original problem here:

http://forums.d2jsp.org/topic.php?t=62469337&f=34

so far we found out that there is some...thing called NAT that blocks peer to peer connection and makes it impossible to use gameranger to play games does anyone know how to disable that fucking nat piece of shit?

reward still up, HELP MEEEE

you can't disable NAT but you can set it to Open: this is a step by step i found elsewhere

1. Log into router's IP address and enter password. Select "Advanced Setup". ( If u don't know ur IP or ur Pass call the Router maker and they will give u the info_

2. Click on Advanced on left hand menu and select UPnP

3. Check all three boxes in window and click on Apply

Post your modem type. It probably has an option on your modem to enable NAT protocol, wich is the default in some modens.

i may need some time to check everything cause she needs her brother for that! but if a solution works i will send reward, worry not!

also cant post modem type now, will do in a few hours

just turn of fire wall... need more info btw, did u try using hamatchi? game ranger is bugy!

try my solution, I had NAT issues not so long ago on PS3 and remember following a similar solution

will try everything in the order of posting ofc ^^ but shes a complete noob and needs her brother back home to try all, thats why i must wait

Hard to say exactly what's going on without being able to actually access the computer/network and poke around, but my first guess is that she needs to forward the port that gameranger uses. That also involves first setting the computer to use a static (instead of dynamic) local IP. If she knows what model router she is using, select it here: http://portforward.com/english/applications/port_forwarding/GameRanger/default.htm and it will show how to do all of that.

Edit: here's a more in depth explanation if you're interested -
Basically the problem is that we are running out of IP addresses. 2 billion isn't enough. So people figured out a clever way to allow multiple computers to use the same one: a network address translator (NAT). Basically, the NAT (also the router) has a single, global, external IP address, and all computers that connect through the router are given local "fake" IP addresses that are only visible to other computers on the router, and the router itself. When a computer behind the NAT makes a connection to a server somewhere else in the world, the NAT re-writes the source IP address to be the NAT's external IP, instead of the computer's fake, local IP. Then when that server responds, the response goes to the NAT, and the NAT passes it on to the computer that originally started the connection. Now, the problem comes when the connection is initiated the other way. If a server wants to connect to a computer behind the NAT, it can't. The only IP it can possibly know of is the NAT's external one, so it can send a request there, but the NAT doesn't know which of the computers connected to it to pass that request on to. So to fix this, we can just manually specify a rule in the router that says "whenever a connection comes in on port #X, forward that to local IP address #Z". So, first of all you need to configure the computer you want to allow connections to, to always have the same local IP, and then you can check which port gameranger uses, and put in the corresponding rule on the router's configuration, and hey presto, it should work.

This post was edited by jfkelley on May 18 2012 04:54am