A method and communication device for processing address parsing protocol packet

Abstract

A communication device, which is used for processing an address resolution protocol ARP message, comprises a CPU and an ARP message processing module. An ARP message processing method by using the device comprises that a. if the ARP message processing module judges the received data frame type is an ARP request message, b is executed; if the received data frame type is an ARP response message, d is executed; b. if an objective gateway MAC address corresponding to an objective IP address in the data frame is found in a gateway ARP table, which is set in the module, c is executed; c. the ARP response message is assembled and is sent out after the assembly, thus the process is concluded; d. if the module judges an objective MAC address in the data frame is the MAC address of the gateway, theexistence of the same ARP information is looked up in the gateway ARP table after the compositions of the ARP information by a source IP address and a source MAC address in the data frame, if the ARPinformation are the same, thus the process is concluded. With the invention, the ARP message processing efficiency is improved.

Description

technical field [0001] The invention relates to the Ethernet communication technology, in particular to a method and a communication device for processing address resolution protocol messages. Background technique [0002] With the rapid development of the Internet, the Ethernet network has gradually become an indispensable tool in people's daily work and life. Ethernet switches or routers are indispensable communication devices for forming an Ethernet network, and the number of them in the network is increasing day by day. At the same time, IP data packets are often sent through Ethernet, but Ethernet communication devices do not recognize 32-bit IP addresses, and they transmit Ethernet data packets with 48-bit large network addresses. Therefore, the IP driver must translate the IP destination address into a 48-bit Ethernet destination address. There is some sort of static or algorithmic mapping between these two addresses, and it is often necessary to look at a table to ...

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Problems solved by technology

[0004] Furthermore, there are many kinds of viruses on the network, and one of the ARP viruses keeps forging various ARP protocol messages to send to the network or Ethernet communication devices, or users maliciously or unintentionally send a large number of ARP protocol packets. These protocol messages will occupy a large amount of processing time of the CPU in the Ethernet communication equipment, causing the Ethernet communication equipment to fail to process other important protocols or control messages in a timely manner, resulting in network failures with serious consequences

These illegal ARP packets are exactly the same as normal ARP packets and cannot be distinguished. Therefore, the only way to solve this problem is to improve the processing ability of the ARP protocol packets of the Ethernet communication equipment under the premise of reducing the cost as much as possible.

But there is no related technology in the prior art to solve this problem

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