Perforce with dynamic ip

Hi everyone

I've set up a perforce server on an old always-on laptop which is always assigned a reserved address by the router. I have have an account at no-ip.com, which sends to my router, which in turn redirects port 1666 requests to this laptop.

when i try to set p4port to this no-ip.org address, that part is fine, but when i run p4d i get:

Perforce server error: Listen USERNAME.no-ip.org:1666 failed. TCP listen on USERNAME.no-ip.org:1666 failed. bind: USERNAME.no-ip.org:1666: WSAEADDRNOTAVAIL

Whereas if i just set the p4port to 192.168.0.6 i can access the server from behind the network using this one.. but i'd rather be able to access it externally as well..

I've read one other post on here in which someone had the same setup working (http://stackoverflow.com/questions/2397642/online-perforce-repositories , user was gaminghorror) but s/he hadn't gone into as much depth as I obviously needed..

have tried with router and windows xp firewalls off, and xp and router firewalls forward 1666 to this local ip

cheers!

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