CN1585362A

CN1585362A - Method for direct processing user IP address through local DHCP-SERVER

Info

Publication number: CN1585362A
Application number: CN 200410009144
Authority: CN
Inventors: 张丽军
Original assignee: Harbour Networks Holdings Ltd
Current assignee: Harbour Networks Holdings Ltd
Priority date: 2004-05-28
Filing date: 2004-05-28
Publication date: 2005-02-23

Abstract

The method includes following steps: the DHCP-SERVER is set in DSLAM, the PPPoE for user's authentication is set up for DSLAM; after the user of DSLAM accesses the DSLAM and passes the authentication, an address request message is built and is sent to the above DHCP-SEVER, the above DHCP-SEVER receives the above request message, then decides if the address in address pool has the address, if yes, a available address is allocated to user and an address ACK message is built and is sent to DSLAM, if not, the address allocation is failure, an address NAK message is built and sent to above DSLAM.

Description

Method by the direct process user IP of local DHCP-SERVER address

Technical field

The present invention relates to the method for a kind of user's distributing IP address, relate in particular to a kind of method by the direct process user IP of local DHCP-SERVER address.

Background technology

Along with development of internet technology, broadband access has at present become a kind of leading user mode access.Broadband access generally comprises modes such as ADSL, VDSL, Ethernet, and according to the operation needs of operator, these all modes all need broadband dialing and the process that authenticates.After authentication phase is finished, also need to carry out IP address assignment usually, purpose is that like this, the end user just can communicate for user side distributes an IP.And present most of IP-DSLAM (Digital SubscriberLine Access Multiplexer) has been integrated into basic authentication (as 802.1x authentication, PPPoE authentication and termination) and IP address assignment and management function on the DSLAM equipment and has realized.Like this, higher level equipment just can substitute the BRAS of traditional application model with the three-tier switch of relative low price, thereby has reduced the construction cost of broadband access network significantly.

IP address assignment has multiple mode, mainly can be divided into two big classes: static IP distributes and dynamic IP is distributed; The static IP method of salary distribution is to specify an IP for user side in advance, after authentification of user passes through, just can communicate by letter at once; Do not have IP in advance and the dynamic IP method of salary distribution is a user side, after authentication is passed through,, obtain an IP, just can communicate by letter then by the IP address assignment process.For the dynamic IP method of salary distribution, modal is to utilize DHCP (Dynamic Host ConfigurationProtocol) agreement, and IP-DSLAM is IP address of user side dynamic assignment; When user side initiatively disconnected connection or abnormal broken line, IP-DSLAM can reclaim this IP, so that can be that other clients are distributed.DHCP is the expansion of BOOTP, is based on C/S model, and it provides the mechanism of a kind of dynamic assigned ip address and configuration parameter, and this is mainly used in the relatively place of difficulty of large network environment and configuration.DHCP has defined a kind of mechanism that can make the IP address use one section finite time, client's time limit in can redistribute this IP address.Dynamic Host Configuration Protocol server is client computer assigned ip address automatically, and its configuration parameter makes the compunication on the network become convenient and realized easily.DHCP can rent the IP address, and for the catenet that has many computers, it sometimes may be unnecessary that every computer has an IP address.Rental period is indefinite from 1 minute to 100 years, when the rental period to the time, server can use to this IP address assignment other machine.The client also can ask to use the network address and the corresponding configuration parameters of oneself liking.

DHCP-SERVER is based on the DHCP agreement, and the process IP application IP addresses are based on the message driving mechanism, and the basic process of process IP application IP addresses is as follows: (1) receives certain user's DHCP-DISCOVER message; (2) judge whether this locality has IP to distribute; If find assignable IP, reply a DHCP-OFFER message; (3) receive user's DHCP-REQUEST message; (4) judge whether to distribute to the user,, reply a DHCP-ACK message as distributing; Then reply a DHCP-NAK as distributing.This shows that the IP assigning process of a success needs the mutual of four DHCP messages.The direct decline that this has caused the SERVER disposal ability causes bandwidth to reduce.

Summary of the invention

Connect the existing problem and shortage of user applies IP address approach at existing DSLAM, the present invention proposes a kind of method by the direct process user IP of local DHCP-SERVER address.

The present invention is achieved in that a kind of method by the direct process user IP of local DHCP-SERVER address, may further comprise the steps:

For in the DSLAM equipment DHCP-SERVER being set, be used for the PPPoE termination of authentification of user simultaneously for the DSLAM equipment disposition;

The user of DSLAM inserts described DSLAM and by after the authentication, begins to construct an address request, sends to described DHCP-SERVER;

After described DHCP-SERVER receives described request message, judge whether the address has the address in the address pool,, directly distribute to available address of user, and construct an address ACK message, send to described DSLAM if having; If do not have or the address assignment failure, then construct an address NAK message, send to described DSLAM.

Further, this method also comprises: DSLAM detects user offline or unusual the pressure rolled off the production line, and initiatively sends the address release message to DHCP-SERVER, and described DHCP-SERVER discharges this user's IP address after receiving the address release message.

Further, described address pool is a local pool.

The present invention is by configuration DHCP-SERVER in DSLAM and PPPoE termination.Here, the PPPoE termination is that the PPPoE message can terminate in this locality, and is corresponding with transparent transmission.Local DHCP-SERVER has been increased support and processing to PPPoE Address requests message, can analyze this request message, information extraction directly distributes an IP available then; Increased the ability of structure PPPoE address success with the message of failure, can be by sending the mode and the PPPoE module direct dialogue of message, make that the PPPoE user who is connected with DSLAM can be directly to DHCP-SERVER application and release address, with the application of IP address by in transferring to outward, reduce the application processing time, improved bandwidth.

Description of drawings

Below in conjunction with accompanying drawing, the present invention is made detailed description.

Fig. 1 is an application structure schematic diagram of the present invention.

Embodiment

As shown in Figure 1, application structure of the present invention is as figure, wherein: A:Radius Server server; B:Internet; C:L3 Switch is used to converge L2 Switch; D:L2 Switch; E:IP-DSLAM; F: user.And finish distribution to IP address by the built-in DHCP-SERVER of IP-DSLAM.

The present invention at first is DSLAM configuration DHCP-SERVER, being PPPoE user's distributing IP address of access by built-in DHCP-SERVER, but makes the application IP addresses inter-process.But behind the built-in DHCP-SERVER of DSLAM equipment, but run into a problem, that is exactly that PPPoE user at first will pass through the LCP stage, authentication is passed through then, enter ncp stage, application IP address, but because an IP is directly returned in the common requirement of PPPoE user, itself is the processing and the ability to accept of DHCP message not, causes directly carrying out with local DHCP-SERVER the message interaction of application IP addresses.Be the authentication of DSLAM configuration PPPoE termination again, and PPPoE and DHCP-SERVER are processed the expansion of ability, can handle the Address requests and the release message of same format.

After the PPPoE user who is connected with DSLAM starts, send authentication request to DSLAM, PPPoE termination authentication module in the DSLAM is handled PPPoE user's authentication request, authentification of user by and enter the NCP address negotiation stage after, construct an address request, comprise the recommended value of session identification and applied address and the configuration parameter of PPPoE, send to the DHCP-SERVER module.

Because DHCP-SERVER handles this special address request, according to local pool, if can distribute the address to give the user, directly distribute an IP available address, and construct an address ACK message, the session identification that comprises the IP of distribution and necessary configuration parameter, PPPoE sends to the PPPoE processing module of DSLAM; As distributing or distribute failure, construct an address NAK message, comprise the session identification of PPPoE, send to the PPPoE processing module.

The PPPoE processing module is received the address ACK message of the session identification of corresponding PPPoE, and ncp stage finishes, and can IP be set for the PPPoE user side, and the user just can normally surf the Net; Receive address NAK message, return failure result, and the notice user side.

When PPPoE user is normally rolled off the production line or detected unusual pressure and roll off the production line, initiatively send the address release message to DHCP-SERVER, comprising the session identification of IP address information and PPPoE.DHCP-SERVER handles this address release message, discharges this IP address, and this IP address just can be distributed to other user and use.

Claims

1, a kind of method by the direct process user IP of local DHCP-SERVER address may further comprise the steps:

2, the method by the direct process user IP of local DHCP-SERVER address as claimed in claim 1, it is characterized in that, this method also comprises: DSLAM detects user offline or unusual the pressure rolled off the production line, initiatively send the address release message to DHCP-SERVER, described DHCP-SERVER discharges this user's IP address after receiving the address release message.

3, the method by the direct process user IP of local DHCP-SERVER address as claimed in claim 1 or 2 is characterized in that, described address pool is a local pool.