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Date:      Tue, 02 Jan 2001 12:49:15 -0500
From:      =?iso-8859-1?Q?F=E9lix-Antoine?= Paradis <reel@sympatico.ca>
To:        Wes Peters <wes@softweyr.com>
Cc:        hackers@freebsd.org
Subject:   Re: ARP question.
Message-ID:  <5.0.2.1.0.20010102124838.009efec0@pop6.sympatico.ca>
In-Reply-To: <3A520604.39F63679@softweyr.com>
References:  <5.0.2.1.0.20010102023010.00a101f0@pop6.sympatico.ca>

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At 09:47 01-01-02 -0700, you wrote:
>F=E9lix-Antoine Paradis wrote:
> >
> > Hi,
> >       When we do a "dmesg" on a 4.2-STABLE box, we get:
> >
> > arp: 200.42.126.18 moved from 00:e0:7d:7b:53:f0 to 00:c0:df:f4:ac:05 on=
 ed0
>
>This means exactly what is says: IP address 200.42.126.18 was originally
>associated with ethernet MAC address ...:53:f0, but has moved to ...:ac:05.
> >
> > and, in ifconfig, it says:
> >
> > ed0: flags=3D8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
> >           inet 200.42.126.20 netmask 0xffffff00 broadcast 200.42.126.255
> >           inet6 fe80::2e0:7dff:fe7b:548a%ed0 prefixlen 64 scopeid 0x1
> >           ether 00:e0:7d:7b:54:8a
> >
> > ed0 is connected to a switch. we want to know what the "arp: " message
> > means. on the linux box, we have:
> >
> > eth0      Link encap:Ethernet  HWaddr 00:C0:DF:F4:AC:05
> >            inet=20
> addr:200.42.126.18  Bcast:200.42.126.23  Mask:255.255.255.248
>
>Yes, this interface is now showing what ARP reported above.
>
> > eth1      Link encap:Ethernet  HWaddr 00:E0:7D:7B:53:F0
> >             inet addr:192.168.1.1  Bcast:192.168.1.255 =
 Mask:255.255.255.0
>
>And this one is not.
>
> > Both eth0 and eth1 are connected to that same switch.
>
>Did the Linux box reboot when you got the ARP message?  If so, the Linux
>box has reversed the order of the ethernet interfaces.  If not, the Linux
>box is routing packets over the wrong interface, which can happen when you
>have two networks mingled together like this.  What kind of switch is this?

It is a Catalyst 2900 XL Series


>--
>             "Where am I, and what am I doing in this handbasket?"
>
>Wes=20
>Peters                                                         Softweyr LLC
>wes@softweyr.com=20
>http://softweyr.com/
>
>
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