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Date:      Thu, 9 Mar 2000 22:35:44 -0800
From:      Alfred Perlstein <bright@wintelcom.net>
To:        Dennis Jun <dennisjun@yahoo.com>
Cc:        freebsd-questions@FreeBSD.ORG
Subject:   Re: ARP errors?
Message-ID:  <20000309223544.D14279@fw.wintelcom.net>
In-Reply-To: <20000310054234.2537.qmail@web605.mail.yahoo.com>; from dennisjun@yahoo.com on Thu, Mar 09, 2000 at 09:42:34PM -0800
References:  <20000310054234.2537.qmail@web605.mail.yahoo.com>

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* Dennis Jun <dennisjun@yahoo.com> [000309 22:15] wrote:
> Hello all! I'm a FreeBSD newbie, so please bare with me if
> this question is very simple.
> 
> I have a simple home LAN setup of 2 computers: one is
> Windoze 98 and the other I recently installed with FreeBSD
> 3.4-RELEASE. Furthermore, I am running natd on the BSD box
> with two NICs. Both NICs are plugged into my hub and so is
> my 98 box. Also, my cable modem is connected to the hub as
> well (in the uplink port). So that's 4 connections going
> into the hub total (2 from BSD, 1 from 98, & 1 from my
> cable modem).
> 
> My 98 box has the ip of 192.168.0.6. My BSD box has 2 ips,
> one from the cable provider (on ed1, 24.xx.xx.xx) and the
> other is 192.168.0.1 (on ed2).
> 
> Now everything works fine. natd works great, so does named,
> and the firewall as well. However, I get this annoying
> message on my BSD box:
> 
> /kernel: arp: 192.168.06 is on ed2 but got reply from
> 00:c0:a8:50:9e:a7 on ed1.
> 
> What does this exactly mean? and how do I correct it?

A hub is a broadcast device, therefore both ethernet cards get
the replies, the kernel is annoyed that you are set up like this
because it's a misconfiguration.

You ought to just plug the cable modem directly into one of
the FreeBSD box's interfaces.

-Alfred

> 
> My guess is that if I simply plug my cable modem directly
> into ed1 I wouldn't get this result. However, I feel though
> I shoudn't be getting this in the first place. Can anyone
> help?
> 
> BTW, this is what an arp -a reveals:
> 
> sunnie$ arp -a
> ? (24.xx.xx.xx) at 0:0:xx:xx:xx:xx [ethernet]
> ? (192.168.0.6) at 0:c0:a8:50:9e:a7 [ethernet]
> 
> Many thanx in advance.
> 
> 
> =====
> PGP public key:
> http://i.am/dennisjun/
> or ldap://certserver.pgp.com/
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-- 
-Alfred Perlstein - [bright@wintelcom.net|alfred@freebsd.org]


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