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FAQ - What Are Generation Mechanisms of NAT Logs on CGNs in the IPv6 NAT444 Solution

Publication Date:  2013-09-22 Views:  68 Downloads:  0
Issue Description
In Huawei IPV6 NAT444 solution, it is recommended that ports be allocated to NAT private network addresses based on port blocks because the number of default session-based NAT logs is much greater than port block-based NAT logs. Why?
Handling Process
Root Cause

A CGN device generates NAT logs according to the following mechanisms:

1. Based on the session NAT 5-tuple (source IP address, sink IP address, source port, sink port, and protocol ID), a NAT log is generated upon a change of the source or sink port even if the sink and source IP addresses do not change. As result, a large number of NAT logs may be generated.

2. Based on port blocks, only one NAT session log is generated if the source port varies within the pre-allocated port blocks when the source IP address, source IP address, sink port, and protocol ID do not change.
The port block-based log generation scheme dramatically reduce the number of NAT session logs, reliving pressing on the log server and facilitating maintenance and fault diagnosis. Therefore, it is recommended by Huawei.