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Date: Wed, 24 Jan 2007 15:32:32 +0300
From: Ilia Gorstkin <cadavo@mail.ru>
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Subject: arp: unknown hardware address format
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Hi all!

FreeBSD 6.2-release.
 I'm having trouble with arp:
arp: unknown hardware address format (0x4500)
and
arp: unknown hardware address format (0x4242)
these messages fall on the console in a plenty.

I do tcpdump -exn "arp[0]=0x45 and arp[1]=0":

tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on xl0, link-type EN10MB (Ethernet), capture size 68 bytes
15:12:23.308179 00:02:55:53:46:13 > ff:ff:ff:ff:ff:ff, ethertype ARP 
(0x0806), length 60: truncated-arp
        0x0000:  4500 0020 9f4e 4000 3f2f bfa1 c0a8 fc6b  E....N@.?/.....k
        0x0010:  c0a8 5f02 2081 880b 0000 8000 0000 0023  .._............#
        0x0020:  0000 0000 0000 0000 0000 2020 2020       ..............
        0x0000:  4500 0020 9f4e 4000 3f2f bfa1 c0a8 fc6b
        0x0010:  c0a8 5f02 2081 880b 0000 8000 0000 0023
        0x0020:  0000 0000 0000 0000 0000 2020 2020
15:12:23.428057 00:02:55:53:46:13 > ff:ff:ff:ff:ff:ff, ethertype ARP 
(0x0806), length 60: truncated-arp
        0x0000:  4500 0020 9f4f 4000 3f2f bfa0 c0a8 fc6b  E....O@.?/.....k
        0x0010:  c0a8 5f02 2081 880b 0000 8000 0000 0025  .._............%
        0x0020:  0000 0000 0000 0000 0000 2020 2020       ..............
        0x0000:  4500 0020 9f4f 4000 3f2f bfa0 c0a8 fc6b
        0x0010:  c0a8 5f02 2081 880b 0000 8000 0000 0025
        0x0020:  0000 0000 0000 0000 0000 2020 2020


In the arp-table of my network there is not  MAC-address 00:02:55:53:46:13.

Where is it address from?
How does it influence on safety?
How to solve this problem? Thanks