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Date:      Thu, 10 Dec 1998 15:14:44 +1030
From:      Greg Lehey <grog@lemis.com>
To:        Briang <brian@briang.org>, FreeBSD <freebsd-questions@FreeBSD.ORG>
Subject:   Re: What does this mean ?
Message-ID:  <19981210151444.Z12688@freebie.lemis.com>
In-Reply-To: <007801be23f7$6fbe7680$2900a8c0@brian-desktop.briang.org>; from Briang on Wed, Dec 09, 1998 at 08:41:17PM -0800
References:  <007801be23f7$6fbe7680$2900a8c0@brian-desktop.briang.org>

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On Wednesday,  9 December 1998 at 20:41:17 -0800, Briang wrote:
> Dec  9 21:02:07 dns2 /kernel: arp: 192.168.0.41 is on tl1 but got reply from 00:80:5f:6f:7f:eb on tl0
> Dec  9 21:09:43 dns2 /kernel: arp: 192.168.0.41 is on tl1 but got reply from 00:80:5f:6f:7f:eb on tl0
> Dec  9 21:09:55 dns2 /kernel: arp: 192.168.0.41 is on tl1 but got reply from 00:80:5f:6f:7f:eb on tl0

Although it's correct to wrap normal text at about 70 characters,
please don't do this for log messages.  It's easier to read them in
full length.

> Why does this say xxx.41 is on TL1, and got reply from TL0 -> has
> 10.26.200.1 on it
> I get these errors every ten mins.

This depends a bit on your network topology.

> dns2# arp -a
> ? (192.168.0.1) at 0:8:c7:72:1d:e3
> ? (192.168.0.41) at 0:80:5f:6f:7f:eb
>
> dns2# ifconfig -a
> tl0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
>         inet 10.26.200.1 netmask 0xffffff00 broadcast 10.26.200.255
>         ether 00:80:5f:e6:92:2c
>         media: autoselect (10baseT/UTP <half-duplex>)
>         supported media: 100baseTX <full-duplex> 100baseTX <half-duplex>
> 100baseTX 10baseT/UTP <full-duplex> autoselect 10base5/AUI

This shows that tl0 handles a sub-class-A network 10.26.200.x.

> tl1: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
>         inet 192.168.0.94 netmask 0xffffff00 broadcast 192.168.0.255
>         ether 00:80:5f:e6:92:ac
>         media: autoselect (10baseT/UTP <half-duplex>)
>         supported media: 100baseTX <full-duplex> 100baseTX <half-duplex>
> 100baseTX 10baseT/UTP <full-duplex> autoselect 10base5/AUI

And, much more importantly, tl1 handles class C net 192.168.200.x.
Any data from this network should come in on this network.

> lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384
>         inet 127.0.0.1 netmask 0xff000000

So basically, the question is to you: how come you're getting a
physical (arp) connection from this machine on the wrong interface?

Greg
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