I have one router with 10.0.0.1/24 on an ethernet interface, and 10.0.0.1/24 on a vlan interface. The network card is an Intel 1000 series and vlans work fine on it otherwise.

Any problems with using the same ip address on a VLAN interface and on an ethernet interface at the same time?

I have to do this to isolate one of our colo client's traffic from the rest.

Thanks

Any problems with using the same ip address on a VLAN interface and on an ethernet interface at the same time?

This will not work. You should not configure the same IP address (or any overlapping networks, for that matter) on more than one interface.

--Tom