No reply in over a year, seems like this was a kernel bug related to the e1000 driver, not a userspace bug.
** Changed in: vlan (Ubuntu) Status: Incomplete => Invalid -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to vlan in Ubuntu. https://bugs.launchpad.net/bugs/1006547 Title: vlan doesn't work properly on 12.04 server To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1006547/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs