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Old 08-11-2011, 01:22 AM
eduardo eduardo is offline
Junior Member
Join Date: Jul 2010
Location: Costa Rica
Posts: 12
Default Help with NAT overload (PAT)

Dear Collegues:

As a practice I have created a topology in which I am trying to run NAT from RA. The purpose is to translate subnet IPs and into the serial 0/3/0 ip address into the serial 0/3/0 IP which is When I ping host AP (ip address from host PC Call Center 2 (ip address it is 100 % reachable. When I check the translations in RA I see that the translation is fine:

RA#show ip nat translation
Pro Inside global Inside local Outside local Outside global

However when I check the statistics it shows me the following results:

RA# sho ip nat statistics
Total translations: 51 (0 static, 51 dynamic, 51 extended)
Outside Interfaces: Serial0/3/0
Inside Interfaces: FastEthernet0/0.2 , FastEthernet0/0.3
Hits: 2513 Misses: 3355
Expired translations: 3271
Dynamic mappings:

And the counter of hits , misses and expired translations they are increasing progresively with every packet I sent from the source to the destination. My questions:

1) Is my NAT properly configured ?
2) Does anyone knows the posibles causes of why the expiration translation counter might increase in a router ?

Here I show my nat configuration:

ip nat inside source list 1 interface Serial0/3/0 overload
access-list 1 permit
access-list 1 permit
interface Serial0/3/0
ip address
ip nat outside
interface FastEthernet0/0.2
encapsulation dot1Q 2
ip address
ip nat inside
interface FastEthernet0/0.3
encapsulation dot1Q 3
ip address
ip nat inside

For further information feel free to check the attached PKA file.

Greetings and thanks ,
Attached Files
File Type: zip practica (27.6 KB, 1 views)
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