[52603] in North American Network Operators' Group
RE: iBGP next hop and multi-access media
daemon@ATHENA.MIT.EDU (Jason Lixfeld)
Mon Oct 7 00:49:27 2002
From: "Jason Lixfeld" <jlixfeld@andromedas.com>
To: "'Ralph Doncaster'" <ralph@istop.com>,
"'Alex Rubenstein'" <alex@nac.net>
Cc: <nanog@merit.edu>
Date: Mon, 7 Oct 2002 00:46:56 -0400
In-Reply-To: <Pine.LNX.4.21.0210070040440.4253-100000@ns.istop.com>
Errors-To: owner-nanog-outgoing@merit.edu
Are you just asking a question to get a better understanding of how
things work, Ralph or have you already put this into production and are
wondering why it doesn't work a certain way?
> -----Original Message-----
> From: owner-nanog@merit.edu [mailto:owner-nanog@merit.edu] On
> Behalf Of Ralph Doncaster
> Sent: Monday, October 07, 2002 12:43 AM
> To: Alex Rubenstein
> Cc: nanog@merit.edu
> Subject: Re: iBGP next hop and multi-access media
>
>
>
> My understanding is the route is valid as long as the interface is
> up; just like adding a secondary IP on the interface.
>
> Ralph Doncaster
> principal, IStop.com
>
> On Mon, 7 Oct 2002, Alex Rubenstein wrote:
>
> >
> > Aha.
> >
> > So, if you route to a ethernet interface, it will try to
> arp for that
> > address on that subnet, even without having a local address
> on the same
> > subnet?
> >
> > This seems to me to be something you don't want to do.
> >
> > Is the entire route valid as long as the router can ARP for
> one of the
> > addresses in the routed subnet?
> >
> >
> >
> > On Mon, 7 Oct 2002, Ralph Doncaster wrote:
> >
> > > On Mon, 7 Oct 2002, Alex Rubenstein wrote:
> > >
> > > > I've been doing ip route statements going on 8 years
> now, and I can't
> > > > imagine why ever -- and how it would even work -- you'd
> want to ip route a
> > > > netblock with a next hop of a multi-access brandcast
> media. As in, the
> > > > next hop is still truly undetermined.
> > > >
> > > > I guess I don't know this because I've never tried it.
> But, how does the
> > > > router determine where to send the packets for a route
> statement as
> > > > specified above (ip route a.b.c.d e.f.g.h f0/0) ?
> > >
> > > When you setup a secondary ip on an interface
> > > int fa0/0
> > > ip address a.b.c.d e.f.g.h secondary
> > >
> > > How does it determine where to send the packets? ARP.
> > > Which is the same as adding the route described above.
> > >
> > > -Ralph
> > >
> >
> > -- Alex Rubenstein, AR97, K2AHR, alex@nac.net, latency, Al Reuben --
> > -- Net Access Corporation, 800-NET-ME-36, http://www.nac.net --
> >
> >
> >
>
