From owner-freebsd-current  Thu Feb 29 17:11:01 1996
Return-Path: owner-current
Received: (from root@localhost)
          by freefall.freebsd.org (8.7.3/8.7.3) id RAA26973
          for current-outgoing; Thu, 29 Feb 1996 17:11:01 -0800 (PST)
Received: from asstdc.scgt.oz.au (root@asstdc.scgt.oz.au [202.14.234.65])
          by freefall.freebsd.org (8.7.3/8.7.3) with SMTP id RAA26927
          for <current@freebsd.org>; Thu, 29 Feb 1996 17:10:29 -0800 (PST)
Received: (from imb@localhost)
	by asstdc.scgt.oz.au (8.6.12/BSD4.4)
	id MAA21826; Fri, 1 Mar 1996 12:09:32 +1100
From: michael butler <imb@scgt.oz.au>
Message-Id: <199603010109.MAA21826@asstdc.scgt.oz.au>
Subject: Re: Processing ICMP packets (was: -stable hangs at boot (fwd))
To: pst@shockwave.com (Paul Traina)
Date: Fri, 1 Mar 1996 12:09:31 +1100 (EST)
Cc: current@freebsd.org
In-Reply-To: <199602291801.KAA00600@precipice.shockwave.com> from "Paul Traina" at Feb 29, 96 10:01:21 am
X-Mailer: ELM [version 2.4 PL24beta]
MIME-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Sender: owner-current@freebsd.org
Precedence: bulk

Paul Traina writes:

>   Just so long as you don't wind up triggering the old 4.2 TCP bug.
>   Namely, when a port is unreachible, then *ALL* connections to that host
>   are discarded.  It is safer to silently discard packets in a packet
>   filter than to send back ICMP messages since it won't trigger these bugs
>   and will be treateed as if it was lost and retransmitted or timed out.

Just FYI .. Interactive SVR3.2 version 4.1, the current release - although I
haven't tested the last maintenance update, _still_ has this problem
rendering sendmail incapable of receiving mail from hosts whose identd port
is unreachable :-( SunSoft's tardiness about fixing this (and more than a
few other things) was a major reason why I switched to FreeBSD .. it works,

	michael