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Posted by News Reader on July 30, 2008, 6:04 pm
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Jon.R.Kibler@gmail.com wrote:
> Hi,
>
> A question about port-timeout: Which port does this refer to, the
> inside or outside port.
>
> For example:
> ip nat translation port-timeout udp 123 30
>
> Is this the 123/udp on the inside or outside network?
>
> THANKS!
> Jon K
Opinion:
I suspect that it would influence any translation referencing the port
number (inside global, inside local, outside local, outside global).
Consider HTTP translations rather than NTP, because the client and
server ports would differ with HTTP.
Compare a translation for an outbound connection to an Internet-based
Web server, and another translation for an inbound connection to a web
server within your organization.
In one instance it is the outside local and outside global addresses
listening on port 80, and for the other it is the inside global and
inside local addresses listening on port 80.
Presumably, you would expect/want both translations to be influenced by
your NAT translation port-timeout configuration. If not, you'd have to
settle for a generic TCP timeout, or configure a timeout for all
possible client ports for one of the two scenarios.
Once connection initiation triggers the translation, I would expect
traffic in either direction would reset the timer.
Best Regards,
News Reader
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