[52610] in North American Network Operators' Group
Re: iBGP next hop and multi-access media
daemon@ATHENA.MIT.EDU (Stephen J. Wilcox)
Mon Oct 7 08:06:58 2002
Date: Mon, 7 Oct 2002 13:08:03 +0100 (BST)
From: "Stephen J. Wilcox" <steve@telecomplete.co.uk>
To: Jared Mauch <jared@puck.Nether.net>
Cc: Alex Rubenstein <alex@nac.net>,
Ralph Doncaster <ralph@istop.com>,
"jlewis@lewis.org" <jlewis@lewis.org>,
"E.B. Dreger" <eddy+public+spam@noc.everquick.net>,
"nanog@merit.edu" <nanog@merit.edu>
In-Reply-To: <20021007045924.GA22401@puck.nether.net>
Errors-To: owner-nanog-outgoing@merit.edu
Proxy arp will still send the data thro the other router tho, the only
difference is now router B believes router A to be the destination
station. Seems like your worse off than you were before. (Plus I hate proxy arp
in non-SOHO environments!)
Steve
--
Stephen J. Wilcox
BSc (Hons), CCNA, CCNP, CCIE wr.
Technical Director, Telecomplete
http://www.telecomplete.co.uk/
On Mon, 7 Oct 2002, Jared Mauch wrote:
>
> On Mon, Oct 07, 2002 at 12:15:40AM -0400, Alex Rubenstein wrote:
> >
> >
> > OK, I'll bite.
> >
> > 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) ?
>
> A cisco router with the default (ip proxy-arp) enabled on
> the interface will spend all its time doing arp/proxy-arp for the hosts and
> it will actually work believe it or not.
>
> You'll notice massive cpu utilization.
>
> People who do this tend to not have a lot of clue or notice
> when their cpu is spending all its time doing this... One should
> always turn proxy-arp off on your interfaces both internal and customer
> facing so they don't make your router bear the load because they can
> not configure their devices logically.
>
> - Jared
>
> > > So then what do you call a connected route (for an ethernet interface on a
> > > router)? If you use ethernet, at the edges of your network you HAVE to
> > > route IP blocks to the ethernet.
> > >
> > > -Ralph
> > >
> >
> > -- Alex Rubenstein, AR97, K2AHR, alex@nac.net, latency, Al Reuben --
> > -- Net Access Corporation, 800-NET-ME-36, http://www.nac.net --
> >
>
>
