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Vern,

>I went looking because the mention of MTU = 1496 triggered a memory - IBM 
>recommends 1492 for 802.3. 

Dont' confuse MTU with maximum frame size.  The 400's line description has you
specify the frame size, not the MTU, and the frame size is 26 bytes larger than
the transmission unit.  The other 26 bytes are the PPP Headers (2 bytes), PPPoE
Headers (6 bytes), and the Ethernet Headers (18 bytes).

So the 1496 is equivlaent to a MTU of 1470 which means you still aren't
overflowing the 1492 size.  I don't know offhand why the system is set to a
frame size of 1496 -- I may try changing that.

Doug

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