the mobile node 1000-1. Inserts an access router option having the same value as the HoA of the access router into the BU. On the other hand, when the HoA of the access router is not known, as shown in step S11200, the mobile node 1000-1 inserts the ARA-Req signal into the packet header of the BU message.

In addition, regarding the mobile access router 1200-1, in the present invention, a slight change is required for the processing method regarding the input packet coming from one of the ingress interfaces. This change is shown in FIG. First, in step S12000, the mobile access router 1200-1 checks whether the ARA-Req signal is present in the packet. If no ARA-Req signal is found, the process proceeds to step S12300 and the mobile access router 1200-1 processes the normal input packet. On the other hand, if the packet contains the ARA-Req signal, the process proceeds to step S12300 after the processing of steps S12100 and S12200. That is, in step S12100, the mobile access router 1200-1 transmits an ARA-Res packet including the HoA to the source address described in the input packet, and in step S12200, the ARA-Res packet is input from the input packet. After deleting the -Req signal, the normal input packet in step S12300 is processed.

In addition, when storing the HoA of the mobile access router 1200-1, the mobile node 1000-1, together with information about the current default router (i.e., the local fixed router 1100-1), performs mobile access. It is necessary to store HoA of the router 1200-1. Accordingly, when the mobile node 1000-1 moves to a new location, the HoA of the stored mobile access router 1200-1 is also removed according to the change of the default router.

As described above, according to the first embodiment of the present invention, the mobile node can know the HoA of the upstream mobile access router even when there is another router between the mobile node and the mobile access router. This enables the mobile node to embed the access router option in the binding update message, and as a result, the solution by the ARO can function as a standard.

(Example 2)

In Embodiment 2 of the present invention, the mobile access router 1200-1 scans all input packets coming through the ingress interface to search for a binding update message sent by the mobile node 1000-1. It demonstrates. Here, the mobile node 1000-1 is using a solution by the ARO, and a special bit is set in the binding update message. The mobile access router 1200-1 knows that the sender supports the solution by the ARO, but does not know about the HoA of the access router. Therefore, the mobile access router 1200-1 receives the sender from the mobile access router 1200-1. The HoA is notified.

Also in Example 2, the arrangement example of this invention shown in FIG. 1 is referred. The mobile node 1000-1 receives the router notification message from the local fixed router 1100-1 at the first startup, and constructs the CoA itself based on the prefix information reported by the router notification. Subsequently, the mobile node 1000-1 sends a BU message to the home agent 1400-1 and the communication partner node 1500-1 so as to be associated with the HoA, and notifies the new CoA. Should be. Since the router notification sent by the local fixed router 1100-1 does not include the ARA-Info, the mobile node 1000-1 cannot make the access router option included in the BU message to be sent. .

On the other hand, the mobile node 1000-1 may use the solution by the ARO by using a predefined value (eg, all O or all 1 addresses) in the access router option as an option. It is possible to indicate that you do not (yet) know the HoA of the access router. In the ARO resolution method, the mobile node 1000-1 may request that the mobile node 1000-1 set a special bit in the BU message to use the ARO resolution method. Sometimes it is not necessary. In addition, by setting the above-described bits and lacking an access router option, the mobile node 1000-1 can sufficiently indicate that the access router's HoA is not known.

Local fixed router 1100-1 receives the packet, verifies the packet's validity, and forwards the packet upstream to mobile access router 1200-1. The mobile access router 1200-1 checks an input packet on the ingress interface to confirm whether or not the packet is related to a BU message. If a BU message is detected, the mobile access router 1200-1, in addition to the normal processing for the input packet, also indicates whether the sender is using the ARO resolution to indicate whether the BU is indicated by the BU. You should check.

The following information should be included in the ARA-Res packet transmitted by the mobile access router 1200-1 to the mobile node 1000-1. (1) information indicating that this packet is a message for notifying HoA of the mobile access router 1200-1, and (2) a value specifying the HoA of the mobile access router 1200-1. In addition, it is also possible to optionally include a portion of the original packet (packet with BU message) in the ARA-Res packet so that the mobile node 1000-1 can verify that it is a valid response.

When receiving the ARA-Res packet including the HoA of the mobile access router 1200-1, the mobile node 1000-1 transmits the message to the home agent 1400-1 and / or the communication partner node 1500-1. With respect to this, it is possible to allow transmission processing of a new BU message with an access router option including the HoA of the mobile access router 1200-1. In this step, the mobile node 1000-1 must act as defined by the solution by the ARO.

In other words, when the mobile node 1000-1 transmits a BU message, the mobile node 1000-1 follows the algorithm shown in FIG. In step S21000, the mobile node 1000-1 checks whether the HoA of its access router is known. If the HoA of the access router is known (known by the ARA-Info extracted from the router notification message or the previously received ARA-Res message), as shown in step S21100, the mobile node 1000-1. Inserts an access router option with the same value as the HoA of the access router into the BU. On the other hand, when the HoA of the access router is not known, the mobile node 1000-1 uses the solution by the ARO, as shown in step S21200, but the HoA of the access router is The BU message is sent so that all nodes verifying the BU message can know that they do not know. That is, in step S21200, the mobile node 1000-1 does not have an access router option and transmits a BU having information indicating the use of a solution by the ARO.

In addition, regarding the mobile access router 1200-1, in the present invention, a slight change is required for the processing method regarding the input packet coming from one of the ingress interfaces. This change is shown in FIG. First, in step S22000, the mobile access router 1200-1 checks whether the input packet is a BU message. If it is not a BU message, normal input packets are processed as shown in step S22300. On the other hand, when the input packet is a BU message, in step S22100, the mobile access router 1200-1 further indicates that the sender of the BU message is trying to use a solution by the ARO, while the HoA of the access router Check whether the unknown is shown by the BU message. In addition, a bit indicating the use of the solution by the ARO is set, and an address in which the access router option does not exist, or an address in which the access router option is specifically described (for example, all O addresses or all 1 addresses). It is possible to assume that the sender of the BU message attempts to use a solution by the ARO, for example, while not knowing the HoA of the access router.

If the sender of the BU message is trying to use the solution by the ARO, and it is not confirmed that they do not know the HoA of the access router, the flow proceeds to step S22300, and the mobile access router 1200-1 performs the solution by the ARO. The normal input packet prescribed | regulated by is processed. On the other hand, if it is confirmed that the sender of the BU message attempts to use the solution by the ARO and does not know the HoA of the access router, the flow proceeds to step S22200, and the mobile access router 1200-1 sends an input packet. The ARA-Res packet including the HoA is transmitted to the described source address, and the normal input packet is processed in step S22300.

In addition, as in the first embodiment described above, when storing the HoA of the mobile access router 1200-1, the mobile node 1000-1 is configured with a current default router (that is, the local fixed router 1100-1). In addition to the information on the mobile access router (1200-1) it is necessary to store the HoA. Accordingly, when the mobile node 1000-1 moves to a new location, the HoA of the stored mobile access router 1200-1 is also removed according to the change of the default router.

As described above, according to the second embodiment of the present invention, even when another router exists between the mobile node and the mobile access router, the mobile node can know the HoA of the upstream mobile access router. As a result, the mobile node can embed the access router option in the binding update message, and as a result, it becomes possible to function the solution by the ARO as a standard.

(Example 3)

In Embodiment 3 of the present invention, a case where a mobile node transmits a special packet to all upstream routers will be described. Here, routers supporting the solution by the ARO respond with their respective home addresses.

Also in Example 3, the arrangement example of this invention shown in FIG. 1 is referred. The mobile node 1000-1 receives the router notification message from the local fixed router 1100-1 at the first startup, and constructs the CoA itself based on the prefix information reported by the router notification. Subsequently, the mobile node 1000-1 sends a BU message to the home agent 1400-1 and the communication partner node 1500-1 so as to be associated with the HoA, and notifies the new CoA. Should be. Since the router notification sent by the local fixed router 1100-1 does not include the ARA-Info, the mobile node 1000-1 cannot make the access router option included in the BU message to be sent. .

When such a situation occurs, the mobile node 1000-1 delays the transmission of the BU message, and instead transmits a special packet for requesting the acquisition of the HoA of each router to all upstream routers. This particular packet may take the form of an Internet Control Message Protocol (ICMP) with a particular type indicating that it is an address request from an access router, or the receiver includes a home address in the response of the router notification. It may be a normal router request message (see Non-Patent Document 10) having a special option of instructing the user to make it. Incidentally, for the sake of simplicity, the packet will be referred to as an "Access Router Address Probe message" later, or abbreviated as "ARA-Probe".

Since the mobile node 1000-1 does not know the existence of the upstream mobile access router 1200-1, a broadcast address or a multicast address must be used in the destination field of the ARA-Probe. In IPv6, an all-router multicast address associated with all routers is defined, and the mobile node 1000-1 can use this all-router multicast address as a destination address. Alternatively, a special multicast address associated only with the upstream router may be defined. In the following, this multicast address will be referred to as an "upstream router multicast address". In other words, this means that all routers implicitly ignore packets associated with upstream router multicast addresses received from their egress interface, while associated with upstream router multicast addresses received from the ingress interface toward the egress interface. It means to send a packet.

To limit the amount of distribution of packets by multicast addresses, a hop limit field is provided in IPv6 to limit the number of times a packet can be transmitted. The mobile node 1000-1 may use a small hop limit value (eg, 2 or 3) to suppress packet distribution.

In addition, although the local fixed router 1100-1 also receives the ARA-Probe, it is almost impossible to understand this packet, and transmission of this packet toward the upstream (ie, the mobile access router 1200-1). It is to do. When the mobile access router 1200-1 receives this packet, as described in the first embodiment of the present invention, the mobile access router 1200-1 faces the sender of this ARA-Probe (that is, the mobile node 1000-1). , ARA-Res is transmitted.

The mobile access router 1200-1 needs to include the following information in the ARA-Res packet with respect to the mobile node 1000-1. (1) information indicating that this packet is a response to the ARA-Probe, and (2) a value specifying the HoA of the mobile access router 1200-1. Optionally, it is also possible to include a portion of the original ARA-Probe message in the ARA-Res packet so that the mobile node 1000-1 can verify that it is a valid response. In addition, since the mobile access router 1200-1 responds by the ARA-Res, when it is not necessary to transmit the ARA-Probe upstream, the mobile access router 1200-1 performs a process of discarding a packet including the ARA-Probe. Alternatively, the ARA-Probe message can be deleted or invalidated to perform the same processing as a normal packet.

After receiving this ARA-Res, the mobile node 1000-1 can transmit the BU message in which the access router option is inserted. Subsequent operations of the mobile node 1000-1 and the mobile access router 1200-1 are defined by the original ARO solution. In addition, when the broadcast method is used, there is a possibility that the mobile node 1000-1 receives one or more ARA-Res. In this case, since it is suggested that the person who responded to the earliest is the closest, the mobile node 1000-1 preferably uses the ARA-Res received first.

In other words, when transmitting the BU message, the mobile node 1000-1 follows the algorithm shown in FIG. In step S31000, the mobile node 1000-1 checks whether the HoA of its access router is known. If the HoA of the access router is known (known by the ARA-Info extracted from the router notification message or by the previously received ARA-Res message), as shown in step S31100, the mobile node 1000-1. Sets an access router option in the BU having the same value as the HoA of the access router. On the other hand, if the HoA of the access router is not known, the flow advances to step S31200 to transmit the ARA-Probe. Then, as shown in step S31300, the mobile node 1000-1 enters a standby state of receiving a valid ARA-Res or timeout. If the valid ARA-Res is received, the mobile node 1000-1 proceeds to step S31100 and transmits a BU in which the access router option is inserted. In addition, the same value as the HoA value extracted from ARA-Res is used for the HoA value of the access router. On the other hand, when the timeout occurs, the mobile access router 1200-1 is considered not upstream of the mobile node 1000-1, and as shown in step S31400, the BU having no access router option is present. Transmission processing is performed.

In addition, regarding the mobile access router 1200-1, in the present invention, a slight change is required for the processing method regarding the input packet coming from one of the ingress interfaces. This change is shown in FIG. First, in step S32000, the mobile access router 1200-1 checks whether the input packet is ARA-Probe. If it is not ARA-Probe, the flow advances to step S32100, where the mobile access router 1200-1 performs normal input packet processing. On the other hand, if the packet is an ARA-Probe, the flow advances to step S32200, and the mobile access router 1200-1 transmits an ARA-Res packet including the HoA to the source address described in the input packet.

In addition, similarly to the first embodiment described above, when storing the HoA of the mobile access router 1200-1, the mobile node 1000-1 is configured with a current default router (that is, the local fixed router 1100-1). In addition to the information on the mobile access router (1200-1) it is necessary to store the HoA. Accordingly, when the mobile node 1000-1 moves to a new location, the HoA of the stored mobile access router 1200-1 is also removed according to the change of the default router.

As described above, according to the third embodiment of the present invention, even when another router exists between the mobile node and the mobile access router, the mobile node can know the HoA of the upstream mobile access router. This enables the mobile node to embed the access router option in the binding update message, and as a result, the solution by the ARO can function as a standard.

(Example 4)

In Embodiment 4 of the present invention, a case where a local fixed router is configured so that a primary global address of a mobile access router to which a local fixed router is connected may be added to a router notification message sent by the local fixed router itself. Explain.

Also in Example 4, the arrangement example of this invention shown in FIG. 1 is referred. Here, the local fixed router 1100-1 is configured to listen to the router notification sent by the default router (that is, the mobile access router 1200-1) from the egress interface.

When detecting that ARA-Info is included in the router notification, the local fixed router 1100-1 stores the address extracted from the ARA-Info. Subsequently, the local fixed router 1100-1 inserts an ARA-Info including the HoA of the default router into the router notification and transmits the router notification to the ingress interface. Accordingly, in the mobile node 1000-1, the local fixed router 1100-1 appears as if it is a mobile access router supporting a solution by the ARO. In practice, however, the local fixed router 1100-1 does not need to understand the main part of the solution by the ARO, but only from the router notification received from the mobile access router 1200-1. It is only necessary to know how to extract the HoA of the 1200-1, or how to insert the HoA of the mobile access router 1200-1 into the router notification transmitted by the local fixed router 1100-1 itself.

When storing the HoA of the mobile access router 1200-1, the local fixed router 1100-1, along with information about the current default router (ie, the mobile access router 1200-1), can access the mobile access router. It is necessary to store HoA of (1200-1). Accordingly, when the mobile node 1000-1 moves to a new location, the HoA of the stored mobile access router 1200-1 is also removed according to the change of the default router.

Therefore, in Embodiment 4 of the present invention, only the local fixed router 1100-1 is modified in order to perform the solution by the original ARO. In addition, the mobile node 1000-1 and the mobile access router 1200-1 both comply with the processing defined by the original ARO solution. 8 shows a change to the normal processing of incoming packets from the egress interface of the local fixed router 1100-1. In step S41000, the local fixed router 1100-1 first checks whether an input packet coming from the egress interface is a router notification. If the input packet is not a router notification, step S41100 is performed to execute normal processing (process possible by a general IP router) regarding the packet. On the other hand, when the input packet is the router notification, as shown in step S41200, the normal processing for the router notification is executed. Also, by this process, the local fixed router 1100-1 may change the configuration of the default router.

After this processing (process of step S41200), as shown in step S41300, the router notification is checked to confirm whether the router notification comes from the default router of the local fixed router 1100-1. In the case of not the router notification from the default router, in particular, the processing does not need to be performed. On the other hand, in the case of the router notification from the default router, the router notification is checked next in step S41400, and the router notification is performed. It is checked whether it contains ARA-Info. If ARA-Info is not included, as shown in step S41500, the internal variable for storing the HoA of the default router is deleted, and the router notification includes ARA-Info (HoA of the default router). If so, in step S41600, this address is stored in the above internal variable (stores HoA of the default router).

In addition, the change of the operation of the local fixed router 1100-1 described below is a case where a router notification is sent to an ingress interface. This change is shown in FIG. In step S42000, first, the local fixed router 1100-1 checks whether or not the HoA of the previously stored default router (i.e., the mobile access router 1200-1) is maintained (knowing). do. If the HoA is not maintained, step S42100 is performed, and the local fixed router 1100-1 transmits a router notification having no ARA-Info. On the other hand, if the HoA of the default router previously stored is maintained, the local fixed router 1100-1 inserts an ARA-Info including the HoA of the default router into the router notification, as shown in step S42200. do.

As described above, according to the fourth embodiment of the present invention, the mobile node may be configured as an upstream mobile access router even if there is a router between the mobile node and the mobile access router that does not completely support the ARO solution. Know HoA. This enables the mobile node to embed the access router option in the binding update message, and as a result, the solution by the ARO can function as a standard.

The present invention provides a global connection to a mobile node and a mobile network even in a configuration in which a local fixed router is disposed between a mobile access router forming a mobile network and a mobile node connected to the mobile network. It is possible to provide sex, and is applied to a technology related to a communication network for providing global connectivity to a mobile network, and particularly to a technology related to communication using IP.

Claims (33)

A dynamic network management system in a communication system having a mobile access router forming a mobile network, a local fixed router belonging to the mobile network, and a mobile node participating in the mobile network by connecting to the local fixed router, From the mobile node, as the information requesting the global address of the mobile access router is transmitted, from the mobile access router that receives the information from the mobile node via the local fixed router, to the mobile node, And configured to be notified of the global address of the mobile access router. A dynamic network management system in a communication system having a mobile access router forming a mobile network, a local fixed router belonging to the mobile network, and a mobile node participating in the mobile network by connecting to the local fixed router, From the mobile node that does not know the global address of the mobile access router, information indicating that the global address of the mobile access router is not transmitted is transmitted, and thus, from the mobile node via the local fixed router. And from the mobile access router receiving the information, inform the mobile node of the global address of the mobile access router. A dynamic network management system in a communication system having a mobile access router forming a mobile network, a local fixed router belonging to the mobile network, and a mobile node participating in the mobile network by connecting to the local fixed router, The global address of the mobile access router is stored in predetermined information storage means in the local fixed router that has received the information including the global address of the mobile access router, and further, for the mobile node from the local fixed router. And notify the global address of the mobile access router stored in the predetermined information storing means. A dynamic network management device disposed within a mobile access router capable of forming a mobile network, Connection means for accessing a local fixed router belonging to the mobile network, Information detecting means for detecting information requesting a global address of the mobile access router transmitted from any mobile node participating in the mobile network and transmitted by the local fixed router to the mobile access router; When the information is detected by the information detecting means, of the mobile access router transmitted to the mobile node that has transmitted the information via the local fixed router to notify the global address of the mobile access router. Response information transmission means for transmitting response information including the global address Dynamic network management device having. A dynamic network management device disposed within a mobile access router capable of forming a mobile network, Connecting means for connecting to a local fixed router belonging to the mobile network; Is sent from a mobile node participating in the mobile network and not knowing the global address of the mobile access router, and not knowing the global address of the mobile access router being transmitted to the mobile access router by the local fixed router. Information detecting means for detecting information indicating the effect; When the information is detected by the information detecting means, of the mobile access router transmitted to the mobile node that has transmitted the information via the local fixed router to notify the global address of the mobile access router. Response information transmission means for transmitting response information including the global address Dynamic network management device having. The method according to claim 4 or 5, Information deleting means for deleting the information from the packet including the information, when the information is detected by the information detecting means; Transmission means for transmitting the packet after the deletion of the information by the information deletion means toward a predetermined transmission destination set in the packet. Dynamic network management device having. The method according to claim 4 or 5, And a transmission means for transmitting the packet toward a predetermined transmission destination set in the packet including the information. The method according to claim 4 or 5, And a discarding means for discarding a packet containing said information. A dynamic network management device disposed within a mobile node capable of joining a mobile network formed by a mobile access router, Connecting means for connecting to any router belonging to the mobile network; When the global address of the mobile access router is not known, information requesting the global address of the mobile access router transmitted to the mobile access router by the router connected by the connection means is supplied to the router. Transmitting means for transmitting, Response information receiving means for receiving, from the router, response information containing the global address of the mobile access router transmitted by the mobile access router as a response to the information sent by the transmitting means. Dynamic network management device having. A dynamic network management device disposed within a mobile node capable of joining a mobile network formed by a mobile access router, Connecting means for connecting to any router belonging to the mobile network; In the case where the global address of the mobile access router is not known, information indicating that the global address of the mobile access router, which is transmitted to the mobile access router by the router connected by the access means, is not obtained. Transmitting means for transmitting to the router; Response information receiving means for receiving, from the router, response information containing the global address of the mobile access router transmitted by the mobile access router as a response to the information sent by the transmitting means. Dynamic network management device having. The method according to claim 9 or 10, Has information insertion means for inserting the above information into a header of a packet relating to a binding update message transmitted to a predetermined communication device, The transmitting means is configured to transmit the packet relating to the binding update message in which the information is embedded by the information inserting means. Dynamic network management device. The method according to claim 9 or 10, And the transmitting means is configured to transmit information indicating that the access router option can be used together with the transmission of the information. The method according to claim 9 or 10, Has a packet generating means for generating a special packet representing the information, The transmitting means is configured to transmit the special packet generated by the packet generating means Dynamic network management device. A dynamic network management device disposed within a local fixed router that is fixedly connected to a mobile access router forming a mobile network. Receiving means for receiving information including a global address of the mobile access router; Information storage means for storing the global address of the mobile access router received by the receiving means Dynamic network management device having. The method of claim 14, And a notification means for notifying a node connected under the local fixed router of the global address of the mobile access router stored in the information storage means. The method of claim 14, Determination means for determining whether or not the information received by the reception means has been transmitted from a default router of the mobile network; Storage control means for controlling the information storage means to store the global address of the default router only when it is determined by the determination means that it has been transmitted from the default router. Dynamic network management device having. The method of claim 14, And said information received by said receiving means is a router notification message of said mobile access router. The method of claim 15, And the notifying means is configured to notify the node by router notification including the global address of the mobile access router. A dynamic network management method capable of forming a mobile network and performed in a mobile access router connectable with a local fixed router belonging to the mobile network, An information detecting step of detecting information requesting a global address of the mobile access router transmitted from any mobile node participating in the mobile network and transmitted by the local fixed router to the mobile access router; If the information is detected in the information detecting step, the mobile access router being sent toward the mobile node that has transmitted the information via the local fixed router to notify the global address of the mobile access router. A response information transmission step of transmitting response information including a global address; Having a dynamic network management method. A dynamic network management method capable of forming a mobile network and performed in a mobile access router connectable with a local fixed router belonging to the mobile network, Is sent from a mobile node participating in the mobile network and not knowing the global address of the mobile access router, and not knowing the global address of the mobile access router being transmitted to the mobile access router by the local fixed router. An information detecting step of detecting information indicating the effect; If the information is detected in the information detecting step, the mobile access router being sent toward the mobile node that has transmitted the information via the local fixed router to notify the global address of the mobile access router. Response information transmission step of transmitting response information including a global address Dynamic network management method having a. The method of claim 19 or 20, An information deleting step of deleting the information from the packet including the information when the information is detected in the information detecting step; Transmission step of transmitting the packet after the deletion of the information in the information deletion step toward a predetermined transmission destination set in the packet. Dynamic network management method having a. The method of claim 19 or 20, And a transmission step of transmitting the packet toward a predetermined transmission destination set in the packet including the information. The method of claim 19 or 20, And a discarding step of discarding the packet including the information. A dynamic network management method that is possible to participate in a mobile network formed by a mobile access router, and is performed in a mobile node connectable to any router belonging to the mobile network. A transmission step of transmitting, to the router, information requesting the global address of the mobile access router transmitted by the connected router to the mobile access router when the global address of the mobile access router is not known; , A response information receiving step of receiving, from the router, response information containing the global address of the mobile access router transmitted by the mobile access router as a response of the information transmitted in the transmitting step. Dynamic network management method having a. A dynamic network management method that is possible to participate in a mobile network formed by a mobile access router, and is performed in a mobile node connectable to any router belonging to the mobile network. When the global address of the mobile access router is not known, information indicating that the global address of the mobile access router is transmitted to the mobile access router by the connected router is transmitted to the router. A transmission step to perform, A response information receiving step of receiving, from the router, response information containing the global address of the mobile access router transmitted by the mobile access router as a response of the information transmitted in the transmitting step; Dynamic network management method having a. The method of claim 24 or 25, Has an information insertion step of inserting the above information into a header of a packet relating to a binding update message sent to a predetermined communication device, In the transmitting step, transmitting the packet relating to the binding update message in which the information is embedded by the information insertion step. Dynamic network management method. The method of claim 24 or 25, And in the transmitting step, transmitting information indicating that an access router option can be used together with the transmission of the information. The method of claim 24 or 25, A packet generation step of generating a special packet representing the information, In the transmitting step, transmitting the special packet generated in the packet generation step Dynamic network management method. A dynamic network management method performed in a local fixed router that is fixedly connected to a mobile access router forming a mobile network, A receiving step of receiving information including a global address of the mobile access router; An information storing step of storing the global address of the mobile access router received in the receiving step in a predetermined information storing means; Dynamic network management method having a. The method of claim 29, And a notification step of notifying a node connected under the local fixed router of the global address of the mobile access router stored in the predetermined information storage means. The method of claim 29, A determination step of determining whether the information received in the reception step has been transmitted from a default router of the mobile network; A storage control step of controlling the predetermined information storage means to store the global address of the default router only when it is determined that the determination step has been sent from the default router. Dynamic network management method having a. The method of claim 29, The information received in the receiving step is a router notification message of the mobile access router. The method of claim 30, And in the notifying step, notifying the node by a router notification including the global address of the mobile access router.

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