Help required to indentify the NAT drops

[c.tabassum]

Hi All,

I have a NAT setup. Some of my udp packets are dropping. How to find more about the NAT to find whether it missed anything or not. the router is 3945e.

1000#sh ip nat statistics

Total active translations: 1392 (17 static, 1375 dynamic; 1375 extended)

Peak translations: 3839, occurred 1d19h ago

Outside interfaces:

  GigabitEthernet0/1

Inside interfaces:

  GigabitEthernet0/0

Hits: 232411493  Misses: 0

CEF Translated packets: 112178990, CEF Punted packets: 5643880

Expired translations: 61476

Dynamic mappings:

-- Inside Source

[Id: 1] access-list 110 interface Loopback0 refcount 2110

Total doors: 737

Appl doors: 0

Normal doors: 737

Queued Packets: 0

[cadet alain]

Hi,

the misses are packets that had no active translation slot in the NAT table, these are not the packets dropped or not natted.

Regards.

Alain

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[c.tabassum]

Is there any cli commands to investage the NAT drops or missed translations?

[johnlloyd_13]

Hi,

You can use 'debug ip nat' to dig deeper on your troubleshooting. Just be careful when issuing this command on a peak production hours.

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