> Some of network driver like fxp or ex disable or enable device when an
> If I modify fxp_start to just return when IFM_ACTIVE isn't set, it
> looks like all packets are sent to wire.  But, of course you can do
> this only when driver or device can report link status.

At least, you should consider the link won't be active for long time,
e.g. when drop cable is not phisically connected.  Perhaps normal
transmit timeout by watchdog timer should be applied for the holding
packet.

Atsushi Onoe