In my office, nearly everybody uses Mac and we have just only one Windows 7 system. Just this morning, all the mac systems (10.8.2) could not connect to the internet but could connect to the network.
When I tried pinging the DNS address, it replied but I can not ping www.google.com on any of the mac systems. If I try creating a new location for the network and enter all the details manually instead of autoConfig, it connects to the internet for like 30 seconds and then shuts off again. The connection still shows green afterall and could still ping the DNS.
I tried killing the mDNSResponder but still same issue.
EDIT: The Windows 7 PC is connected to the internet and I am raising this post using the windows 7 PC