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computer not receiving dhcp offer


I have a strange problem. On a flat network, a windows computer tries to get an IP address from DHCP and fails. Using Wireshark, I can see that the DHCP server sees the discover packet, sends an offer... and that's the last you see of it. I had this problem with our wifi clients, but I think it was RF interference. Now I'm seeing it on the cabled clients as well. I will be checking via port mirroring to see if the offer packet makes it to the destination switch port, but if it does (which means it's not a switching problem) - then what? My Google-fu has not found any useful information as to why a computer would ignore the dhcp offer packet. I have the latest NIC drivers installed and re-installed.

Any ideas? Thanks in advance.