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From: braden@VENERA.ISI.EDU
Newsgroups: comp.protocols.tcp-ip
Subject: Re: ..."layering violations"
Message-ID: <8711021615.AA00166@braden.isi.edu>
Date: Mon, 2-Nov-87 11:15:34 EST
Article-I.D.: braden.8711021615.AA00166
Posted: Mon Nov  2 11:15:34 1987
Date-Received: Sat, 7-Nov-87 08:54:39 EST
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Organization: The ARPA Internet
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	Yes, I know they're *supposed* to. I meant to say that I've seen many
	gateways use the destination IP address of the original datagram as the
	source address for the IP datagram containing the ICMP message, and this
	makes it impossible to discern where the problem is.
	
	One implementation around here returns every broadcast it sees with
	a "port unreachable" ICMP message and puts the IP broadcast address in
	the IP source field!
	
	Phil
	
Phil,  I wish you would name names.  Being coy about whose box is
screwing up isn't doing anyone a favor.  Since there is no Internet
Conformance testing service, we have to  collaborate as a group to
"encourage" conformance from the vendors.

Bob Braden