I'm wondering if anyone has ideas on this one, since it's a first for me. I can access the internet just fine with a browser, but using PING or TRACERT from a command prompt just shows requests timing out once they leave my network.
To take some variables out of the equation, I tried reducing my network infrastructure down to just the Comcast cable line coming out of the wall connected to a Linksys BEFCMU10 v4 cable modem which went directly to my Windows 7 laptop with no software firewall, and the issue was still present.
Again, I'm browsing the internet (like posting this question) just fine, but can't ping anything (including this site right now) without all the packets getting lost.
I'm not blocking ICMP on my side, and I don't suspect Comcast is systematically blocking it all the sudden. What am I overlooking?