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Re: Anyone notice strange announcements for 174.128.31.0/24
From: Joe Provo <nanog-post () rsuc gweep net>
Date: Mon, 12 Jan 2009 17:23:22 -0500

On Mon, Jan 12, 2009 at 04:51:36PM -0500, Joe Abley wrote:
[snip]
In my experience prepending someone else's AS to a prefix has only  
been useful operationally only as a short-term, emergency measure  
(e.g. when trying to avoid a black-hole between two remote ASes,  
neither of whom shows any signs of fixing the problem).

Randy's application, and Lorenzo's before him also seem like short- 
term applications designed to explore answering operational questions.

Nit, weird paths (this one) and long paths (Lorenzo's) are different.
There were known BGP implementations which choked and died on long
as-paths, which (w|c)ould trigger outages. Weird paths which appear
to involve your network triggers -at least- work.

Just because something is generally not used, or even if it's only  
worth using in an emergency, doesn't make it "sketchy".

Given the prevalence of BGP community-based remote control over your
direct neighbor's neighbors, it has seemed to (to me) to decrease. 
Using a label allocated to someone else does indeed seem sketchy to 
many of us; while the injector knows they are doing it and the injectee
can figure it out, there's a heck of a lot of other parties (and 
archives) without context. Encouraging the use of such approaches, 
rather than encouraging providers to provision customers without the 
ability to forge AS paths, is a step in the wrong direction. 

Most knee-jerk reactions to AS_PATH manipulation sound to me like fear  
of the unusual.
 
Less fear and more annoyance; the waters are muddied and the unusual 
requires investigation, and in some cases explanation internally &
externally.  Propagating bad table hygiene doesn't promote network 
use, increase stability/robustness, or anything that could be viewed 
as best practice.

All IMO, of course.

Cheers,

Joe
-- 
             RSUC / GweepNet / Spunk / FnB / Usenix / SAGE


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