Strange NAT behavior on 2821 router

Unanswered Question
Feb 27th, 2009

Hi all,

I did the following to remove a "ip nat inside source static ...." entry on my 2821 router, but with no luck !

- turn off nat (no ip nat outside, no ip nat inside)

- clear ip nat trans forced

- no ip nat inside source static .....

The entry is not deleted and is still there when i do a "sh ip nat translations".

What bothers me is the result of "sh ip nat stat"

Total active translations: 4294967273 (4294967293 static, 4294967276 dynamic; 4294967276 extended)

Outside interfaces:

Inside interfaces:

Hits: 81 Misses: 11

CEF Translated packets: 92, CEF Punted packets: 0

Expired translations: 10

Dynamic mappings:

Queued Packets: 0

The Total Active Translations is way too high, despite NAT being turned off.

Any suggestions on how this can happen?

My router is an 2821 with IOS 12.4(11)XJ4


I have this problem too.
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Paolo Bevilacqua Fri, 02/27/2009 - 11:20

These are "normal" bugs in IOS. Reboot the router, or live with that. Of course the huge number is not real, actually an unsigned underflow.


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