Can anybody explain how to get the sub-interfaces to operate in this mode. I've enabled the physical interface which works fine over the frame, but i can't seem to get the actual point-to-point interfaces to communicate. I've got inverse-arp enabled, i've assigned the sub-interfaces their own Ip addresses in the same subnet, OSPF is running across the physical interface, but i've had a brain dead day - so simple i know, but still... Help would be appreciated.