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The translations in the: "show ip nat translations" table exists only when"
When there is NO traffic flowing on the device which is using a specific translation
When there is traffic flow on the router which is using a specific translation
When there is traffic flow between vlans which is using a specific translation
None of these, all translations remain until either the device is rebooted, or the previous translation is replaced by a new nat-assignment to a different nat-client
NAT and NAT overloading is only tracked in translation table when the traffic flows through the router in which NAT is configured. - - - - - the translations in the table have specific lifetimes, and then age out of the translation table. Realize that there is a different translation for each ping, web-page, telnet-session, dns-request, you do. Each one of those items usually has a different random/ephemeral source-port when it leave your computer, so that the returning traffic can be sent to the correct upper-layer connection-points. Also, things like pings, and dns-requests have very short lifetimes so that they clear out quickly, and free up memory.
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