[AusNOG] International link issue

Fri Feb 24 10:02:39 EST 2012

Hi All,

What I'm yet to understand about this outage is why DODO's AS_PATH was seen as shorter than anything Telstra already had.

An earlier posted look at routes(below), thanks Gavin, shows all routes from Telstra taking hops to DODO, then Optus or PIPE before moving to the destination. Surely Telstra would have had better routes than pushing all traffic 2 hops out of it's way.

AS_PATH does not explain how Telstra accepted these as the active routes. Even if all routes were accepted, Telstra still has better routes.

Can anyone explain what BGP Metric was modified/used that pushed traffic over longer AS_PATHs?

*> 1.22.161.0/24    165.228.157.73         100     80      0 1221 38285 7474 7473 55410 45528 i
*> 1.22.162.0/24    165.228.157.73         100     80      0 1221 38285 7474 7473 55410 45528 i
*> 1.22.163.0/24    165.228.157.73         100     80      0 1221 38285 7474 7473 55410 45528 i
*> 1.22.167.0/24    165.228.157.73         100     80      0 1221 38285 7474 7473 6453 4755 45528 i
*> 1.22.168.0/24    165.228.157.73         100     80      0 1221 38285 7474 7473 6453 4755 45528 i
..
*  14.201.64.0/24   165.228.157.73         100     80      0 1221 38285 18398 7545 7545 i

Thanks,

Wade
--
Wade Millican
Technical Consultant Team Lead
Hemisphere Infrastructure Support
Information Technology
Echo Entertainment Group Limited

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[cid:CD2E67E1-5240-46BC-ACBE-12D129319FA0]
From: "Ramsay, Paul" <pramsay at uecomm.com.au<mailto:pramsay at uecomm.com.au>>
Date: Wed, 22 Feb 2012 22:20:41 -0800
To: "ausnog at ausnog.net<mailto:ausnog at ausnog.net>" <ausnog at ausnog.net<mailto:ausnog at ausnog.net>>
Subject: Re: [AusNOG] International link issue

Yes, this reinforces the Rule of Trust. Don’t trust your BGP peers and ensure your filters are in place, configured correctly and working, you can’t transfer blame.
It can cost you big $$ and pain if you inadvertently turn yourself into a transit peer because your upstreams may prefer to send traffic where they can make $$ from.

From: ausnog-bounces at lists.ausnog.net<mailto:ausnog-bounces at lists.ausnog.net> [mailto:ausnog-bounces at lists.ausnog.net] On Behalf Of Sean K. Finn
Sent: Thursday, 23 February 2012 5:09 PM
To: 'ausnog at ausnog.net<mailto:'ausnog at ausnog.net>'
Subject: Re: [AusNOG] International link issue

It’s easy to describe for all the media types watching..
(And I’m not sure why its not being put out there in Laymans terms).

>From the routes seen at various points, and reported on the WAIX mailing list earlier..

Dodo told Telstra that Dodo was the rest of the Internet.

Telstra Believed Dodo.

Telstra entire system tried to use DODO as their ISP instead of everyone else Telstra is connected to.

Needless to say this didn’t work, the pipes got Jammed.

Telstra should have filtered the announcement from Dodo, butdidn’t.

Filtering is in place as a form of control (which is used instead of trust).

Filtering obviously wasn’t in place, or didn’t work, so anything that Dodo told Telstra about where to find the Internet, Telstra believed.

This happens quite often, I’ve heard of this happening on peering exchanges within Australia, too. Just never at an organizational level as big as Telstra.

Over and Out.

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