[3643] in North American Network Operators' Group
Re: totd
daemon@ATHENA.MIT.EDU (Avi Freedman)
Fri Aug 2 11:37:25 1996
From: Avi Freedman <freedman@netaxs.com>
To: rob@elite.exodus.net (Robert Bowman)
Date: Fri, 2 Aug 1996 11:32:39 -0400 (EDT)
Cc: bnite@tremere.ios.com, nanog@merit.edu
In-Reply-To: <199608021438.HAA00394@elite.exodus.net> from "Robert Bowman" at Aug 2, 96 07:38:02 am
> The biggest problem with using non-routable ip addresses on numbered interfaces
> whether point to point or frame or atm or whatever, is that you lose outside
> connectivity from those interfaces. We tried this, but the essential
> traceroutes from our core routes are too important when debugging BGP
> problems to the outside.
>
> Robert Bowman
> Exodus Communications Inc.
Exactly. Especially when you have downstream customers who only announce
routes via BGP to you and/or other providers, it can be important for them
to be able to trace out with a source address that has global connectivity.
We usually use unnumbered interfaces, though, for singly-connected customers
(unless their routers can't support unnumbered interfaces). The only
major gotcha with that is that if they're using a Real Router (that deleted
routes associated with interfaces that aren't available), you can't
get to their router if their ethernet is down...
Avi
