Client Computers cannot ping gateway on LAN
Posted on 2011-10-11
I'm having trouble with client computers getting on the internet through the gateway. Approx 150 clients.
DHCP server is issuing all the correct information to clients and AD is authorized and working properly. I noticed that:
1. Clients can ping servers and each other across the network just fine (multi-building campus)
2. Servers can ping clients without a problem
3. Servers can ping the Gateway (housed in another building away from the server farm) without a problem.
4. Clients drop 8 of 9 ping requests when trying to contact gateway with command promt: ping <gatewayIP> but the servers have no problem.
5. Clients located directly next to the gateway on the same switch drop 8 of 9 requests. Location on the network does not seem to matter.
6. All computers can ping DNS Server no problem.
XP Machines (while only successful pings 1 of 9 on average) can access the internet just fine as well as all LAN computers/servers.
Vista/7 Machines however will show the internet globe temporarily, occassionally a page, but then lose internet connection and become LAN only, "regaining" access later, to only have it disappear again. (originally thought this was an IPv6 or DNS problem, but now I think otherwise, disabling didn't fix the situation). Pinging from XP machines also had the non-responses.
Because of odd situation, I do not believe there is a failing NIC or Broadcast NIC out there on the LAN as the problem only applies to client PCs who also have no trouble contacting each other or the servers.
Hope someone has thoughts on this, it would be much appreciated...