[Outages-discussion] [outages] DNS resolution of ebay.com - routing loop

[Frank Bulk - iName.com]

Yes the Sprint bomb got them all, but perhaps eBay anycasts that prefix and
eBay also can't control who gets transit from whom -- there's only so much
TE one can do.

>From our perspective all of eBay's nameservers were accessed via Sprint (now
it's via Level3, but all traceroutes stop at
CenturyLink-level3-xe.dallas3.Level3.net (4.68.63.50)).

Frank

-----Original Message-----
From: outages-discussion-bounces at outages.org
[mailto:outages-discussion-bounces at outages.org] On Behalf Of Jay Ashworth
Sent: Tuesday, January 17, 2012 3:46 PM
To: outages-discussion
Subject: Re: [Outages-discussion] [outages] DNS resolution of ebay.com -
routing loop

----- Original Message -----
> From: "Frank Bulk - iName.com" <frnkblk at iname.com>

> Update -- there's a routing loop between our upstream provider and
> Sprint. Hence the lack of DNS resolution. =)
>
> nagios:/home/fbulk# tcptraceroute 66.135.207.137
> Selected device eth0.3, address 96.31.0.5, port 39237 for outgoing
> packets
> Tracing the path to 66.135.207.137 on TCP port 80 (www), 30 hops max
> ...

[ trace of unusual 4-hop routing loop elided ]

So, does this mean that eBay's DNS is deployed in a fashion where one bomb
can get them all, from your viewpoint?  I assume that if you were off-net
completely, you would have been reporting something different, if at all.

Cheers,
-- jra
--
Jay R. Ashworth                  Baylink
jra at baylink.com
Designer                     The Things I Think                       RFC
2100
Ashworth & Associates     http://baylink.pitas.com         2000 Land Rover
DII
St Petersburg FL USA      http://photo.imageinc.us             +1 727 647
1274
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