Problem with a old Combat Flight Simulator, running out of ideas

temxs

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Ottawa, Ontario
Win XP service pack 2 2g ram p4 3.0ghz
Brief history of the situation;

A customer couldn't play his favorite game anymore (Combat Flight Simulator 1), logging into the Multi-play feature, TCP/IP would not respond when his friend's server is up. He called a technician which resulted in the whole internet connection crashing.

I was then called into the scene, and setup the Linksys router properly. This gentlemen plays his favorite games, Battlefield 1942 as well as many others, however, the one game still not responding to multi-play is Combat Flight Simulator.

I've tried setting up the router with the specific port forwards, then DMZ, and still nothing. As a test I then took the router out of the equation and connected the PC directly into the modem, the multi-play friend's IP shows up, it works.

I've tried to understand the cisco linksys router, I disabled the firewall features aswell to test.

I've officially ran out of ideas, I also tried with another linksys router and the same result, nothing. The only way the game works is without the router, but all the other games work perfectly.

I've probably been at this too long and need a fresh pair of eyes on this, any ideas ?

- The game has not been functional with the router for ~14 days now
- The firewall with windows xp is disactivated and the other software is Avast. Added the exceptions list anyway including the game and specific ports. (the game runs without the router present, didn't spend too much time on this issue because of it)
- Another router was tried with the same result (different router although still linksys)
- No software was installed according to the customer since the problem started. Which leads me to believe it could/may be result of a windows patch/update but which patch would specificaly block the game using a router and not using the modem directly.
 
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Have you tried updating the firmware on the router?

On my linksys I use the ddwrt firmware. It might be worth a try.
 
Thanks for your input !

the firmware on the Linksys WRT160N is up to date.

I havn't pressured the customer to up to service pack 3 only because I'm not sure how or if it will fix it, I don't feel comfortable fishing, specially with service pack 3 unsure on how easy it is to go backwards to sp2 if he's unhappy with the changes.

I could try to use the linksys as a switch, but would lose the security features of having a router.

I'll keep this up to date, going back at 4pm EST.
 
I'm not familiar with the software on this router. Since you mentioned port forwarding, I assume it supports NAT. Can you list the rules you're using?
 
Open your router's configuration page in your browser. for eg: 192.168.1.1/ which is same as your gateway ip address.
It will ask for username and password.
Look for the page like "Port forwarding" or "Virtual Servers" or "NAT Configuration".
Click on the Add button or link.
For Server IP use your computer's IP. For eg: 192.168.1.2. External and Internal port range are same values. For Single port, give same port value for start and end. If you are not sure about protocol, set up for both TCP & UDP.
After configuring, you need to restart router.
Ports For CFS1 are as follows:
47624 TCP
2300-2400 TCP
2300-2400 UDP
If your customer is using the WRT160N with the installed Linksys firmware, I strongly reccomend upgrading to DD-WRT. http://www.dd-wrt.com/phpBB2/viewtopic.php?t=50263

Good Luck!
 
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