Hey I have a really weird problem that I cannot isolate, I'm hoping someone else might have already had this problem and know a fix for it. My network is setup as such, my ISP connects to a domain computer through NIC 1. NIC 2 installed into the domain machine connects to a hub that the internal computers are connected too and use to I just purchased and upgraded NIC2 to a EG1032 (10/100/1000 gigabit network adapter) and replaced the hub with a 8-port gigabit switch (EG008W). Now I am having the following problems. The internal computers can get a dhcp address from the domain computer. The internal computers can connect connect to an external website using IP numbers. The internal computers cannot connect using DNS. (Dns is setup properly on domain computer) The internal computers can see (ping) each other but cannot see the domain computer. (Firewall is setup to block internet connections but internal is not filtered) The domain computer cannot ping the internal computers but can connect to the internet normally using DNS. I've never seen anything like this before, I think it's the network card causing the problem. The domain server is the only computer using a gigabit connection, the internal computers are 100mbs. The switch is auto sensing. On a side note, I thought perhaps UDP was being blocked, however the VoIP is working correctly through the switch. (UDP Dependent) Does anyone have any thoughts?