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Address resolution protocol arp request message response method and device

A technology of address resolution protocol and ARP request, applied in the field of address resolution protocol ARP request message response

Active Publication Date: 2022-06-21
NEW H3C SECURITY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] However, if the destination IP address carried in the ARP request message is different from the IP address of the NAT ingress interface of the NAT device, and the destination IP address is in the same network segment as the IP address of the NAT ingress interface of the NAT device, then the ARP request messages will only be broadcast on the local network and will not be forwarded at Layer 3

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  • Address resolution protocol arp request message response method and device
  • Address resolution protocol arp request message response method and device
  • Address resolution protocol arp request message response method and device

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Embodiment Construction

[0029] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0030] in as figure 1The shown networking includes an intranet server 101 , a NAT device 102 and an extranet terminal 103 . The intranet server 101 is used to provide resources to the external network terminal 103 to access, such as DNS (Domain Name System, Domain Name System) service, HTTP (Hyper Text Transport Protocol, Hyper Text Transport Protocol) service, FTP (File Transfer Protocol, File Transfer Protocol) service etc. The NA...

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Abstract

The embodiment of the present invention provides an address resolution protocol ARP request message response method and device, wherein the NAT device receives the ARP request message carrying the IP address for accessing the second network device sent by the first network device of the first network, Determine whether the IP address used to access the second network device matches the preset address translation policy, and whether the IP address used to access the second network device is on the same network segment as the IP address of the NAT inbound interface of the NAT device. If the policy is converted and it is on the same network segment, read the MAC address of the NAT incoming interface, and send an ARP response message carrying the MAC address of the NAT incoming interface to the first network device. When the NAT device does not respond to the ARP request message, it actively reads the MAC address of the NAT ingress interface, and sends an ARP response message carrying the MAC address to the first network device, realizing the ARP request sent to the first network device The response of the message, thus ensuring the normal communication between network devices under the NAT network.

Description

technical field [0001] The present invention relates to the field of communication technologies, and in particular, to a method and device for responding to an address resolution protocol ARP request message. Background technique [0002] A NAT (Network Address Translation) device in a network can translate an IP (Internet Protocol, Internet Protocol) address into another IP address, and by translating the IP address of one network into the IP address of another network, the The purpose of mutual access between two different networks. [0003] It is well known that two networks communicate based on IP addresses, while each network device in a single network communicates based on MAC (Media Access Control) addresses. For example, if network device 1 located in network 1 wants to communicate with network device 2 located in network 2, the communication process is: network device 1 searches the local ARP cache table for the IP address and MAC address of network device 2, If n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L61/103H04L61/2503H04L61/2557H04L101/622
CPCH04L61/103H04L61/2503H04L61/2557H04L2101/622
Inventor 张晓红
Owner NEW H3C SECURITY TECH CO LTD