> Under linux you can specify the MTU for an interface using ifconfig
> and the mtu key word.

Or you can use path-mtu-discovery (which is a default iirc) the kernel
keeps sending bigger and bigger packets with the 'do-not-fragment' flag
set. Eventually somewhere on the path will drop a packet 'cos it's too
big to send unfragmented, and then you know what's the optimal size packet
for that connection.

(This relies on ICMP replies to know when a packet got dropped, so it'll
break if some moron is cluelessly blocking all ICMP traffic)

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Received on Thu Dec 14 14:59:11 2000