Have Yahoo! gone pink?

Jon Lewis jlewis at lewis.org
Wed Mar 29 22:51:11 UTC 2006


On Wed, 29 Mar 2006 Valdis.Kletnieks at vt.edu wrote:

> Received: from EXCHG01-DUB.Europe.Search.Corpsys.P4pnet.net
> (cluster01-dub.europe.search.corpsys.p4pnet.net [172.30.132.19])
> 	by mrout3.yahoo.com (8.13.4/8.13.4/y.out) with ESMTP id k2FIupeH049008;
> 	Wed, 15 Mar 2006 10:56:52 -0800 (PST)
>
> Hey, what do you know... if you trust both uksolutions.net and yahoo.com's
> Received: lines, it didn't originate at Yahoo - it came from p4pnet.net. ;)
>
> (A fine demonstration of the difference between being truthful and being 
> helpful :)

Only problem with that is 172.30.132.19 is part of
NetRange:   172.16.0.0 - 172.31.255.255
CIDR:       172.16.0.0/12
NetName:    IANA-BBLK-RESERVED

So even if you did trust that Received line, it still had to come from 
inside yahoo.com (unless someone briefly announced some of 172.16.0.0/12 
and yahoo both accepted the route and relayed for it).

AFAIK, from other lists, Yahoo is aware of this screwup (disclaiming 
responsibility for 216.145.48.0/20) and is working on it.

----------------------------------------------------------------------
  Jon Lewis                   |  I route
  Senior Network Engineer     |  therefore you are
  Atlantic Net                |
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