Paul Taylor wrote:
> Honestly, I don't know... I think it was drilled into me somewhere that 1500
> was the max...  I know Token Ring can be much higher (4464 I think).

I'm no expert but as I see it 1500 is a default for Ethernet devices 
simply to promote interoperability.
I haven't tried this yet but I would think that increasing the MTU on 
all your Ethernet devices would speed things up and lower CPU loads.

> I suppose if the device his WAN interface is talking to supports it, and if
> the driver in FreeBSD does, it should work..

Found this, pretty interesting:
http://www.psc.edu/~mathis/MTU/