Method and device for network address translation

Abstract

The invention relates to the technical field of communications and discloses a method and a device for network address translation. The method comprises the steps as follows: receiving a message in a data connection; judging whether a message exit in the data connection is changed or not; performing address translation to the received message according to the addresses before and after translating in translation information while the message exit in the data connection is not changed; performing rule matching to the received message while the message exit in the data connection is changed and re-determining the translated address of the message, and performing the address translation to the received message by using the determined translated address and transmitting the message whose address is translated. The method and the device of the invention could ensure the address used by the message is the address provided by an operator corresponding to a forwarding exit so as to ensure that the message will not be discarded because the message does not pass test of an original address of an operator server to solve the problem that the message is blocked or unable to access because the message is discarded.

Description

technical field [0001] The present invention relates to the technical field of communication, in particular to a method and device for network address translation (NAT). Background technique [0002] NAT (Network Address Translation, Network Address Translation), also known as network masking or IP masking (IPmasquerading), is a technology that modifies the source IP address or destination IP address after an IP packet passes through the gateway egress device. When the private network accesses the public network or provides services in the private network in the form of public network services, the communication between the public network and the private network can be realized through NAT technology, and the private network equipment can not be exposed. Moreover, in the NAT technology, using a small number of public IP addresses to represent more private IP addresses can solve the problem of exhaustion of available IP address space. [0003] In the prior art, the gateway e...

AI Technical Summary

Problems solved by technology

In this way, the network address used by the message is inconsistent with the network address assigned by the operator

In this way, when the operator has source address detection, it will cause network jams or congestion; if the operator does not have source address detection, the ports used for sending packets and replying packets are inconsistent, which will affect the performance of load balancing. Effect

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