Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.2 9/18/84; site nrcvax.UUCP Path: utzoo!watmath!clyde!burl!ulysses!bellcore!decvax!decwrl!pyramid!hplabs!sdcrdcf!psivax!nrcvax!andre From: andre@nrcvax.UUCP (Andre Hut) Newsgroups: net.micro,net.lan Subject: Re: License violation detection Message-ID: <630@nrcvax.UUCP> Date: Thu, 17-Apr-86 23:10:18 EST Article-I.D.: nrcvax.630 Posted: Thu Apr 17 23:10:18 1986 Date-Received: Sun, 20-Apr-86 05:25:02 EST References: <141@suneast.uucp> <20520@styx.UUCP> <136@brl-sem.ARPA> <612@nrcvax.UUCP> <117@mit-vax.UUCP> Reply-To: andre@nrcvax.UUCP (Andre Hut) Organization: Network Research Research Corp. Oxnard,CA Lines: 42 Xref: watmath net.micro:14371 net.lan:1430 In article <117@mit-vax.UUCP> romkey@mit-vax.UUCP (John Romkey) writes: >In article <612@nrcvax.UUCP> andre@nrcvax.UUCP (Andre Hut) writes: >>In article <136@brl-sem.ARPA> ron@brl-sem.ARPA (Ron Natalie ) writes: >>>In article <20520@styx.UUCP>, fair@styx.UUCP (Erik E. Fair) writes: >>>> Fundamental question to ask: >>>> what happens to a UDP packet recieved on a port for which there is >>>> no process listening? >>>> Answer: packet gets thrown away. >>> >>>Guess again, chucko. You may get an ICMP Destination Port Unreachable >>>message in return (you do on the VAX). >> >>"Chucko" ???? >> >>You are BOTH right. The packet is thrown away, and an ICMP message should >>be sent back. > >Hang on there a minute. Normally an ICMP port or protocol unreachable >would be generated, HOWEVER, this conversation originated from a message >about *broadcasting* a packet to the UDP Discard port. Good IP >implementations should NEVER send ICMP errors in response to broadcast >packets. Right. But where in the "Fundamental question to ask" does it say anything about a *broadcast* packet? Also, remember that not all link-layers support the broadcast notion, so you would have to be assuming something about the type of medium you are dealing with to make that statement. -- ----------------------------------------------------------------------------- ihnp4-\ sdcsvax-\ \ Andre' Hut sdcrdcf!psivax!nrcvax!andre hplabs--/ / ucbvax!calma-/ Network Research Corporation 923 Executive Park Dr. Suite C Salt Lake City, Utah 84117 -----------------------------------------------------------------------------