We all know that NAT is a essential yet basic tool. But when I spoke with some network engineers they were not able to clearly explain the concept of Hits & Misses in the show ip nat statistics output. So if you are new to nat let me help you out.
If the active translation is for the active mapping or translation present in the nat cause hit , in other words -- hits to an existing mapping.
Misses indicate a new mapping or something that was there in the nat table but has expired & hence causing a new mapping in the NAT table, in other words -- misses causing an attempt to create a mapping, and expired translations.
I am not putting up any configs as a wonderful example & explanation is put up in the following blog http://cciepursuit.wordpress.com/2007/10/07/hits-and-misses-in-ip-nat-statistics/
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