Stut wrote: > Fahad Pervaiz wrote: >> Hello, >> >> I want to get the actual IP of a client behind NAT or a Firewall. Is >> there >> anyway to traverse NAT to get the actuall/real IP of the client to check >> weather its reachable directly or not. >> >> OR Is there anyother way to do that. Plz suggest > > No, you can't. And even if you could it wouldn't do you any good. Think > about what NAT does and you'll realise why. > > As for firewalls... if there was a way around it there'd be no point in > having the firewall. Yeah the only way would be to get the client to supply it. As Stut says I'm not sure why you'd gain anything from doing this as you would not be able to contact that IP directly anyway. If you are trying to open a connection to the client machine from the server this is pretty much impossible. Either the firewall would have to forward an external port to the internal client you could use or you could use something along the lines of UDP packets sent to the firewalls NAT return ports in a way that fools it into thinking it is a reply to an outgoing package. This is (roughly) how methods such as STUN work for routing SIP traffic around NATed firewalls. However all this said, all of this is client driven, and I can't actually think of a reason for even trying to do this that isn't.... erm. dodgy! :p Col -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
