Date: Tue, 18 Sep 2001 22:00:42 -0500 (CDT) From: Mike Saunders <method@method.cx> To: freebsd-net@freebsd.org Subject: SOLVED - kernel arp messages Message-ID: <Pine.NEB.4.21.0109182150210.7793-100000@schizo.method.cx> In-Reply-To: <Pine.BSF.4.21.0109181856480.23317-100000@InterJet.elischer.org>
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On Tue, 18 Sep 2001, Julian Elischer wrote:
> Date: Tue, 18 Sep 2001 19:05:21 -0700 (PDT)
> From: Julian Elischer <julian@elischer.org>
> To: Mike Saunders <method@method.cx>
> Cc: Lars Eggert <larse@ISI.EDU>, freebsd-net@freebsd.org
> Subject: RE: kernel arp messages
>
>
> > > Date: Tue, 18 Sep 2001 17:31:24 -0800
> > > From: Lars Eggert <larse@ISI.EDU>
> > > To: Mike Saunders <method@method.cx>, freebsd-net@freebsd.org
> > > Subject: RE: kernel arp messages
> > >
> > > > Sep 18 15:01:54 router /kernel: arp: 209.74.87.1 is on lo0 but got reply
> > > > from 00:60:08:35:57:4e on xl0
> > >
> > > And this is *really* ugly! Are you proxy-arping? Someone is advertising
> > > one of your local IP addresses.
> >
>
> how did that address get on lo0?
> what is netstat -r (or ifconfig) showing?
That is a good question. I don't really know how, that's just what the
kernel tells me.
>
> > Actually Lars,
> > If you notice the MAC, it's the same as:
> >
> > ep0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
> > inet 209.74.87.1 netmask 0xffffff00 broadcast 209.74.87.255
> > ether 00:60:08:35:57:4e
> >
> > So 209.74.87.1 is on ep0 which is on lo0 but gets caught at xl0, according
> > to this machine.
>
>
> ep0 is NOT "ON" lo0
> What makes you say that strange thing?
>
>
What I meant was "This is what the machine is thinking." I know that ep0
is not "on" lo0.
>
>
> >
> > So maybe a picture will help
> >
> > |
> > |
> > |
> > 209.74.92/24
> > |
> > (xl0)
> > FreeBSD Router
> > (ep0)
> > |
> > 209.74.87/24
> > |
> > switches
> >
> > This is what I believe to be the current set up. Now that I read the
> > email mentioning the loop, it's possible that somebody has thrown in a hub
> > connecting both networks. I know there's one in the closet. I'll have to
> > go and check.
>
> that would be my guess.
>
> >
> > Ideally, all I'm trying to do is route one class C into my
>
> what is the link to the provider?
>
In return for a free T1 we do some co-location for our provider. There's
an 8-port hub that sits between my external interface and the
router. There's a few other machines and a bay networks access node
plugged into this hub. turns out somebody plugged a patch cable from this
hub (sitting on the provider's network) into our stack of switches. I
believe it was Chris that nailed this one on the head.
Thanks for the tips everybody. I've been looking at that for a long time,
I don't know how I missed that cable, or how it got there. So in reality,
the network setup looked like this.
provider
router
|-----------\
Hub |
| |
209.74.92/24 |
| |
(xl0) |
FreeBSD Router |
(ep0) |
| |
209.74.87/24 |
| /
switches------/
Once again, thanks for the quick replies and the help. It's much
appreciated.
-Mike Saunders
method@method.cx
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