NAT router mapping timeout

Is there any typical value for the timeout until a NAT router breaks the
mapping between internal and external ports in a tcp connection?
In other words , suppose I have a tcp connection in my NAT router. In a
certain moment its disconnected. Now I want to reconnect from the outside
world to the same external port.
Can I do that and within what time limitation(tipical values if possible)?

Regards

Gil

Gil wrote:
> Is there any typical value for the timeout until a NAT router breaks the
> mapping between internal and external ports in a tcp connection?
> In other words , suppose I have a tcp connection in my NAT router. In a
> certain moment its disconnected. Now I want to reconnect from the outside
> world to the same external port.
> Can I do that and within what time limitation(tipical values if possible)?
>
> Regards
>
> Gil
Can someone second this but I've never seen a configurable timeout
period for a nat. If the router does Nat, and u have a pool of ips ,
dynamically/statically assagined, then the dhcp server would control,
periods to hold that ip.

Gil, I need to rectify myself, it depends on the router your using.
Most responses in this group refer to routers for home and small
office, however there are some routers that allow for this however it
depends on the type of translation you are referring to, and again the
router. Cisco's default translation timeout is 86,400 seconds (24
hours), but you can change that with the command ip nat translation
timeout, for example.