On Thu, Jun 08, 2000 at 18:03:45 +1200, Dave Preece wrote:
> Just learning about this: I can see the advantages but does anything use it?
Sure, TCP uses it.
TCP (at least in FreeBSD) sets the "don't frag" bit on all its outgoing
packets.
If the packet gets to a router with an outgoing MTU that is too small to
hold the packet without fragmentation, the router is supposed to send back
and ICMP message telling the source machine to use a smaller packet size.
When the source machine receives the ICMP message, it will update the MTU
for that route, and try sending packets out again with the lower MTU.
Ken
--
Kenneth Merry
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