Re: Bizarre arp problem with Linux Fedora 'Yarrow'

From: Cameron Kerr (cameron.kerr_at_paradise.net.nz)
Date: 03/08/04 

Date: 9 Mar 2004 08:23:29 +1300

Robert Mitchell <robert.mitchell4@sympatico.ca> wrote:

> Running ethereal showed that all the other RH and Win boxes (and my
> Linksys wireless gateway) BROADCAST their arp requests as expected, but
> the new box sent them directly (frame id = 04) to ethernet physical
> address 00:00:00:00:00:00. The response ( from the local LAN adapter I
> believe) was ICMP destination unreachable.

I'm currently reading the ZeroConf specs, and it seems that such a
packet would be an ARP Probe.

    ``In this document, the term "ARP Probe" is used to refer to an ARP
    Request packet, broadcast on the local link, with an all-zero
    'sender IP address'. The 'sender hardware address' MUST contain the
    hardware address of the interface sending the packet. The 'target
    hardware address' field is ignored and SHOULD be set to all zeroes.
    The 'target IP address' field MUST be set to the address being
    probed.''

        -- Section 1.2 "Terminology"
        http://files.zeroconf.org/draft-ietf-zeroconf-ipv4-linklocal.txt 

-- 
Cameron Kerr
cameron.kerr@paradise.net.nz : http://nzgeeks.org/cameron/
Empowered by Perl!

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