Hi, On Mon, Nov 28, 2011 at 06:44:48PM -0500, Keegan Holley wrote: > 2011/11/28 Gert Doering <[email protected]> > > On Mon, Nov 28, 2011 at 11:41:08AM -0500, Keegan Holley wrote: > > > That wasn't centered around aggregates and no. Some of us don't run > > > gigantic intercontinental ISP's :) So yes us lowly Tier-II and Tier-III > > > AS's may on occasion learn our own routes from an external connection. > > > > These lowly ASes urgently need to implement anti-bogon filters on their > > eBGP sessions. NEVER EVER accept prefixes belonging to your address > > space from the outside. > > That's crap.
In that case: "I encourage all my competitors to do so".
What's your AS number? Shall we see what happens if I announce the /24
with your name servers in it? (Except that I'm a good guy, and would
never do that, of course).
> You will need to do it to have customers multi-home with your
> ARIN space for one. Secondly those outside AS's may belong to your company
> a sister company or an acquisition and you may want to use the eBGP path as
> a backup.
Of course there are valid exceptions. But they should be *exceptions*.
ASes relying on "nobody will do that" or (even worse) relying on vague
and ill-understood BGP preferences will just feel the pain some day.
gert
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Gert Doering - Munich, Germany [email protected]
fax: +49-89-35655025 [email protected]
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