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What causes NAT misses?

What are the possible/likely causes of NAT misses? I can read the documentation definition that tells me what a miss is, but cannot find any information on what specific circumstances may lead to a miss. I'm troubleshooting a problem where the NAT overload for one set of users seems to regularly stop working--the problem is temporarily cleared when the NAT translations are cleared, but then recurs within a day or so--and one thing we've noticed is that the NAT misses seem to increment rapidly for this particular group of users, but not for any others.

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Anonymous
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Re: What causes NAT misses?

misses are normal and not indicating any problem.

A miss indicates there is no nat translation available

for this ip packet so one needs to be created.

It's like a cache miss.

If no cache entry exist - you need to create one.

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