>> 	the problems are:
>> 	- we have two ways to do VLAN: decreasing MTU or using bigger L2 frame
>802.3ac specifies that the total ethernet packet length can be up to
>1522 bytes so that switches don't have to fragment packets when
>converting between VLAN/non-VLAN networks. If we are going to handle
>VLAN we must obey this rule.

	but for legacy ethernet cards, it may not be possible...
	(or are you suggesting that we shouldn't use decreased MTU?)

itojun