JP3291712B2 - Global address resolution processing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wide area address solution processing method required by a transmitting terminal or a transmitting router for communication on the Internet constructed on a non-broadcast type wide area network.

In order to establish a dedicated connection or specify an optimal packet transfer route between a transmitting terminal or a transmitting router closest thereto and a destination terminal or a destination router closest thereto. In a conventional wide area address resolution processing method performed prior to a packet transfer processing, for example, an NHRP (Next Hope Resolution Protocol) is used.
The global address resolution processing has been performed using a global address resolution server that supports a process called ").

Accordingly, an address resolution request packet issued by a transmitting terminal or a transmitting router is transferred to a wide area address resolution server through a dedicated server access connection, and the wide area address resolution server performs a wide area address resolution process. The address resolution response packet issued by the resolution server has been sent back to the transmitting terminal or the transmitting router through the dedicated server access connection.

On the other hand, when transferring a small number of packets, the wide area address resolution processing is not performed because the wide area address resolution time is likely to become a bottleneck of packet transfer delay. Performs Internet routing processing, then performs closed address resolution within the subnet, transfers the user packet to a relay router provided at the boundary of the subnet, and the relay router hops by hop-by-hop for each user packet via the subnet. In this case, the user packet has been delivered to the destination terminal or the destination router.

[0005]

In such a conventional wide area address resolution processing method, when a dedicated connection is set between a destination side terminal and a transmission side terminal to perform high quality communication, a wide area address We needed to use a resolution server. However, this wide area address resolution server
There has been a problem that the installation cost becomes extremely large, for example, high-performance hardware is required to manage all addresses on the Internet, or servers are required to be distributed.

Further, if high-quality communication is not desired, a hop-by-hop packet can be relayed by a relay router, so a wide area address resolution server is not always necessary for packet communication. Therefore, there is a problem that the additional equipment cost required for the purpose of only setting a dedicated connection between the destination side terminal and the transmitting side terminal to improve the communication quality becomes extremely large.

[0007] An object of the present invention is to solve such a problem and perform a wide area address resolution process without using an expensive wide area address resolution server, such as an ATM network connection between a destination terminal and a transmission terminal. It is an object of the present invention to provide a method that can meet the demand for high quality communication for setting up a dedicated connection at a low cost.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in order to achieve the above-mentioned object, and has different inventions existing on the Internet constructed by using a single non-broadcast type wide area network. When communicating between terminals belonging to a subnet,
A wide area address resolution processing method for directly resolving a non-broadcast type wide area network address of a destination terminal from an Internet address of a destination terminal based on a request from a transmitting terminal,
The address resolution request packet issued by the transmitting terminal is forwarded to the destination terminal using the relay router, and based on this, the destination terminal performs address resolution processing, and the address resolution response packet issued by the destination terminal is transmitted. This is a wide area address resolution processing method characterized by sending back to a transmitting terminal using a relay router.

The relay router performs the address processing in the subnet and the routing processing between the subnets hop-by-hop without performing the wide area address resolution processing, so that the user packet is transmitted from the transmission terminal to the destination terminal. Have the ability to deliver up to. Therefore, in the wide area address resolution processing method according to the present invention, when the wide area address resolution processing is required, the wide area address resolution request packet is delivered from the transmitting terminal to the destination terminal using this relay router. On the other hand, the destination-side terminal has its own Internet address and non-broadcast-type wide area network address information, and therefore can easily create a wide area address resolution response packet. The wide area address resolution response packet is distributed from the destination terminal to the transmitting terminal using the relay router.

As a result, as long as the transmitting side terminal and the destination side terminal exist on the same non-broadcast type wide area network, wide area address resolution processing is performed without using an expensive wide area address resolution server. This makes it possible to meet the demand for improved communication quality at low cost.

[0011]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a view for explaining the Internet for carrying out the present invention, and FIG. 2 is a view showing a communication sequence of a wide area address solution processing method according to the present invention.

The Internet 10 shown in FIG.
It is built on a non-broadcast type wide area network such as the M network. The model of the Internet 10 is composed of subnets 1, 2, and 3. Subnet 1 and subnet 2 are connected via router 4, and subnet 2 and subnet 3 are connected via router 5. A terminal 6 is installed in the subnet 1, and a terminal 7 is installed in the subnet 3.

In such a network model,
If the non-broadcast wide area network is an ATM network, the transmitting ATM
It is assumed that the network IP terminal 6 establishes a dedicated wide area connection 8 (in this case, an ATM network connection) with the destination-side ATM network IP terminal 7 to perform communication.

In the communication sequence in this case, as shown in FIG. 2, first, a global address resolution request is generated in the terminal 6, and this transitions to the global address resolution request state 21 transmitted to the router 4. As a result, a transition is made to the global address resolution request packet transfer state 22, in which the global address resolution request packet is transferred from the terminal 6 to the router 4.

The router 4 transits to the packet relay state 23 in which the received packet is relayed and transmitted to the router 5. As a result, a transition is made to the global address resolution request packet transfer state 24, in which the global address resolution request packet is transferred from the router 4 to the router 5.

In the router 5, the received packet is relayed and transited to a packet relay state 25 for transmission to the terminal 7. As a result, a transition is made to the global address resolution request packet transfer state 26, in which the global address resolution request packet is transferred from the router 5 to the terminal 7.

Upon receiving the wide area address resolution request packet, the terminal 7 immediately performs its own address resolution processing, generates a wide area address resolution response packet, and transmits the generated packet to the router 5. Transition. As a result, a transition is made to the global address resolution response packet transfer state 28 in which the global address resolution response packet is transferred from the terminal 7 to the router 5.

The router 5 transits to a packet relay state 29 in which the received packet is relayed and transmitted to the router 4. As a result, a transition is made to the global address resolution response packet transfer state 30, in which the global address resolution response packet is transferred from the router 5 to the router 4.

In the router 4, the received packet is relayed and transited to the packet relay state 31 for transmission to the terminal 6. As a result, a transition is made to the global address resolution response packet transfer state 32, in which the global address resolution response packet is transferred from the router 4 to the terminal 6.

The terminal 6 that has received the wide area address resolution response packet transits to a connection control state 33 in which connection control processing for setting up an ATM network connection with the terminal 7 is performed. As a result, the state transits to the wide area connection setting state 34 in which the wide area connection is set between the terminal 6 and the terminal 7.

After the connection is set, the terminal 6 transits to a user packet transmission state 35 for transmitting a user packet using this connection. As a result, the state transits to the user packet transfer state 36 in which the user packet is transferred from the terminal 6 to the terminal 7. After this, finally, the terminal 7
Transitions to the user packet reception state 37, in which the user packet is received.

In this embodiment, the ATM network connection is set not only between the terminal 6 and the terminal 7 but also between the router 4 and the terminal 7 or between the terminal 6 and the router 5 as necessary. Can also. When setting between the router 4 and the terminal 7, the router 4 that has received the user packet from the terminal 6 performs the same operation as the terminal 6 in the above example. Also,
When setting between the terminal 6 and the router 5, the router 5 performs the same operation as the terminal 7 in the above example, and the router 5 receives a packet from the terminal 6 and transfers the packet to the terminal 7.

As described above, an ATM network is a typical example of a non-broadcast type wide area network, and an I / O network is a typical example of the Internet 10.
There is a P network. In this case, the terminal 6 and the terminal 7 are connected to the IP terminal for the ATM network adopting the ATM interface by the router 4.
And the router 5 is an ATM employing an ATM interface
The wide area connection 8 is an ATM-SV to the network IP router.
C (Switched Virtual Circuit: ATM network connection). In the wide area address resolution, the ATM address is resolved from the IP address of the destination terminal, and the wide area connection itself is an ATM network connection.
At the time of actual communication, IP over the connection of this ATM network
The packet is forwarded.

As described above, in the present invention, the global address resolution processing is performed without using any expensive global address resolution server. Therefore, according to the present invention, while transferring user packets using the same router as before,
When transferring a large number of packets to the same destination, when high quality and security such as wiretapping prevention are required, it is possible to set up a connection at the end and communicate without installing an expensive expansion server. It can be carried out.

[0025]

According to the present invention, the wide area address resolution processing which conventionally required an expensive wide area address resolution server can be performed by using the existing Internet router, and the destination side terminal and the transmission side terminal can be used. ATM between
It is possible to meet the demand for high quality communication for setting up a dedicated connection such as a network connection at a low cost.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating the Internet on a non-broadcast type wide area network for implementing a method according to the present invention.

FIG. 2 is a diagram showing a communication sequence of a wide area address solution processing method according to the present invention.

[Explanation of symbols]

 1, 2, 3 Subnet 4, 5 Router 6, 7 Terminal 8 Wide area connection 10 Internet on non-broadcast type wide area network 21-37 Each state of communication sequence

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Kazuyuki Ozawa 3-19-2 Nishi-Shinjuku, Shinjuku-ku, Tokyo Nippon Telegraph and Telephone Corporation (56) References Anthony Alles, ATM Internetworking, Nikkei BP Publishing Center , September 22, 1995, 1st edition, 1st print, pp. 102-107, Tsunemi Shitara, "Latest Information on Router Engineering," Computer & Network LAN, Ohmsha, Inc., 1996. January 1, Volume 14, Issue 4, Pages 12-15, 001, CSND199800891003 IEICE Technical Report, IN 96-8, April 15, 1996, 001, CSNG 199800816008 (58) (Int.Cl. ⁷ , DB name) H04L 12/56 H04L 12/66 H04L 12/46 H04L 12/28

Claims (1)

(57) [Claims] When communication is performed between terminals belonging to different subnets existing on the Internet constructed using a single non-broadcast type wide area network, a destination is determined based on a request from a transmission side terminal. In the wide area address resolution processing method for directly resolving the non-broadcast type wide area network address of the destination terminal from the Internet address of the destination terminal, an address resolution request packet issued by the transmitting terminal is transmitted to the destination terminal by using a relay router. Forwarding, the destination terminal performs an address resolution process based on the address, and sends an address resolution response packet issued by the destination terminal back to the transmission terminal using the relay router. .