In message <00e201c17d22$d67a8bc0$0100a8c0@snowdrop>"David Laight" writes
>Maybe I'm not sure exactly what is up here....
>
>Surely the path MTU discovery has to be done separately by both ends.
>(it is quite easy to arrange completely different routes for the two
>directions of a single connection - phone line and satellite?)
>
>This puts the onus on the transmitting end to ensure it doesn't break
>the valid MTU.  The 'other' end will (must?) either determine an
>accurate mac MTU or use a horribly small one, the value 'our' end
>used won't (shouldn't) affect its calculations.

Yah, sorry, I guess I misunderstood.  I thought you were talking
about guessing the value to send in the TCP MSS option at the
start of every TCP connection.

Kevin
kml@patheticgeek.net