Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!watmath!clyde!cbatt!ucbvax!TOPAZ.RUTGERS.EDU!hedrick
From: hedrick@TOPAZ.RUTGERS.EDU.UUCP
Newsgroups: mod.protocols.tcp-ip
Subject: Re:  UDP vs. ICMP dest unreachable messages
Message-ID: <8702110804.AA27296@topaz.rutgers.edu>
Date: Wed, 11-Feb-87 03:04:13 EST
Article-I.D.: topaz.8702110804.AA27296
Posted: Wed Feb 11 03:04:13 1987
Date-Received: Thu, 12-Feb-87 04:21:04 EST
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The ARPA Internet
Lines: 8
Approved: tcp-ip@sri-nic.arpa

You suggest that the kernel should remember destination unreachable
messages, and not bother to try again for some time.  The problem
with this is that there are often transient routing problems.  If
you try again, things might actually work.  Until the core gets
more reliable, I would rather retry. Indeed for a while we
intentionally broke our TCP code so that it would keep trying when
it got destination unreachable, instead of aborting the connection.
This helped us keep connnections up to certain hosts.