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Date: Thu, 14 Nov 1996 17:09:53 +0200 (IST)
From: Nadav Eiron <nadav@barcode.co.il>
To: Seppo Kallio <kallio@cc.jyu.fi>
cc: freebsd-questions@freebsd.org, Seppo Kallio <kallio@cc.jyu.fi>
Subject: Re: arp info overwritten 
In-Reply-To: <Pine.NEB.3.92.961114141254.10828A-100000@silmu.cc.jyu.fi>
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On Thu, 14 Nov 1996, Seppo Kallio wrote:

> 
> I am getting these error messages and it seems that it the connection to
> the ip-number (usually a DOS micro with NCSA Telnet) is lost from our
> FreeBSD 2.1.5 server.
> 
> 1. I assume the error is in network gateway unit at 00:00:0c:15:e7:0d
> 2. Can I somehow solve the problem in the FreeBSD box by adding some
>    routing info or something.
> 3. Can I dissable this overwriting somehow? How?
> 
> This problem and error message appears only in the FreeBSD nodes, not in
> Solaris, Linux, HP/UX etc. as far as I know.
> 
> Nov 14 12:00:01 silmu /kernel: arp info overwritten for 130.234.137.43 by
> 00:00:0c:15:e7:0d
> Nov 14 12:00:30 silmu /kernel: arp info overwritten for 130.234.137.43 by
> 08:00:07:94:74:83
> Nov 14 12:01:28 silmu /kernel: arp info overwritten for 130.234.137.46 by
> 00:00:0c:15:e7:0d
> Nov 14 12:01:55 silmu /kernel: arp info overwritten for 130.234.141.6 by
> 00:a0:24:67:9a:e4
> Nov 14 12:05:23 silmu /kernel: arp info overwritten for 130.234.138.11 by
> 00:00:0c:15:e7:0d
> Nov 14 12:05:23 silmu /kernel: arp info overwritten for 130.234.138.11 by
> 00:00:c0:d3:6f:a3

These messages are very plain:
You have *two* nodes who claim to have an IP address of 130.234.138.11, 
one with a MAC (ethernet) address of 00:a0:24:67:9a:e4, and the other 
with a MAC address of 00:00:c0:d3:6f:a3.

Find out where those nodes are, change the IP address on one of them, and 
those messages should go away.

> 
> One network guru here is explaining the gateway unit is sometimes
> answering too fast to the caller or something, faster than the FreeBSD
> node.
> 
> 
> Seppo Kallio
> U of Jyvaskyla
> Finland
> 
> 
Nadav