cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
815
Views
4
Helpful
3
Replies

NAT entry disappears !

nicolasvibert
Level 1
Level 1

Hello,

Our customer has a really weird issue:

when he configures a few Static NAT entries, one of them will always disappear from its running-config after a few hours, but not from the startup-config.

It's always the same entry that disappears (the one with the address : A.B.218.90.)

His configuration is as follow:

ip nat inside source list 1 pool nat-internet overload

ip nat inside source static 10.32.100.50 A.B.218.81

ip nat inside source static 172.16.1.12 A.B.218.82

ip nat inside source static 172.16.1.9 A.B.218.83

ip nat inside source static 172.16.1.7 A.B.218.84

ip nat inside source static 172.16.1.6 A.B.218.85

ip nat inside source static 172.16.1.3 A.B.218.88

ip nat inside source static 172.16.1.2 A.B.218.90

ip nat inside source static 192.168.2.222 A.B.218.91

ip nat inside source static 172.16.1.4 A.B.218.92

ip nat inside source static 172.16.1.11 A.B.218.94

All the others have similar configuration in his running-config, but it's the only one that disappears.

Any ideas?

Thanks,

Nicolas

3 Replies 3

Hello Nicolas,

is the IP address 172.16.1.2 part of access list 1 ?

Which IOS version are you running ?

Regards,

GP

Hi,

The IOS version is 12.3(8)T8.

Yes, 172.16.1.2 is part of access-list 1.

Regards,

Nicolas

Hello Nicolas,

I think that might be the problem, the IP address being part of a dynamic pool, and at the same time having a static entry for the address. Try and configure access list 1 so that the IP address is not included, and check if that makes a difference.

Regards,

GP