I possibly have the same problem. I installed Fedora Core 2 Test 1 and had no problems with network connectivity, even after running yum several times to update the packages. Today, I updated again and now I can only access internet sites on the other side of my home router (Wireless Linksys) by using the actual IP address, name resolution fails. My other computer on the home network running RedHat 9 still has full network connectivity.
I also tried disabling ECN: I logged in as root, typed:
echo 0 > /proc/sys/net/ipv4/tcp_ecn
and still had the same problems. I even restarting network services after disabling ECN without success. I also checked resolv.conf and it is the same as the RedHat 9 computer. Any ideas?
-Jim