Port mapping method and device and communication system

Abstract

The embodiment of the invention discloses a port mapping method and device and a communication system. The method comprises the following steps: obtaining static port mapping information comprising a congruent relationship among a public network port number, a DHCP (Dynamic Host Configuration Protocol) client side identification and a private network port number; obtaining the congruent relationship between the DHCP client side identification and the IP address of the private network as well as the IP (Internet Protocol) address of the public network of an NAT (Network Address Translation) gateway; and according to the congruent relationship among the obtained IP address of the public network of the NAT gateway, the DHCP client side identification and the IP address of the private address as well as the static port mapping information, building the port mapping relationship. According to the embodiment of the invention, manual configuration operation in the port mapping relationship can be carried out without waiting for the ending of the process of dynamically distributing the IP address of the private network, manual configuration workload and configuration error or repeated probability can be reduced, and manual configuration operation does not need to be carried out again after the IP address of the private network is changed.

Description

technical field [0001] The invention relates to communication technology, in particular to a port mapping method, device and communication system. Background technique [0002] The header of the IP data packet transmitted based on the Internet Protocol (Internet Protocol, hereinafter referred to as IP) includes a source IP address and a destination IP address. When an IP data packet passes through a router or a firewall, the technology of rewriting the source IP address or / and destination IP address in the header of the IP data packet is called Network Address Translation (NAT for short). Currently, the NAT technology is commonly used in a private network where multiple hosts access the Internet (Internet) through a public network IP address. For example: a home network including multiple personal computers (Personal Computer, hereinafter referred to as: PC) forms a private network, if the operator only allocates one public network IP address for the home network, and all P...

AI Technical Summary

Problems solved by technology

[0008] When configuring a static private network IP address, the configuration personnel need to manually configure various network information on the private network device, including: static IP address, subnet mask, default gateway IP address, preferred domain name server (Domain Name Server, hereinafter referred to as: DNS) and the IP address of the backup DNS, etc., the configuration workload is relatively large, especially when there are many private network devices in the private network, it needs to occupy a large amount of human resources and working time, and the configuration efficiency is low; When the private network device is configured with a static private network IP address, configuration errors or duplication are prone to occur, resulting in faults such as IP address errors, IP address conflicts, communication service connections to the public network, etc., and communication services cannot be performed normally. It is necessary to check all kinds of configured network information one by one, especially when there are many private network devices in the private network, the workload is heavy, and it also needs to occupy more human resources and working time, thus affecting the normal communication business

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