CN1437360A - Method for the point-to-point protocol log-on user to obtain Internet protocol address - Google Patents

Abstract

The invention relates to a method for users accessing the Internet through a point-to-point protocol to obtain an Internet Protocol address. The present invention provides a method for users accessing the Internet through PPP to obtain an Internet Protocol (IP) address through the Dynamic Host Configuration Protocol (DHCP). The relay module sends an internal message message for assigning an IP address request; the DHCP relay module simulates an IP address request message in DHCP format for the user based on the above message, and sends it to the DHCP server; The content of the message allocates an IP address and gives additional information about the address, and notifies the user of the IP address and the additional information through the DHCP relay module. The present invention can enable users surfing the Internet through PPP and users surfing the Internet through VLANs to obtain IP addresses through the DHCP server, facilitate unified management of IP address pools, and effectively prevent IP address conflicts from occurring.

Description

Method for obtaining Internet protocol address by users surfing the Internet through peer-to-peer protocol

technical field

The invention relates to a method for Internet users to obtain Internet Protocol (IP) addresses, in particular to a method for Internet users to obtain IP from a Dynamic Host Configuration Protocol (DHCP) server through Point-to-Point Protocol (PPP).

Background technique

At present, there are two ways to obtain an IP address for a user accessing the Internet through PPP: one is that the user is assigned an IP address by the access server after passing the authentication; Finally, the RADIUS server gives the user an IP address, or the RADIUS server specifies in the authentication passing message that the network access server allocates an IP address (NAS-Alloc-IP), and then the access server allocates an IP address for the user. The access server manages the IP address resource through the local IP address pool. If the IP address is allocated by the RADIUS server, the IP address resource is managed by the RADIUS server by configuring an address pool.

In order to facilitate the application, some current network access devices are set to allow PPP and virtual local area network (VLAN) access at the same time; users accessing the Internet through VLAN obtain IP addresses through DHCP, and the IP address pool is managed by the DHCP server; It can be seen from the above-mentioned prior art that users accessing the Internet through PPP do not obtain IP addresses through the Dynamic Host Configuration Protocol (DHCP), and the IP address pool that provides IP addresses for Internet users is not managed by the DHCP server; in this case Just make the IP address allocation of two different Internet users not carry out unified management, the hidden danger of IP address conflict then exists in the non-uniform management of IP address; Network service providers need unified management of network resources.

Contents of the invention

The purpose of the present invention is to provide a method for users accessing the Internet through the point-to-point protocol to obtain the Internet protocol address, so that the users accessing the Internet through the PPP can also obtain the IP address through the dynamic host configuration protocol.

The purpose of the present invention is achieved like this: the method that the user who gets online by the point-to-point protocol obtains the Internet protocol address comprises:

(1) The user who accesses the Internet through the PPP protocol, after passing the network authentication, sends an internal message message to assign an IP address request to the DHCP relay module by the system;

(2) The DHCP relay module simulates the IP address request message of the DHCP format for the user according to the above message, and sends it to the DHCP server;

(3) DHCP server distributes an IP address according to the received IP address request message content, and provides the additional message of this address, returns DHCP relay module with this IP address and additional message;

(4) The DHCP relay module sends the IP address and additional information to the system, and the DHCP relay module records the IP address assigned to the user simultaneously;

(5) The system encapsulates the above-mentioned IP address and additional information in the Internet Control Protocol (ipcp) phase message of PPP, and notifies users who access the Internet through PPP.

The IP address request message in DHCP format includes: Internet user port information and gateway address.

Described step (3) is to be finished by following process:

(31) The DHCP server distributes an IP address for the user according to the IP address request message sent by the DHCP relay module;

(32) above-mentioned IP address is sent to DHCP relay module, and DHCP relay module sends a DHCP message confirming this IP address to DHCP server according to this IP address;

(33) The DHCP server returns an acknowledgment (ACK) relay message to the DHCP relay module after receiving the above message, and the content of the message is the user's IP address and the additional information of the IP address.

The DHCP server manages IP addresses through an address pool, and the address pool includes multiple network segments, and the network segment handles are gateway IP addresses and masks.

The above-mentioned solution provided by the present invention can enable the user who accesses the Internet through PPP to obtain an IP address through the DHCP server, so that the users who use the same network access device to access the network through PPP and the users who access the Internet through VLAN can pass The DHCP server obtains the IP address, which facilitates the unified management of the IP address pool, realizes the unified allocation and recycling of IP addresses, and the centralized management of IP addresses effectively prevents the occurrence of IP address conflicts. Unified management and allocation of IP addresses can also provide more convenience for network service providers to manage network resources.

Description of drawings

Fig. 1 is the flow chart that the user who gets online through PPP obtains IP address from DHCP server;

Fig. 2 is a sequence diagram of a user accessing the Internet through PPP obtaining an IP address from a DHCP server.

Detailed ways

The specific embodiment of the method that the user who gets online through PPP that the present invention provides obtains IP address from DHCP server is described as follows:

Step 1: the user who surfs the Internet through PPP logs in to the network, and establishes a connection link with the PPP processing module. The PPP processing module is a functional module that completes the PPP protocol service in the network access server, and the user who surfs the Internet through PPP is called a PPP client;

Step 2: The PPP client sends an authentication request message to the PPP processing module, which carries information such as the user name and password of the user. The authentication request message is used for the user to request to pass the authentication and obtain an IP address to become an Internet user who can access the network. user;

Step 3: The PPP processing module sends the information such as the expected network segment of the user to the above-mentioned authentication request message and sends it to the authentication module of the access server. The authentication module is used to authenticate the user according to the user's information to determine whether the user is legal;

Step 4: After the authentication module passes the authentication, an internal message for assigning an IP address request is sent to the DHCP relay module, and the internal message includes information such as the network segment where the user is located;

The DHCP relay module is used to convert the message sent by the authentication module into a message conforming to the DHCP format, and is also responsible for converting the message returned by the DHCP server that needs to be sent to the user who accesses the Internet through PPP into a message in the format of the PPP client ;

Step 5: the DHCP relay module draws an IP address request message about the user's DHCP format according to the above-mentioned internal message module, and sends the message to the DHCP server, requesting the DHCP server to distribute an IP address for the user;

Step 6: The DHCP server responds to the above-mentioned message, allocates an IP address for the user from the address pool according to the network segment where the user is located, and returns the message carrying the IP address to the DHCP relay module. It is necessary to eliminate illegal and conflicting addresses in the corresponding network segment. If no suitable IP address is found to be assigned to the user, the user's request will be rejected;

The DHCP server can be an external server, and the DHCP relay module exchanges messages with it through the IP address of the DHCP server;

The DHCP server can also be a built-in server, and the DHCP relay module exchanges messages with it through the self-loop address 127.0.0.1 of the DHCP server;

The address pool of the DHCP server can include a plurality of network segments, and the network segment handle adds a mask for the gateway IP address or the routing IP address, or can only use the gateway IP address or the routing IP address as the network segment handle to request the DHCP server The IP address allocation message needs to point out the user's gateway IP address or routing IP address, so that the DHCP server can find the network segment corresponding to the user, and assign an IP address to the user in this network segment;

Step 7: After the DHCP relay module receives the message carrying the IP address, an IP address confirmation request message is returned to the DHCP server to confirm that the user accepts the IP address;

Step 8: After the DHCP server receives the IP address confirmation request message, it sends a message confirming that the IP address is assigned to the user to the DHCP relay module, and the message includes the IP address and the additional information of the IP address, such as The lease period of the IP address, domain name system and other information;

The lease period of the IP address defines the effective use time of the IP address. For users who access the Internet through PPP, the lease period of the IP address can be set to unlimited;

Step 9: The DHCP relay module sends the above-mentioned IP address and the additional message message to the authentication module of the access server. At the same time, the DHCP relay module records the IP address assigned to the user, and the user name, port information and IP address binding, so that the management system and management personnel can query and manage the allocation of IP addresses;

Step 10: the authentication module sends data information in IP formats such as authentication and IP address to the PPP processing module;

Step 11: the PPP processing module notifies the user of the message of passing the authentication;

Step 12: After receiving the authentication message, the user sends a request based on the Internet Control Protocol (ipcp) to the PPP processing module;

Step 13: The PPP processing module confirms the request, and encapsulates information such as the IP address and domain name system assigned to the user in an ipcp message to notify the user.

Similarly, Internet users need to release the IP address used in the process of accessing the network after the Internet user finishes surfing the Internet. The process of releasing the IP address is similar to the above process, and it is also realized by exchanging messages between the corresponding messages and the DHCP server by simulating the DHCP relay module. Release of IP address.

As can be seen from the above-mentioned specific embodiments of the present invention, it is possible for users to access the Internet through PPP to distribute IP addresses through the DHCP server, so that the management of IP addresses in network access devices that are allowed to access in PPP and VLAN modes can be unified , two types of network access users can dynamically share the same address pool, which facilitates the management of IP addresses.

Claims (4)

1. A method for obtaining an Internet protocol address by a user surfing the Internet through a point-to-point protocol, comprising: (1) The user who accesses the Internet through the PPP protocol, after passing the network authentication, sends an internal message message to assign an IP address request to the DHCP relay module by the system; (2) The DHCP relay module simulates the IP address request message of the DHCP format for the user according to the above message, and sends it to the DHCP server; (3) DHCP server distributes an IP address according to the received IP address request message content, and provides the additional message of this address, returns DHCP relay module with this IP address and additional message; (4) The DHCP relay module sends the IP address and additional information to the system, and the DHCP relay module records the IP address assigned to the user simultaneously; (5) The system encapsulates the above-mentioned IP address and additional information in the Internet Control Protocol (ipcp) phase message of PPP, and notifies users who access the Internet through PPP. 2. The method according to claim 1, wherein said IP address request message in DHCP format includes: Internet user port information and gateway address. 3. According to claim 1 or 2, the method for obtaining an Internet protocol address by a user accessing the Internet through a point-to-point protocol is characterized in that described step (3) is completed by the following process: (31) The DHCP server distributes an IP address for the user according to the IP address request message sent by the DHCP relay module; (32) above-mentioned IP address is sent to DHCP relay module, and DHCP relay module sends a DHCP message confirming this IP address to DHCP server according to this IP address; (33) The DHCP server returns an acknowledgment (ACK) relay message to the DHCP relay module after receiving the above message, and the content of the message is the user's IP address and the additional information of the IP address. 4. The method for obtaining an Internet protocol address by a user accessing the Internet through a point-to-point protocol according to claim 1, wherein said DHCP server manages IP addresses through an address pool, and the address pool includes a plurality of network segments, and the network segment handle is Gateway IP address and mask.

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