We have 5 Mac Pros in my office, all running 10.6.8, today for some reason NONE of them had internet access, all the PCs in the office ran fine. It seems that for some reason, DHCP was giving us the wrong IP address. 192.168.1.x instead of what our internal server uses 10.1.1.x, I have no idea why this would only effect macs. And the kicker is, we plugged in an old iMac running on 10.4 and it was assigned the correct IP address. We were able to manually reset the IP addresses, but why would this be happening, I am totally stumped.