On Monday, October 01, 2007 10:34:37 AM -0600 Danny McPherson
<danny(_at_)tcb(_dot_)net> wrote:
Note that in real deployments just this behavior has broken things
on occasion, as many firewall and other such policy application points
assume things like DNS resolution will only be UDP/53 transactions.
Yeah; I'm getting a little tired of having our protocols redefined based on
the incorrect assumptions of people who don't understand them. The DNS
sometimes uses TCP, UDP flows can last more than one round trip, and ICMP
unreachable messages are an essential part of IP; vendors and operators who
assume otherwise should be made to fix their assumptions, instead of
everyone else having to cripple their applications and networks to make the
assumptions true.
-- Jeff
And IP fragnments exist and are useful.
--
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742 INTERNET: Mark_Andrews(_at_)isc(_dot_)org
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