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From: mar@mit-eddie.MIT.EDU (Mark Rosenstein)
Newsgroups: net.micro,net.lan
Subject: Re: License violation detection
Message-ID: <1390@mit-eddie.MIT.EDU>
Date: Tue, 25-Mar-86 15:07:42 EST
Article-I.D.: mit-eddi.1390
Posted: Tue Mar 25 15:07:42 1986
Date-Received: Sun, 20-Apr-86 06:29:28 EST
References: <141@suneast.uucp> <20520@styx.UUCP>
Reply-To: mar@mit-eddie.UUCP (Mark Rosenstein)
Organization: MIT, EE/CS Computer Facilities, Cambridge, MA
Lines: 12
Keywords: UDP ICMP discard
Summary: not everyone implements UDP discard

In article <20520@styx.UUCP> fair@styx.UUCP (Erik E. Fair) writes:
>So in effect, everyone implements UDP discard (because of the way that
>UDP is specified) if they implement UDP at all. 

Not true!  If they do a compelete implementation of the IP protocol 
suite, then they will send an ICMP destination port unreachable
message back for each received UDP packet without a listener on 
that port.  Granted hosts should not send ICMP messages in response
to broadcast packets, but many do.  This could cause a flood of 
packets if one broadcasts UDP packets on a network with many hosts
which do this.
					-Mark