This is a bit windy but I have attached the documentation from the site in question. --------------------------------------------------- Kali uses peer-to-peer instead of client-server technology. There are many reasons for this setup including efficiency, performance, and LAN emulation requirements. In any case, peer-to-peers means that your PC directly communicates with every other PC connected to your game lobby or chat server instead of only communicating directly with the Kali Servers. In a normal (non-NAT setup) Kali will send and receive all data on a single "port". A "port" is a simple way TCP/IP uses to allow different applications to use the same connection without getting data mixed up. Kali, by default, uses UDP port 2213. That means that anything sent to your PC and labeled with port 2213 will be sent to the Kali application. This allows any user on Kali to send data to your PC by referring to your Internet IP# and the Kali port number. With NAT, your PC must share that ip# with other PCs on the LAN. If two PCs on the LAN both tried to use the same port, communications would get totally mixed up. Data that was supposed to go to one PC would go to both PCs and it would be impossible to communicate properly. NAT systems "solve" this problem by translating the port numbers so that the rest of the internet sees each PC on a different port. Usually this solution works, but sometimes the NAT system behaves poorly and causes trouble. One common example of bad NAT behavior is only allowing one "connection" at a time on a port. UDP is supposed to be connectionless. You should be able send and receive packets from one port to any number of other PCs, but these poorly designed NAT systems make the assumption that like TCP, UDP must be only allowed to communicate with one other PC on any given port. This is simply wrong and what happens in Kali depends on how the router handles this. Some routers will create new NAT ports for each PC you communicate with which cause all sorts of strange behavior in Kali. Other NAT systems simply block the other clients and causes Kali to have trouble communicating. What can you do? If Kali works on one PC, but fails when more than one PC uses Kali at the same time, the fix may be simple. No matter what the problem, it's always a good idea to set each PC to use a different port in Kali and avoid conflicts on the NAT system. By doing this you can prevent most of the NAT related problems since the port contention no longer becomes a factor. To change the port, run Kali, go to the File menu, select Settings, click the Advanced tab and enter a value next to "Local Port". Each PC on the LAN should have a different port in Kali. Just use numbers like 2213, 2214, 2215, etc. Another common setting that can usually help involves enabling the "Special NAT Processing" in Kali. You can do this under the "Proxy" settings (File menu, Settings, Proxy). In some cases you may need to manually enter the local ip# of the other PCs on the LAN, but usually this isn't necessary. After doing both of the above, if you still have trouble, check to see if your router allows "static" port mappings or "pin holes". If so, for each PC, add it's local ip# and the port you setup in Kali for that machine. Each PC needs to have it's own "pin hole" or "static" mapping with a unique IP# and port. Be sure to setup these entries with "UDP" ports and not "TCP" (selecting both is ok, as long as UDP is selected).
------------------------------------------------------ Does this help? --- S Mohan <[EMAIL PROTECTED]> wrote: > Maybe this app requires more than one port like > H323. Port forwarding might > then solve the problem. > > Mohan > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] > Behalf Of Ray Olszewski > Sent: Sunday, August 03, 2003 5:22 AM > To: leaf > Subject: Re: [leaf-user] NAT Trouble > > > At 03:29 PM 8/2/2003 -0700, Mike Koceja wrote: > >I have another problem. My son is trying to access > an > >online gaming site and is running into a brick > wall. > >The site requires UDP port 2213 which I opened up > with > >no trouble. Whoever when he connects he gets the > >following error message... > > > > > > Your internet address changed! It was > > 4.47.177.158:62146, but now it appears to be > > 4.47.177.158:62156. This is a problem usually > > caused by a bad or improperly configured NAT > > setup. > > > > > >What do I need to do to correct this problem? > > Is this really an error message and not just an > informational one? That is > to say, does the game then fail to operate properly? > If the game goes on to > work, my own inclination would be to ignore the > site's whining. > > But assuming it is really an error message, what > instruction does the site > (or its companion URL) provide about how to > configure access through a > NAT'ing router? > > The message by itself is simply too lean in content > to figure out what they > want from you. I'd **guess** that the game client at > your end runs using a > particular port, not just any available port. If so, > you **may** need to > port-forward that port through the LEAF router > rather than simply use the > standard NAT'ing code to handle it (since that code > will not use the same > external support every time you access the site). > > Really, your best bet is to look more closely at the > game site. These guys > want their systems to work through NAT, so they > usually provide good > instructions about what you need to do to make it > work. Once we know what > they want, translating it into LEAF terms will > probablty not be hard, and > surely we can help with that part if you need it. > > BTW, I'm assuming here that 4.47.177.158 is your > external IP address. If > not ... if, say, your ISP does some further NAT'ing > upstream of you ... > then fixing this may be more of a challenge. > > > > > > ------------------------------------------------------- > This SF.Net email sponsored by: Free pre-built > ASP.NET sites including > Data Reports, E-commerce, Portals, and Forums are > available now. > Download today and enter to win an XBOX or Visual > Studio .NET. > http://aspnet.click-url.com/go/psa00100003ave/direct;at.aspnet_072303_01/01 > ------------------------------------------------------------------------ > leaf-user mailing list: > [EMAIL PROTECTED] > https://lists.sourceforge.net/lists/listinfo/leaf-user > SR FAQ: > http://leaf-project.org/pub/doc/docmanager/docid_1891.html > > > > ------------------------------------------------------- > This SF.Net email sponsored by: Free pre-built > ASP.NET sites including > Data Reports, E-commerce, Portals, and Forums are > available now. > Download today and enter to win an XBOX or Visual > Studio .NET. > http://aspnet.click-url.com/go/psa00100003ave/direct;at.aspnet_072303_01/01 > ------------------------------------------------------------------------ > leaf-user mailing list: > [EMAIL PROTECTED] > https://lists.sourceforge.net/lists/listinfo/leaf-user > SR FAQ: http://leaf-project.org/pub/doc/docmanager/docid_1891.html __________________________________ Do you Yahoo!? Yahoo! SiteBuilder - Free, easy-to-use web site design software http://sitebuilder.yahoo.com ------------------------------------------------------- This SF.Net email sponsored by: Free pre-built ASP.NET sites including Data Reports, E-commerce, Portals, and Forums are available now. Download today and enter to win an XBOX or Visual Studio .NET. http://aspnet.click-url.com/go/psa00100003ave/direct;at.aspnet_072303_01/01 ------------------------------------------------------------------------ leaf-user mailing list: [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/leaf-user SR FAQ: http://leaf-project.org/pub/doc/docmanager/docid_1891.html
