ICMP Packets.

Darren Reed darrenr@reed.wattle.id.au
Fri, 5 Jun 1998 22:07:31 +1000 (EST)

In some email I received from Bennett Todd, sie wrote:
> I haven't seen too many such. Rather, the original poster who started
> this thread asked _what_ sort of ICMP packets (like the ``need frag''
> you refer to for path MTU discovery) we should let through because
> they're actually necessary.

You could consider adding "source quench" ICMP messages to the "let
through" list.

"Time exceeded" is needed for traceroute (and in an ever growing
internet, you may need to be aware of boxes with low default ttl's).