[AusNOG] International link issue

Aaron Swayn aaron at swayn.com
Fri Feb 24 11:19:43 EST 2012

I think the spin was from Dodo to blame the vendor, but me thinks the fault
went down something like this.


-          Dodo engineer troubleshooting BGP advertisement issue

-          Can't figure it out (can't see why, these things do work properly
and you can debug them easily enough without having to take risks)

-          Removed outbound route filter from BGP session to Telstra to see
if that fixes the problem


And we know the rest.


From: ausnog-bounces at lists.ausnog.net
[mailto:ausnog-bounces at lists.ausnog.net] On Behalf Of Evan Weston
Sent: Friday, 24 February 2012 10:55 AM
To: ausnog at ausnog.net
Subject: Re: [AusNOG] International link issue


Nice spin from Telstra. Blame the hardware vendor, blame the customer but
never admit that it was actually *our fault* for not filtering properly.


From: ausnog-bounces at lists.ausnog.net
[mailto:ausnog-bounces at lists.ausnog.net] On Behalf Of Will Tardy
Sent: Friday, 24 February 2012 10:30 AM
To: ausnog at ausnog.net
Subject: Re: [AusNOG] International link issue


Telstra claims they had an international link down:




If that happened at the same time as DODO incorrectly sending Telstra the
full BGP table, could that explain why Telstra black-holed all-routes plus
pumped all of it's own traffic via dodo?

On 24 February 2012 10:02, Wade Millican <Wade.Millican at echoent.com.au>

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? 


*>         100     80      0 1221 38285 7474
7473 55410 45528 i
*>         100     80      0 1221 38285 7474
7473 55410 45528 i
*>         100     80      0 1221 38285 7474
7473 55410 45528 i
*>         100     80      0 1221 38285 7474
7473 6453 4755 45528 i
*>         100     80      0 1221 38285 7474
7473 6453 4755 45528 i
*         100     80      0 1221 38285
18398 7545 7545 i






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

2 Edward St
Pyrmont NSW 2009 

T: +61 2 9657 7460 <tel:%2B61%202%209657%207460> 
M: +61 (0) 400 192 485 <tel:%2B61%20%280%29%20400%20192%20485> 
wade.millican at echoent.com.au

From: "Ramsay, Paul" <pramsay at uecomm.com.au>
Date: Wed, 22 Feb 2012 22:20:41 -0800
To: "ausnog at ausnog.net" <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] On Behalf Of Sean K. Finn
Sent: Thursday, 23 February 2012 5:09 PM
To: '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


Over and Out.



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