roy@alanine.phri.nyu.edu (Roy Smith) (04/19/91)
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!"
barmar@think.com (Barry Margolin) (04/19/91)
In article <1991Apr18.181504.21390@phri.nyu.edu> roy@alanine.phri.nyu.edu (Roy Smith) writes: > Does it make any sense for something to arp for its own ethernet >address? Many systems do this when they first boot. If it gets a reply, it means that someone configured two hosts with the same address, and it can then display an error message. However, this doesn't seem to be what was happening in your case, because it ARPs for itself whenever it receives the at-nbp packet. My guess is that it's a configuration problem. -- Barry Margolin, Thinking Machines Corp. barmar@think.com {uunet,harvard}!think!barmar