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Method for responding requests from address analysis protocol of network address conversion virtual address

A virtual address and address technology, applied in the direction of data exchange through path configuration, can solve the problems of address translation failure, address translation and data forwarding failure, and NAT routers failing to receive response packets, saving system resources and reducing Effective time effect

Inactive Publication Date: 2006-12-27
SHENZHEN HUAWEI TECHNOLOGIES SOFTWARE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the host server on the external network, the ARP request does not respond, and the MAC address corresponding to the IP address 20.1.1.2 cannot be obtained, so the response message cannot be sent out, resulting in the failure of address translation and data forwarding through NAT
[0011] When using NAT for address translation, if the translated IP address configured by the user belongs to the same network segment as the interface address of the router, the reply message will not find the MAC address corresponding to the destination IP address due to the failure of the ARP request. The NAT router fails to receive the reply packet, and the address translation fails

Method used

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  • Method for responding requests from address analysis protocol of network address conversion virtual address
  • Method for responding requests from address analysis protocol of network address conversion virtual address
  • Method for responding requests from address analysis protocol of network address conversion virtual address

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Embodiment Construction

[0029] When NAT performs address conversion and establishes a new communication link, the present invention checks whether the IP address after the current conversion is in the same network segment as the IP address of the outgoing interface of the NAT router. Register the response to the ARP request of the virtual IP address. After registration, the interface will respond to the ARP request of the IP address with its own MAC address. When this communication link is closed, unregister the address in response to ARP requests on this interface. Specifically: check whether the NAT-translated address is in the same network segment as an interface IP address in the router, if yes, check whether the virtual address is registered in the router link table, if it has been registered, after the new link is established, the The virtual address counts the link; if it is not registered, the virtual address is registered on the interface of the same network segment, and the link count of th...

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Abstract

The invention discloses a method for responding ARP request to NAT virtual address which comprises, examining whether NAT transformed address and certain interface IP address in the router are in the same network segment, if so, searching whether the virtual address is registered in the chained list, then performing linkage counting to the virtual address, or registering the virtual address to the interface of the same network section, finally initializing the linkage numbering of the virtual address to 1.

Description

Technical field: [0001] The invention relates to a method for responding to the ARP request of the NAT virtual address. Background technique: [0002] NAT (Network Address Translator, Network Address Translation) is used to allow multiple PCs on a private network (using a private address range, such as 10.0.x.x, 192.168.x.x, 172.x.x.x) to share a single, globally routable IPv4 (address Version 4) address of the conversion protocol, that is, NAT can use the same IPv4 address in multiple internet subnets, ensuring that a limited number of IPv4 addresses are used by as many users as possible, and NAT also supports translation of external source addresses. It receives the data packet returned from the outside, and then translates the address into an internal local IP according to the NAT table, and forwards the data packet; NAT also supports load balancing of internal servers and other related applications. [0003] Such as figure 1 For the case of using NAT to access the exte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/28
Inventor 张持岸
Owner SHENZHEN HUAWEI TECHNOLOGIES SOFTWARE CO LTD
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