old NAT translations in 1811 failover setup

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Sep 12th, 2008
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I have a 1811 setup to failover from one static route( a cable modem connection) to another static route( a dsl connection) using tracks and SLA. That part works fine the cable modem route fails and the default route for internet traffic switches to the dsl modem.

the problem is that once the switch happens "sh ip nat trans" shows translations still pointing to the down conenction. users still accessing sites using those translations do not have access, however new translations (visiting a site they havent visted before) use the backup DSL line and everything works.

Do you guys have any suggesstions on how to get the translations to expire for routes throught a connection deemed to be down via SLA and Track???

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JORGE RODRIGUEZ Fri, 09/12/2008 - 14:28
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You may need to configure rate limiting nat translations, once your ISP1 is down and ISP2 kicks in nat translations are still bound to ISP1.

When you have a chance to do a test, "show ip nat translation " after you go over the link bellow , and try something like:

ip nat translation timeout 2

ip nat translation icmp-timeout 2

ip nat translation tcp-timeout 2

ip nat translation udp-timeout 2

see ip nat translation (timeout)


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