Hello,
 I have an ethernet interface with several vlans on it (FreeBSD 6.2-RELEASE #0).
 My program opens BPF on the parent device, receives tagged frames and responds 
by writing tagged frame to the BPF fd.
 It all works good, until size of response frame w/o tag becomes larger than 
1496 bytes (1500 with tag inserted) - mtu of parent device.i
 I'm a bit confused as mtu is 1500 on both vlanN and it's parent fxp0.
 I've tried to "ifconfig fxp0 mtu 1504" to make room for vlan tag, but 
the response is 
	ifconfig: ioctl (set mtu): Invalid argument

 Trying "ifconfig fxp0 -vlanmtu" also makes no difference.

 Is there a way to inject full-mtu vlan-tagged frame through BPF on parent 
device?
 I'd like not to open several tenths of BPFs for each vlanN if it's possible.

 I've tried on bge also with same results, so that is not connected with fxp
driver.


Eugene Perevyazko
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