Chris Ross wrote:
[ ... ]
>   1) When I use fxp0, the MTU of the vlan interfaces are 1500, just as is
> the mtu on fxp0.  But, when I use wm0, I have to manually set the mtu to 
> 1504, because if I don't, the MTU on the vlan interfaces comes up as 1496 when
> they are created.  Why is this different?

The fxp NIC probably has hardware support for VLAN tagging and/or the slightly 
larger MTU of 1504.  The wm0 interface may lack either, so try using a smaller 
MTU with it.

-- 
-Chuck