WO2012139283A1

WO2012139283A1 - Method and appratus for address allocation

Info

Publication number: WO2012139283A1
Application number: PCT/CN2011/072686
Authority: WO
Inventors: 蒋胜; 傅瑜
Original assignee: 华为技术有限公司
Priority date: 2011-04-12
Filing date: 2011-04-12
Publication date: 2012-10-18
Also published as: CN102835094B; CN102835094A

Abstract

A method and an apparatus for address allocation are disclosed in the present invention. The present invention relates to the technical field of communications and solves the problem in the prior art that, in the current Dynamic Host Configure Protocol (DHCP), users can not reserve one Internet Protocol Version 6 (IPV6) address or a section of IPV6 addresses in a Dynamic Host Configure Protocol Version for IPV6 (DHCPV6) server address pool for a future specific usage. The solution provided in the embodiment of the present invention includes the following steps: a node is enabled to carry an address reservation option in its sending request by defining a new address reservation option; an IPV6 address is reserved for the node from the server address pool after the server has received the request carrying the option; then, the server allocates the reserved IPV6 address to the node when the node sends a request for the allocation of the reserved address. The embodiment of the present invention is applicable to a DHCPv6 protocol-based communication system.

Description

Address allocation method and device

The present invention relates to the field of communications technologies, and in particular, to an address allocation method and apparatus. Background technique

DHCP (Dynamic Host Configuration Protocol) is a protocol in which a DHCPV6 server automatically assigns an IP address to a node in the network. According to different support protocols, DHCP includes DHCPv4 that supports IPv4 and DHCPv6 (Active Host Configure Protocol for IPv6) that supports IPv6. DHCPv6 is a version of DHCP that supports IPv6 (Internet Protocol version 6, Internet Protocol version 6). The basic protocol specification is defined by RFC3315 (RFC: Request For Comments) of the IETF (Internet Engineering Task Force, Internet Engineering Task Force: The Most Authoritative Technology Standardization Organization of the Internet), and the IPv6 Stateless Address Autoconfiguration Protocol is completed. The completed function, DHCPv6 belongs to a stateful address configuration protocol. In the stateful address configuration process, the DHCPv6 server allocates a complete IPv6 address to the client, and the final server can record the assigned IPv6 address and the client binding relationship. In order to enhance the manageability of the network.

The typical networking of DHCPv6 generally includes the following two roles:

DHCPv6 client: A device that dynamically obtains IPv6 addresses, IPv6 prefixes, or other network configuration parameters.

DHCPv6 server: A device responsible for assigning IPv6 addresses, IPv6 prefixes, and other network configuration parameters to DHCPv6 clients. The DHCPv6 server can not only assign IPv6 addresses to DHCPv6 clients, but also assign IPv6 prefixes to them.

Currently, the process of assigning addresses to clients by the DHCPv6 server is divided into two categories: the address fast assignment process of interacting two messages and the address assignment process of interacting four messages.

As shown in Figure 1, the process of quickly assigning addresses to two messages is:

(1) The DHCPv6 client carries the Rapid Commit option in the Solicit message sent, indicating that the client wants the server to quickly assign an address/prefix and network configuration parameters to it;

(2) If the DHCPv6 server supports the fast allocation process, return the Reply text directly, and assign the IPv6 address/prefix and other network configuration parameters to the client. in case The DHCPv6 server does not support the fast allocation process. The IPv4 address and other network configuration parameters are assigned to the client by the process of assigning four messages. For details, refer to steps (2) ~ (4) in the address allocation process shown in Figure 2. .

The process of allocating four messages is shown in Figure 2. The address assignment of the four messages is as follows:

1) The DHCPv6 client sends a Solicit packet to the DHCPv6 server, requesting the DHCPv6 server to assign an IPv6 address/prefix and network configuration parameters.

(2) If the Rapid Commit option is not carried in the Solicit message, or the Rapid Commit option is carried in the Solicit message, but the server does not support the fast allocation process, the DHCPv6 server replies to the Advertise message to notify the client of the address that can be assigned to it. /prefix and network configuration parameters.

(3) If the DHCPv6 client receives notification messages from multiple servers, it selects one of the servers according to the order in which the messages are received, the server priority, etc., and sends a Request message to the server. The server confirms that it is assigned an address/prefix and network configuration parameters.

(4) The DHCPv6 server returns a Reply message, confirming that the address/prefix and network configuration parameters are assigned to the client.

As noted in RFC3315, DHCP can assign addresses and other configuration information through the DHCPV6 server. Addresses and other configuration information are implemented by inclusion in the options. When the client requests the DHCPv6 server to allocate an address, it can include the IA_TA (Identity Association - Temporary Address) option in the text option of the Request text to tell the server to request the temporary address to be assigned, and the ΙΑ_ΤΑ option can be used at the same time. Contains the address it needs. After the server receives the client's request, it assigns the client the temporary address it needs. At the same time, RFC3315 also states that DHCP can extend the use of DHCP by defining new options.

The inventors have found that at least the following problems exist in the prior art:

In the current DHCP protocol, users cannot reserve a certain or a certain IPv6 address in the DHCPV6 server address pool for future special use. That is, the client wants the server to reserve these IPv6 addresses for a period of time, temporarily not allocated. Used by other clients.

Summary of the invention An embodiment of the present invention provides an address allocation method and apparatus, which adds an IPv6 address reservation function to a DHCP protocol, that is, a DHCPV6 server reserves an IPv6 address for a node in an address pool.

In order to achieve the above object, the embodiment of the present invention adopts the following technical solutions:

An address allocation method includes:

Receiving an address reservation option sent by the node, where the address reservation option includes IPv6 address information;

When the IPv6 address corresponding to the IPv6 address information exists, the IPv6 address corresponding to the IPv6 address information is marked as a reserved address, and the correspondence between the node and the reserved address is recorded;

When the address that is required to be allocated in the received address allocation option is the reserved address, it is determined whether the node corresponding to the reserved address is the same as the node corresponding to the reserved address;

When the node that requests the address is the same as the node corresponding to the reserved address, the reserved address is assigned to the node that requests the address.

An address allocation device includes:

a first receiving unit, configured to receive an address reservation option sent by the node, where the address reservation option includes IPv6 address information;

a first processing unit, configured to mark, according to the IPv6 address corresponding to the IPv6 address information, an IPv6 address corresponding to the IPv6 address information as a reserved address, and record between the node and the reserved address Correspondence relationship

a first determining unit, configured to determine, when the address to be allocated in the received address allocation option is the reserved address, whether the node corresponding to the reserved address is the same as the node corresponding to the reserved address;

And an allocating unit, configured to allocate the reserved address to the node that requests the address when the node that needs to allocate the address is the same as the node corresponding to the reserved address.

The address allocation method and device provided by the embodiment of the present invention, the solution defines a new address reservation option, so that the node can send an address reservation option in the sending request, after the server receives the request to carry the option, The IPv6 address is reserved for the node from the address pool of the server. When the node sends a request for the allocation of the reserved address in the future, the server allocates the reserved IPv6 address to the node. Therefore, as long as the embodiment of the present invention is adopted The solution provides an IPv6 address reservation function for the DHCP protocol, which enables the node to reserve the required IPv6 address by applying in advance, so as to prevent a situation where a large number of applications cause a shortage of addresses and the node cannot obtain the required IPv6 address. It is convenient for users to make arrangements in advance. DRAWINGS

1 is a schematic diagram of a fast address allocation process of two messages exchanged between a DHCPv6 server and a client in the prior art;

2 is a schematic diagram of an address allocation process of four messages exchanged between a DHCPv6 server and a client in the prior art;

3 is a flowchart of an address allocation method according to Embodiment 1 of the present invention;

4 is a schematic structural diagram of an address allocation apparatus according to Embodiment 1 of the present invention;

FIG. 5 is a schematic diagram of a format of an address reservation option according to Embodiment 2 of the present invention; FIG.

6 is a flowchart of a method for applying for a reserved address based on four messages of a DHCPv6 server and a client interaction according to Embodiment 2 of the present invention;

FIG. 7 is a flowchart of a method for requesting a reserved address based on two messages exchanged between a DHCPv6 server and a client according to Embodiment 2 of the present invention;

8 is a flow chart of a method for obtaining a reserved address after applying for a reserved address according to Embodiment 2 of the present invention;

FIG. 9 is a schematic structural diagram of an address allocation apparatus according to Embodiment 2 of the present invention.

detailed description

The address allocation method and apparatus of the embodiments of the present invention are described in detail below with reference to the accompanying drawings.

Example 1

As shown in FIG. 3, this embodiment provides an address allocation method, including: Step 301: Receive an address reservation option sent by a node, where the address reservation option includes IPv6 address information;

Step 302: When an IPv6 address corresponding to the IPv6 address information exists, mark the IPv6 address corresponding to the IPv6 address information as a reserved address, and record a correspondence between the node and the reserved address.

Step 303: When the address that is required to be allocated in the received address allocation option is the reserved address, determine whether the node corresponding to the reserved address is the node corresponding to the reserved address. Same

Step 304: When the node that requires the address allocation is the same as the node corresponding to the reserved address, allocate the reserved address to the node that requests the address.

As shown in FIG. 4, the embodiment provides an address allocation apparatus, including: a first receiving unit 401, configured to receive an address reservation option sent by a node, where the address reservation option includes IPv6 address information;

The first processing unit 402 is configured to mark, according to the IPv6 address corresponding to the IPv6 address information, an IPv6 address corresponding to the IPv6 address information as a reserved address, and record between the node and the reserved address. Correspondence relationship;

The first determining unit 403 is configured to determine, when the address requested to be allocated in the received address allocation option is the reserved address, whether the node corresponding to the reserved address is the same as the node corresponding to the reserved address;

The allocating unit 404 is configured to allocate the reserved address to the node that requests the address when the node that needs to allocate the address is the same as the node corresponding to the reserved address.

The address allocation method and device provided by the embodiment of the present invention, the solution defines a new address reservation option, so that the node can send an address reservation option in the sending request, after the server receives the request carrying the option. The IPv6 address is reserved for the node from the address pool of the server. When the node sends a request for the allocation of the reserved address in the future, the server allocates the reserved IPv6 address to the node. Therefore, as long as the solution provided by the embodiment of the present invention is adopted, the node can reserve the required IPv6 address by applying in advance, thereby preventing the situation that a large number of applications cause a shortage of addresses and the node cannot obtain the required I Pv6 address in the future, which is convenient. The user makes arrangements in advance.

Example 2

In this embodiment, DHCPv6 supporting IPv6 is taken as an example. This embodiment provides an address allocation method, and a new DHCP option needs to be added. As shown in Figure 5, this option is used to pass information to the IA_RA ( Identity As sociat - Reserved Address). The newly defined option is the address reservation option 0PTI0N_IA_RA, which contains:

Option type ( opt ion-code ) : opt ion-code is used to indicate that this option is an address reservation option. The definition of the value needs to be assigned by the standard organization after the official standard is released.

Option length ( option-len ): option-len is used to indicate the entire address reservation Length of item, length value = length of IAID (4) + length of IA_RA-options, in bytes;

IAID (Identity Set Identifier): The IAID is used to identify the reserved address IA_RA, the IAID is the unique identifier of IA_RA, the IAID must be different from the other IA_RA of the client; Other options (IA_RA-options): Other options are associated with IA_RA The options, other options include reserved address information, that is, the reserved address I A_RA belongs to the sub-option under other options.

The address allocation method in the embodiment of the present invention includes two schemes in which two messages are exchanged between the DHCPv6 server and the client, and the four messages are based on interaction. The address allocation method shown in FIG. 6 is based on the interaction of four messages. Apply for a reserved address, including:

Step 601: The DHCPV6 server receives the Solicit message sent by the client, where the message is used to locate the DHCPv6 server and request the server to allocate an IPv6 address to the client.

Step 602: The DHCPv6 server that is available in the network returns an Advertise message to the client, where the Advertise text is used to notify the node that the node can be assigned an IPv6 address, and the client returns the Adver ti according to the Advertise message. Select the DHCPV6 server that meets the requirements in the server of the se message.

Step 603: The selected server receives the Request message sent by the client, where the Request message includes an address reservation option, and the address reservation option includes the IPv6 address information to be reserved.

This address reservation option is used to tell the server that the client needs to request to reserve an IPv6 address or an IPv6 address prefix. In the other options of the address reservation option ( IA_RA-options ), you need to specify the reserved IPv6 address information. You can specify the reserved IPv6 address or IPv6 address prefix. The prefix length is greater than 64 bits and less than 128 bits. address).

Step 604: Determine whether there is a corresponding IPv6 address in the IPv6 address information. If an IPv6 address corresponding to the IPv6 address information exists, go to step 605. If the IPv6 address corresponding to the IPv6 address information does not exist, perform the step. 606.

Step 605: Mark the IPv6 address corresponding to the IPv6 address information as a reserved address, and record the correspondence between the client and the reserved address.

Moreover, in step 605, the DHCPV6 server may send a Reply packet to the client, and carry a reservation success message in the Reply packet. Step 606: The DHCPV6 server returns a reservation failure message to the client. In a specific implementation, the DHCPV6 server may send a Reply packet to the client, and carry a reservation failure message in the Reply packet.

In addition to the application of the address allocation scheme based on the four message exchanges shown in FIG. 6, the embodiment of the present invention can also apply for a reserved address by using an address allocation scheme based on the interaction of two messages, as shown in FIG. 7. The address allocation method specifically includes:

Step 701: The DHCPV6 server receives the So ic i t message sent by the client, and the So ic i t message carries the Rapid Commi t option and the address reservation option OPTION_IA_RA.

The Rapi d Commi t option and address reservation options are used to identify that the client wants the server to quickly reserve an IPv6 address or IPv6 prefix for it. The other option IA_RA-opt ions in the address reservation option contains the address information to be reserved. You can specify the reserved IPv6 address or IPv6 address prefix (the prefix length is greater than 64 bits and less than 128 bits, which is used to reserve an IPv6 address. ).

Step 702: Determine whether the DHCPV6 server supports fast allocation and whether there is an IPv6 address corresponding to the IPv6 address information. If the DHCPV6 server supports fast allocation and the IPv6 address corresponding to the IPv6 address information exists, step 703 is performed; If the IPv6 address corresponding to the IPv6 address information exists or does not support fast allocation, step 704 is performed.

Step 703: Mark the IPv6 address corresponding to the IPv6 address information as a reserved address, and record the correspondence between the client and the reserved address.

In addition, in step 703, the DHCPV6 server may send a reply message to the client, and carry a reservation success message in the reply message.

Step 704: The DHCPV6 server sends a Reply message to the client, and carries a reservation failure message in the Reply message.

Preferably, the corresponding IPv6 address in the IPv6 address information includes an IPv6 address or an IPv6 address prefix, which can be represented in multiple manners, and an IPv6 address can be represented by setting a specific rule. For example, in other options of the address reservation option, the IPv6 address information includes an IPv6 address, and the IPv6 address corresponding to the IPv6 address information is the one IPv6 address; or the IPv6 address information includes an IPv6 address prefix. The IPv6 address corresponding to the IPv6 address information is all IPv6 addresses represented by the IPv6 address prefix; or the IPv6 address information includes two IPv6 addresses, and the IPv6 address information The IPv6 address corresponding to the information is the two IPv6 addresses and all IPv6 addresses between the two IPv6 addresses. In this way, the server can identify the addresses that need to be reserved and allocate according to such rules.

Preferably, in order to identify and manage the reserved address, the address reservation option further includes an IAID. The IAID is a unique identifier for IA_RA, and the IAID must be different from the other IA_RAs of the client.

Preferably, in order to ensure that the server can identify the client in the future to obtain the reserved address, the correspondence between the client and the reserved address needs to be recorded, and the client and the The correspondence between the reserved addresses is: recording the correspondence between the media access control address (MAC) address of the client and the reserved address, or recording the MAC address and the IAID combination. The correspondence between the client and the reserved address.

Preferably, in addition, in step 603, or in step 701, the reserved period (li fet ime ) of the reserved address or the address segment may be included in other options ( IA_RA-opt ions ) in the address reservation option. That is, within the reserved period, the DHCPv6 server reserves the IPv6 address or IPv6 address prefix for the client in the address pool and does not assign it to other clients. During the reservation period, it is determined whether the client that requires the address allocation is the same as the client corresponding to the reserved address; and after the reservation period expires, the DHCPv6 server releases the reserved IPv6 address or IPv6 address segment. The IPv6 address corresponding to the IPv6 address information is removed as a mark of the reserved address, and the corresponding relationship between the client and the reserved address is deleted. After the release, the IPv6 address or IPv6 address segment can be allocated to other clients to avoid wasting resources.

After completing the application for reserving the address step shown in FIG. 6 or FIG. 7 , during the reservation period, when the client needs to use the reserved IPv6 address or IPv6 address segment, as shown in FIG. 8 , the user can press The steps apply to obtain the reserved address and complete the address assignment:

Step 801: Send a Reques t message to the server, where the Reques t message includes an address reservation option, and the address reservation option includes an IPv6 address information.

Step 802: When the server requests the allocated IPv6 address to be the reserved address, the server determines whether the client that needs to allocate the IPv6 address is the same as the client corresponding to the reserved address. When the client that requires the address allocation is the same as the client corresponding to the reserved address, step 803 is performed; When the clients corresponding to the reserved addresses are different, step 804 is performed.

Step 803: Allocate the reserved address to the node that requires an IPv6 address to be allocated. Step 804: Reject the reserved address for the client that requires the IPv6 address to be allocated. In addition, the DHCPv6 server can send a Rep ly message to the client, and carry the allocation failure information in the Reply message.

Step 805: When the reservation period has not expired, the DHCPV6 server receives the Renew (update) packet sent by the client, where the Renew packet includes an address reservation option 0PTI0N_IA_RA, where the address reservation option is The IPv6 address information is included; the IPv6 address information in the address reservation option carried in the Renew address is updated, and the reservation period corresponding to the IPv6 address information is updated, so that the DHCPV6 server continues to reserve the IPv6 for the client. Address or IPv6 address segment.

Step 806: After the reservation period expires, the DHCPV6 server releases the reserved IPv6 address or the IPv6 address segment. The IPv6 address corresponding to the IPv6 address information is removed as a mark of the reserved address, and the corresponding relationship between the client and the reserved address is deleted. After the release, the IPv6 address or IPv6 address segment can be allocated to other clients to avoid wasting resources.

This embodiment provides an address allocation apparatus. Similarly, the address allocation includes two schemes based on the interaction of two messages and four messages, as shown in FIG. 9, the address allocation based on the interaction of four messages. Device, including:

The second receiving unit 901 is configured to receive a So1 ic packet sent by the client, where the packet is used to locate the DHCPv6 server and request the server to allocate an address for the client.

The notification unit 902 is configured to return an Adveriti message to the client, where the Advert is used to notify the client that an IPv6 address can be assigned to the client. The client can select a DHCPV6 server that meets the requirements from the DHCPV6 server that has returned the Adverit message according to the Adver t se message.

The first receiving unit 903 is configured to receive, by the client, a Reques t packet, where the Reques t packet includes an address reservation option, and the address reservation option includes the IPv6 address information that needs to be reserved. This address reservation option is used to tell the server client to apply for an IPv6 address or IPv6 address prefix. In the other options of the address reservation option ( IA_RA-opt i ons ), you need to specify the IPv6 address information to be reserved. You can specify the reserved IPv6 address or IPv6 address prefix. The prefix length is greater than 64 bits and less than 128 bits. Leave a piece of IPv6 Address).

The second determining unit 904 is configured to determine whether an IPv6 address corresponding to the IPv6 address information exists.

The first processing unit 905 is configured to mark the IPv6 address corresponding to the IPv6 address information as a reserved address, and record a correspondence between the client and the reserved address.

The first replying unit 906 is configured to send a reply message to the client to notify the reservation that the reservation is successful. The method is further configured to send a reply message to the client, and notify the reservation that the reservation fails.

In addition, as shown in FIG. 9, in the address allocation apparatus based on the two messages, the first receiving unit 903 is further configured to receive the So lic message sent by the client, and request the message So. l The ic it packet carries the Rapi d Commi t option and the address reservation option 0PTI0N_ IA_RA. The Rapi d Commi t option and address reservation options are used to identify that the client wants the server to quickly reserve an IPv6 address or IPv6 prefix for it. In the other options of the address reservation option ( IA_RA-opt ions ), the address information to be reserved may be specified, and the reserved IPv6 address or IPv6 address prefix may be specified (the prefix length is greater than 64 bits and less than 128 bits, and used to reserve a segment. IPv6 address).

The second determining unit 904 is further configured to determine whether the DHCPv6 server supports fast allocation and whether a corresponding address exists.

The first processing unit 905 is further configured to mark the IPv6 address corresponding to the IPv6 address information as a reserved address, and record a correspondence between the client and the reserved address.

The first replying unit 906 is further configured to send a Reply message to the client, and carry a reservation success message in the Reply message; and also send a Reply message to the client, and carry the reservation in the Reply message. Failure message.

After the application for the reserved address, as shown in FIG. 9, in order to complete the allocation of the reserved address, the client obtains the reserved address, and the address reservation device further includes:

The third receiving unit 907 is configured to receive the Reques t message sent by the client to the DHCPV6 server, where the Reques t message includes an address allocation option, and the address allocation option includes the IPv6 address information.

The first determining unit 908 is configured to determine, when the IPv6 address that is required to be allocated in the received address allocation option is the reserved address, whether the client that requires the address allocation is the same as the client corresponding to the reserved address. The allocating unit 909 is configured to allocate the reserved address to the node that requires the IPv6 address to be allocated; and is further configured to refuse to allocate the reserved address to the client that requires the IPv6 address to be allocated.

The second reply unit 910 is configured to send a reply message to the client, and reply to the assignment success or rejection information.

The update unit 911 is configured to: when the reservation period has not expired, receive a Renew message sent by the client, where the Renew message includes an address reservation option (OPTION_IA_RA), and the address reservation option The IPv6 address information is included in the address reservation option of the Renew message, and the reservation period corresponding to the IPv6 address information is updated, so that the DHCPV6 server continues to reserve the address for the client. IPv6 address or IPv6 address segment.

The second processing unit 912 is configured to: after the expiration of the reservation period, the DHCPV6 server releases the reserved IPv6 address or the IPv6 address segment. The IPv6 address corresponding to the IPv6 address information is removed as a mark of the reserved address, and the corresponding relationship between the client and the reserved address is deleted. After the release, the IPv6 address or IPv6 address segment can be allocated to other clients to avoid wasting resources.

Preferably, the corresponding IPv6 address in the IPv6 address information includes an IPv6 address or an IPv6 address prefix, which can be represented in multiple manners, and the specific rule can be used to indicate the address. For example, in other options of the address reservation selection, the IPv6 address information includes an IPv6 address, and the IPv6 address corresponding to the IPv6 address information is the one IPv6 address; or the IPv6 address information includes an IPv6 address prefix. The IPv6 address corresponding to the IPv6 address information is the IPv6 address represented by the IPv6 address prefix; or the IPv6 address information includes two IPv6 addresses, and the IPv6 address corresponding to the IPv6 address information is the two An IPv6 address, and all IPv6 addresses between the two IPv6 addresses. In this way, the DHCPv6 server can identify and allocate IPv6 addresses that need to be reserved according to such rules.

Preferably, in order to identify and manage the reserved address, the address reservation option further includes an IAID. The IAID is a unique identifier for IA_RA, and the IAID must be different from the other reserved addresses (IA-RA) of the client.

Preferably, in order to ensure that the server can identify the client in the future to obtain the reserved address, the correspondence between the client and the reserved address needs to be recorded. Recording the correspondence between the client and the reserved address is: recording a correspondence between the MAC address of the client and the reserved address or recording the location by a combination of a MAC address and an IAID Corresponding relationship between the client and the reserved address.

Preferably, in this embodiment, the client on the same link is used as an example. In this embodiment, the node may be applied to a node, and the node includes a DHCPv6 client or a DHCPv6 proxy server. The DHCPv6 proxy server is a DHCPv6 client and a DHCPv6 server. The DHCPv6 proxy server can be used to request an IPv6 address from the DHCPv6 server and be assigned to the DHCPv6 client. Therefore, this embodiment is of course applicable to the DHCPv6 proxy server. Generally, the DHCPv6 proxy server requires a large number of IPv6 addresses, so it will apply for a reserved address segment. , I won't go into details here.

The address allocation method and device provided by the embodiment of the present invention, the solution defines a new address reservation option, so that the node can send an address reservation option in the sending request, after the server receives the request carrying the option. The I Pv6 address is reserved for the node from the address pool of the server. When the node sends a request for the allocation of the reserved address in the future, the server allocates the reserved IP address to the node. Therefore, as long as the solution provided by the embodiment of the present invention is adopted, the node can reserve the required IPv6 address by applying in advance, thereby preventing the situation that a large number of applications cause a shortage of addresses and the node cannot obtain the I Pv6 address in the future, which is convenient. The user makes arrangements in advance.

The scheme of the address allocation apparatus in this embodiment may adopt the scheme of the address allocation method in this embodiment, and details are not described herein again.

Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be implemented by means of software plus necessary general hardware, and of course, by hardware, but in many cases, the former is a better implementation. . Based on such understanding, the technical solution of the present invention, which is essential or contributes to the prior art, may be embodied in the form of a software product stored in a readable storage medium, such as a floppy disk of a computer. A hard disk or optical disk or the like includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform the methods described in various embodiments of the present invention.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto, and any person skilled in the art can easily within the technical scope disclosed by the present invention. All changes or substitutions contemplated are intended to be included within the scope of the invention. Therefore, the scope of the invention should be determined by the scope of the claims.

Claims

Claim

An address allocation method, comprising:

When the node that requests the address is the same as the node corresponding to the reserved address, the reserved address is allocated to the node that requests the address.

The address allocation method according to claim 1, wherein the method further comprises:

When there is no IPv6 address corresponding to the IPv6 address information, a reservation failure message is returned to the node.

When the node that requests the allocation of the address is different from the node corresponding to the reserved address, the node that is required to allocate the address is refused to be allocated the reserved address.

4. The address allocation method according to claim 1, wherein:

The IPv6 address information includes an IPv6 address, and the IPv6 address corresponding to the IPv6 address information is the one IPv6 address; or

The IPv6 address information includes an IPv6 address prefix, and the IPv6 address corresponding to the IPv6 address information is all IPv6 addresses represented by the IPv6 address prefix; or

The IPv6 address information includes two IPv6 addresses, and the IPv6 address corresponding to the IPv6 address information is the two IPv6 addresses and all IPv6 addresses between the two IPv6 addresses.

The address allocation method according to claim 1, wherein the address reservation option further includes an identity set identifier.

The address allocation method according to claim 1, wherein the address reservation option further includes a reservation period;

Determining whether the node corresponding to the assigned address is the same as the node corresponding to the reserved address And: determining, during the reservation period, whether the node that requires the address allocation is the same as the node corresponding to the reserved address;

The method further includes: deleting the IPv6 address corresponding to the IPv6 address information as a reserved address mark, and deleting the correspondence between the node and the reserved address.

The address allocation method according to claim 6, further comprising: receiving an update message sent by the node, where the update message includes the address reservation option;

The reservation period corresponding to the IPv6 address information included in the address reservation option is updated according to the update.

The address allocation method according to any one of claims 1 to 7, wherein the recording of the correspondence between the node and the reserved address is: recording media access control of the node Correspondence between the address and the reserved address, or a correspondence between the form of the combination of the medium access control address and the identity set identifier of the node and the reserved address.

The address allocation method according to any one of claims 1 to 7, wherein, in the case of supporting fast allocation, the address reservation option is carried in a request message, where the request message is included. Also carries a quick answer option;

The address reservation option sent by the receiving node includes: the receiving node sends the request packet carrying the address reservation option, where the request message is used to request the server to allocate an IPv6 address for the node.

The address allocation method according to any one of claims 1 to 7, wherein before the address reservation option sent by the receiving node, the method further comprises: receiving a request message sent by the node The request message is used to request the server to allocate an IPv6 address to the node;

The DHCPv6 server that is available in the network returns an advertisement message to the node, where the advertisement message is used to notify the node that an IPv6 address can be allocated to the node, and the node selects a DHCPV6 server according to the advertisement message;

The address reservation option sent by the receiving node is: receiving a request message sent by the node, where the address reservation option is carried in the request message.

The address allocation method according to any one of claims 1 to 7, wherein the node is a DHCPv6 client or a DHCPv6 proxy server.

12. An address allocation apparatus, comprising:

a first determining unit, configured to determine, when the address that is required to be allocated in the received address allocation option is the reserved address, whether the node corresponding to the reserved address is the same as the node corresponding to the reserved address;

13. The address distribution device according to claim 12, wherein:

The first replying unit is configured to return a reservation failure message to the node when the IPv6 address corresponding to the IPv6 address information does not exist.

14. The address distribution device according to claim 12, wherein:

The allocating unit is further configured to refuse to allocate the reserved address to the node that requests the address allocation when the node that requires the address allocation is different from the node corresponding to the reserved address.

15. The address distribution apparatus according to claim 12, wherein:

The address allocation device of claim 12, wherein the address reservation option further includes a reservation period;

The first determining unit is configured to determine, during the reservation period, whether the node corresponding to the allocated address is the same as the node corresponding to the reserved address;

The address allocation apparatus further includes: a second processing unit, configured to: after the expiration of the reservation period, cancel the IPv6 address corresponding to the IPv6 address information as a mark of the reserved address, and delete the node and the pre- The correspondence between the addresses is left.

The address distribution apparatus according to claim 16, further comprising: an update unit, configured to receive an update message sent by the node, where the update message includes the address reservation option, and according to The update message updates a reservation period corresponding to the IPv6 address information included in the address reservation option.

The address allocation device according to any one of claims 12 to 17, wherein the address reservation option is carried in a request message, and the request message further carries a quick response option;

The first receiving unit is configured to receive, by the receiving node, the request message carrying the address reservation option.

The address distribution device according to any one of claims 12 to 17, wherein the device further comprises:

a second receiving unit, configured to receive a request message sent by the node, where the request message is used to request to allocate an IPv6 address to the node;

An advertising unit, configured to return an advertisement message to the node, where the advertisement message is used to notify the node that an IPv6 address can be allocated to the node;

The first receiving unit is configured to receive a request message sent by the node, where the address reservation option is carried in the request message.