Sep 09,2009 00:00
Some dynamic translations stay in the translation table for 24 hours. Clearing dynamic NAT translations from the translation table before they timeout is possible by using the clear ip nat translation * command. This is particularly useful when testing NAT configuration.
Static NAT entries are immediately reestablished in the table.
Additional options exist for clearing only part of the table. Use the clear ip nat translation ? feature, if necessary.
Changing the NAT Default Inactivity Timeout Timers
TCP translations inactivity timeout defaults to 24 hours, unless an RST or FIN bit packet is seen on the stream, in which case they timeout in one minute. To change the amount of time after which NAT translations timeout, use the global configuration ip nat translation command. To disable the timeout, use the no form of this command.
The following example demonstrates changing the NAT default timeout value to 120 seconds on Rtr1.
Additional timer options are covered in the overload (PAT) section.