NAT Translation Misses Counter

The "Misses" counter in Cisco's Network Address Translation (NAT) appears as part of the output of the show ip nat statistics command, refers to the number of times the software performs a lookup in the translations table and fails to find an entry. When a miss occurs, the system attempts to create a new entry, resulting in the allocation of an IP address from the NAT pool. It is crucial to note that a miss is not defined by a failed attempt to allocate an IP address from the NAT pool, but rather the lack of an existing match in the translations table, which leads to the allocation attempt.

An example of the output of this command can be seen here:

NAT#show ip nat statistics 
Total active translations: 0 (0 static, 0 dynamic; 0 extended)
Outside interfaces:
  FastEthernet0/0
Inside interfaces: 
  FastEthernet1/0
Hits: 5  Misses: 0
CEF Translated packets: 0, CEF Punted packets: 0
Expired translations: 1
Dynamic mappings:
-- Inside Source
[Id: 1] access-list 1 interface FastEthernet1/0 refcount 0
Queued Packets: 0

https://networklessons.com/ip-services/troubleshooting-nat-pat