[AusNOG] International link issue
Matt Perkins
matt at spectrum.com.au
Fri Feb 24 11:56:47 EST 2012
I think the reason Telstra used the dodo path rather then it's others is
because of their well debated and arguably incorrect policy to fiddle
the localpref's to preference directly connected customers .
This goes back to the Geoff Huston days where Telstra have allways
perfered a route to any customer that is connected locally. I Assume
there original plan was to allays keep it on net if possible, to make as
much revenue from on net customers.
There where many arguments of the time calming all sorts of armageddon
scenarios. Looks like some of us were right.
>> *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>
>> [mailto:ausnog-bounces at lists.ausnog.net]
>> <mailto:[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 <mailto:ausnog at ausnog.net>
>> *Subject:* Re: [AusNOG] International link issue
>>
>> Telstra claims they had an international link down:
>>
>> http://www.zdnet.com.au/telstra-hit-by-nationwide-data-outage-339332310.htm
>>
>> 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 <mailto:Wade.Millican at echoent.com.au>>
>> wrote:
>>
>> 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 <http://1.22.161.0/24> 165.228.157.73 100 80 0 1221 38285 7474 7473 55410 45528 i
>> *> 1.22.162.0/24 <http://1.22.162.0/24> 165.228.157.73 100 80 0 1221 38285 7474 7473 55410 45528 i
>> *> 1.22.163.0/24 <http://1.22.163.0/24> 165.228.157.73 100 80 0 1221 38285 7474 7473 55410 45528 i
>> *> 1.22.167.0/24 <http://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 <http://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 <http://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*
>>
>> 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 <mailto:wade.millican at echoent.com.au>
>> _www.echoentertainment.com.au <http://www.echoentertainment.com.au>
>>
>> *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:%27ausnog 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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