I'm not sure what I've done to change things (my scientific method is change as many things as possible all at the same time), but "dot1q" tagging is now working from my guest OS. When I try to create a vlan named "vlanX" where x is the vlan number, the guest complains about the vlan not being present. However, when I create a vlan named eth2.X it works just fine. The only thing I changed on the host was setting eth2's ip address to 0.0.0.0 with no other parameters. Just FYI for future reference: Host NIC: Intel Dual Gigabit server adapter (pcie x4) Guest NIC: VMWare tool's accelerated network adapter Switch: Old school Cisco 2924XL Thanks for the suggestions everyone! Gordon -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.centos.org/pipermail/centos/attachments/20071009/fa167c73/attachment-0005.html>