please detect your Tor server's IP address through NAT too

A user wrote:

One request is the ability of tor to discover by himself the public IP when natted without me edit the torrc or the /etc/hosts...maybe some functions that run every once that check and maybe change the address...this is useful if you have the server running all day but the connection is not so reliable.

[Automatically added by flyspray2trac: Operating System: All]