Allocation method and system for network address conversion port resource under distributed architecture

Abstract

The invention provides a network address translation (NAT) port resource allocation method under a distribution structure, which is applicable to a distribution environment comprising a main control board and more than one business boards. The method comprises the steps that the main control board manages the NAT port resource uniformly and each business board requests the main control board for the port resource according to the NAT business volume of the business boards; the main control board allocates disengaged port resource for the business boards according to the requests of the business boards, and then the business boards carry out NAT by using the allocated port resource. Correspondingly, the invention also provides an allocation system of NAT port resource under the distribution structure. By adopting the technical proposal provided by the invention, the utilization rate of the NAT port resource can be improved.

Description

technical field [0001] The invention relates to network communication technology, in particular to a network address translation (NAT, Network Address Translation) port resource allocation method and system under a distributed architecture. Background technique [0002] NAT is a technology for converting an IP address in an Internet Protocol (IP, Internet Protoc0l) datagram header to another IP address, and is mainly used to realize the function of a private network accessing a public network. A variant of NAT is Network Address Port Translation (NAPT). NAPT allows multiple private network addresses to be mapped to different ports of the same public network address, so that multiple private network terminals can share the same public network address. This helps to alleviate the problem of shortage of public network address resources. figure 1 It shows a schematic diagram of NAPT application. When two messages sent by different private network terminals 192.168.1.2 and 192.1...

AI Technical Summary

Problems solved by technology

[0006] Although the above solution of statically configuring port resources can solve the problem of port resource allocation conflicts, due to the uneven distribution of traffic on the interface board, it is likely that a certain service board has used up the allocated port resources due to a large number of service flows. A large number of port resources are left unused on the other service board due to less service flow

In this case, when a new service flow arrives at the service board whose port resources have been used up, the packet processing will fail due to port allocation failure, and eventually the packet will be discarded. Plenty of port resources are still available on board

It can be seen that using the method of statically configuring port resources may easily cause the whole machine to fail to process services normally when it is far from the maximum specification, resulting in waste of port resources.

In addition, because the port resources on each service board are statically configured, when one of the service boards fails or is not in place, the port resources on this service board cannot be used by other service boards. Will cause waste of port resources

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