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Date: Wed, 18 Jun 2003 09:42:34 -0400
From: Steve Shorter <steve@nomad.lets.net>
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Subject: arp "bug" ?
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Howdy!

	I have a nfs booted server (FreeBSD 4.5p24) with local disk for data/swap.
It has 2 network interfaces configured as follows ....


Jun 18 08:16:18 <14.6> db0 /kernel: fxp0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
Jun 18 08:16:18 <14.6> db0 /kernel: inet 192.168.10.11 netmask 0xffffff00 broadcast 192.168.10.255
Jun 18 08:16:18 <14.6> db0 /kernel: ether 00:d0:b7:c9:c5:f0 
Jun 18 08:16:18 <14.6> db0 /kernel: media: Ethernet autoselect (100baseTX <full-duplex>)
Jun 18 08:16:18 <14.6> db0 /kernel: status: active
Jun 18 08:16:18 <14.6> db0 /kernel: fxp1: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
Jun 18 08:16:18 <14.6> db0 /kernel: inet 192.168.20.11 netmask 0xffffff00 broadcast 192.168.20.255
Jun 18 08:16:18 <14.6> db0 /kernel: ether 00:b0:d0:49:ba:05 
Jun 18 08:16:18 <14.6> db0 /kernel: media: Ethernet autoselect (100baseTX <full-duplex>)
Jun 18 08:16:18 <14.6> db0 /kernel: status: active


	Twice in the last 24 hours it logged the following arp messages

Jun 18 07:57:12 <1.3> db0 /kernel: arp: 00:b0:d0:49:ba:05 is using my IP address 192.168.10.11!
Jun 18 08:00:39 <1.3> db0 /kernel: arp: 00:b0:d0:49:ba:05 is using my IP address 192.168.10.11!
Jun 18 08:04:17 <1.3> db0 /kernel: arp: 00:b0:d0:49:ba:05 is using my IP address 192.168.10.11!
Jun 18 08:07:06 <1.3> db0 /kernel: arp: 00:b0:d0:49:ba:05 is using my IP address 192.168.10.11!


	I seems that the MAC address of the fxp1 interface is being confused somehow
with the IP of the fxp0 interface.


	Since this interface is the root fs the machine hung and had to be power
cycled. I don't see why this error should happen, both interfaces are on
different subnets ie. fxp0 - 192.168.10.11/24  and fxp1 - 192.168.20.11/24.

	I have some 4.6.2 servers that also log similar messages, but I've been
ignoring them up to now cause it never was a "problem".

	Is this a bug? or is there a misconfiguration or other fix?

	thanx - steve