ethtool -k eth0
rx-vlan-offload: on
tx-vlan-offload: on
Older kernels (2.6.32-33) do not have vlan-offload support. The vlan support in Ubuntu fails once you use a kernel which does have vlan offloading. Ethtool fails to disable the vlan offloading.
It would be nice the have vlan support in the next LTS release (12.04). Vlan support is a enterprise feature, people running large networks need it. vlan offloading support would be very nice.
vlan support is still broken in the oneiric beta.
But ethtool does give a clue:
ethtool -k eth0
rx-vlan-offload: on
tx-vlan-offload: on
Older kernels (2.6.32-33) do not have vlan-offload support. The vlan support in Ubuntu fails once you use a kernel which does have vlan offloading. Ethtool fails to disable the vlan offloading.
It would be nice the have vlan support in the next LTS release (12.04). Vlan support is a enterprise feature, people running large networks need it. vlan offloading support would be very nice.