I have the strangest problem. Our network (200ish machines on a ..254.0 subnet) are a mixture of XP and server OS's. All work fine. However, I have two new machines - both running Win7. Neither network propery via the edge switches (Cisco 2950) but work fine when hooking up directly to the server core switches (also Cisco - Catalyst 3750G ). The flakey behaviour on the edge switches is inability to ping anything other than itself, but it DOES pickup an address via DHCP, and are able to join the domain, validating credentials etc. (But not log into the domain - error No Logon Server Available)
When connected to the core switches everything works as expected.
I've tried ensuring windows firewall is off, giving valid static IP's, disabling IPV6 and some other general fiddling around all to absolutely no avail. There is no wireless network on this site.
Any ideas ?