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From: roy@alanine.phri.nyu.edu (Roy Smith)
Newsgroups: comp.protocols.tcp-ip
Subject: self-referential arp?
Message-ID: <1991Apr18.181504.21390@phri.nyu.edu>
Date: 18 Apr 91 18:15:04 GMT
Sender: news@phri.nyu.edu (News System)
Organization: Public Health Research Institute, New York City
Lines: 27


	Does it make any sense for something to arp for its own ethernet
address?  This is some tcpdump output from a Kinetics FastPath I'm trying
to configure to use KIP/IPTalk:

13:18:44.62  wombat.phri.nyu.edu.16513 > 128.122.136.160.at-nbp: udp 43
13:18:44.62  arp who-has 128.122.136.160 tell 128.122.136.160
13:18:45.66  wombat.phri.nyu.edu.16513 > 128.122.136.160.at-nbp: udp 43
13:18:45.66  arp who-has 128.122.136.160 tell 128.122.136.160
13:18:46.68  wombat.phri.nyu.edu.16513 > 128.122.136.160.at-nbp: udp 43
13:18:46.68  arp who-has 128.122.136.160 tell 128.122.136.160
13:18:47.70  wombat.phri.nyu.edu.16513 > 128.122.136.160.at-nbp: udp 43
13:18:47.70  arp who-has 128.122.136.160 tell 128.122.136.160
13:18:48.72  wombat.phri.nyu.edu.16514 > 128.122.136.160.at-nbp: udp 43
13:18:48.72  128.122.136.160.16514 > wombat.phri.nyu.edu.at-nbp: udp 43
13:18:48.78  wombat.phri.nyu.edu.at-nbp > 128.122.136.160.16513: udp 43
13:18:48.78  128.122.136.160.at-nbp > wombat.phri.nyu.edu.16513: udp 43

	What do the "arp who-has 128.122.136.160 tell 128.122.136.160"
packets mean?  This is the kbox asking for its own ethernet address.  Is
that normal, or something I might have configured wrong, or a bug in the
gateway code?
--
Roy Smith, Public Health Research Institute
455 First Avenue, New York, NY 10016
roy@alanine.phri.nyu.edu -OR- {att,cmcl2,rutgers,hombre}!phri!roy
"Arcane?  Did you say arcane?  It wouldn't be Unix if it wasn't arcane!"