Frequent connection drops when playing online games (StarCraft 2, Battlefield 3) and behind NAT - how to diagnose? [migrated]

Posted by Moshev on Server Fault See other posts from Server Fault or by Moshev
Published on 2012-04-06T15:40:06Z Indexed on 2012/04/06 17:32 UTC
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Filed under:

router

|

nat

|

gaming

I am having some trouble with (I suspect) my wireless router. It's connected to the internet with a regular lan cable and has a static, public IP address. Our two home PCs connect to the router with regular lan cables, plus there's a laptop which connects over wifi.

diagram:
    Internet
       |
       | <- isp-supplied cat5 ethernet cable
       |
      D-Link D300 ...wifi... laptop
     /           \
    / <- cable -> \
  PC1             PC2

The PCs and laptop are behind NAT and share the router's public IP. The router is a D-Link D300. PC1 is used for online gaming and I'm experiencing frequent "connection dropped" errors when playing Battlefield 3, StarCraft 2 and the Diablo 3 beta; but not with TeamFortress 2 or the Tribes Ascend beta. The issue goes away when I remove the router and connect PC1 directly to the ISP's cable. I have also tried disconnecting PC2 and the laptop, leaving PC1 as the only machine connected to the router - doesn't help. How can I diagnose what precisely the issue is?

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