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Method and device for forwarding messages and network equipment

A message forwarding and message technology, applied in the field of network data communication, can solve problems such as the inability to reach the DHCP server and the inability of PC_B to be assigned an IP.

Active Publication Date: 2010-09-15
BEIJING XINWANG RUIJIE NETWORK TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0021] In this way, PKT_2 is equivalent to being blocked by the firewall and cannot reach the DHCP server in the subnet Net_A, causing PC_B to be unable to assign IP

Method used

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  • Method and device for forwarding messages and network equipment
  • Method and device for forwarding messages and network equipment
  • Method and device for forwarding messages and network equipment

Examples

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Embodiment Construction

[0040]The specific implementation manners of a message forwarding method, device and network equipment provided by the present invention will be described in detail below with reference to the accompanying drawings.

[0041] The message forwarding method provided by the embodiment of the present invention, such as figure 1 shown, including the following steps:

[0042] S101. Determine the first interface through which the firewall receives the message;

[0043] S102. The firewall extracts 5-tuple information from the received message.

[0044] S103, the firewall matches the quintuple information with the quintuple information of the flow record in the flow table; if the match is successful, perform step S104; if the match is unsuccessful, perform step S108;

[0045] S104, the firewall further compares whether the first interface of the firewall receiving the message is consistent with the receiving interface of the message initiator in the matching first flow record, if they...

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PUM

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Abstract

The invention discloses method and device for forwarding messages and network equipment. The method comprises steps of: confirming a first interface for receiving the message; extracting five tuple information from the received message; matching the five tuple information with five tuple information of a flow record in a flow list; if the matching is successful, comparing if the first interface is consistent with a receiving interface corresponding to a message initiator in a matched first flow record, and if so, forwarding the message from a sending interface corresponding to the response end of the first flow record, if not so, creating a second flow record in the flow list and using a second interface formed by the first interface in a bridge set way in the second flow record as a sending window corresponding to the message response end; and forwarding the message from the second interface. The invention realizes that a transparent mode fire wall correctly forwards messages received from two interfaces forming a bridge set and provided with same five tuple information.

Description

technical field [0001] The invention relates to the field of network data communication, in particular to a message forwarding method, device and network equipment. Background technique [0002] The packet filtering function of the firewall does not just target a single packet and allow or prevent it from passing according to the rules; legality of the text. [0003] Firewalls generally use "flow" to record the context of the data interaction process. [0004] Take a Transmission Control Protocol (Transmission Control Protocol, TCP) message as an example: a synchronization (SYN, synchronize) message is the start of a data exchange, and the firewall creates a flow record after receiving the SYN message. In this case, only the responder of the SYN message is allowed to respond to a SYNACK message, or the initiator of the SYN message resends the SYN message; Asynchronous acknowledgment (SYNACK) messages at the message response end are considered illegal. If the firewall rec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/56H04L29/06H04L45/74
Inventor 黄凯明
Owner BEIJING XINWANG RUIJIE NETWORK TECH CO LTD
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