I haven't followed this thread, so I apologize if this doesn't help, but 
Jumbo frames on gigabit cards support a much higher MTU - 9000.

Jeff

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 suppose if the device his WAN interface is talking to supports it, and if
>the driver in FreeBSD does, it should work..
>
>-----Original Message-----
>From: Marko Vukovic [mailto:marko at aquamanta dot co dot za] 
>Sent: Thursday, February 09, 2006 12:54 PM
>Cc: m0n0wall at lists dot m0n0 dot ch
>Subject: Re: [m0n0wall] Help how change MTU size to 2048 value on WAN inte
>rface
>
>Paul Taylor wrote:
>  
>
>>Marko,
>>
>>	I'm a bit confused here...  All the interfaces that Monowall
>>supports are Ethernet, right?  So, wouldn't an MTU of 1500 be the max?
>>
>>	What sort of device would you connect to with that MTU?
>>    
>>
>
>They are Ethernet sure but what does MTU have to do with Ethernet? MTU 
>is a maximum size for an IP packet. 1500 is a default for TCP/IP on 
>Ethernet devices. He may have some strange PPPOE setup that requires 
>that MTU, I don't know but why should 1500 be the maximum?
>
>Ciao
>--
>Marko
>
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>