I've been having Internet connection problems with my desktop recently. They started after restarting for updates last week. Specifically, some websites resolve (slowly), while others (such as any Stack Exchange site) are utterly unreachable. It also seems like some Internet facing applications aren't having too much difficulty - I have a feed reader, Steam, and Skype apparently working (though the feed reader is rarely getting images, and Steam has some odd visual behavior such as missing buttons).
Network Topology: I have a single Linksys router (WRT160Nv3) with DD-WRT firmware connected to my modem. I then have my desktop (windows 7, 64-bit) plugged into said router. If I pull the cables and plug my desktop directly into the modem it connects fine.
There is a second (Ubuntu, 10.04 server edition) box able to connect to the Internet via cable to the router with no issue (we tried swapping ports to no avail), and multiple wireless devices are working with no problems (Ubuntu, Mac, and Windows laptops, as well as a variety of smartphones).
- Internet Explorer, Firefox, and Chrome. Each give the same behavior (with the same sites).
- Release, renew, and clearing my DNS cache via
- Flashing the router.
- Switching ports on the router.
- Connecting directly to sites (using
pingto find their IP - some resolve the IP but never connect, others work fine).
- Restoring the computer to the save point on the last known operable day.
- Connecting directly to the modem (works, but not a real fix).
- Run Malwarebytes and Avast, with both reporting no issues.
What might be going on here, and how can I fix it (or even just diagnose the problem)? At this point it honestly feels like my router is just ignoring large amounts of traffic to/from my desktop...