Source NAT port range settings

[Omars]

Hello all,

I would like to know what is the default port range of source NAT overload on a Cisco router ? <1024–65535> ?

So, this command  "ip nat settings interface-overload port range start <1024–65535>" allow me to limit or increase the default  range ?

Thank you !

[Georg Pauwen · Accepted solution]

Hello,

I don't think there is a default. The command:

show ip nat portblock dynamic global detail

tells you what is configured. Without you actually defining a range, the command should render no output/result, meaning that by default, no ports are blocked.

[Omars]

Thank you Georg !

This command (show ip nat portblock dynamic global detail) show the TCP/UDP port blocks allocated for NAT.