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Sunday, January 26, 2014

How to configure a NAT translation timeout ?

Dynamic Network Address Translation (NAT) creates entries in the table when a packet crosses from the inside NAT interface to the outside NAT interface, or the other way around. These entries have a default timeout value of 86400 seconds (24 hours), after which they are removed from the table if there is no activity for the duration of the timeout. Static NAT entries never time out and always remain in the table.

When using dynamic NAT, reducing the timeout value may be necessary when the duration of communication between the end-hosts is short, and a small pool of global addresses is used for translating a larger pool of local addresses. This allows the existing NAT entries to expire quickly so that the global addresses can be reused by the local addresses.
To modify the timeout value from the default, issue the ip nat translation timeout seconds |  never command from the global configuration mode. If NAT overloading is configured with dynamic translation, you can modify the timeout values on a protocol basis.

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