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Joe, if you follow through the article http://www.ripe.net/news/study-youtube-hijacking.html.
AS36561 (YouTube) is announcing 208.65.153.0/25 and 208.65.153.128/25 but less visible on the Internet because there are some providers who do not have a proper filtering to reject 0.0.0.0/0 ge 25. In this case, AS3549 is accepting those /25 prefixes and propagating out which is not suppose to do so.
Look at the graph under Since Sunday, 24 February 2008, 20:18 (UTC), It is individual providers to make an effort not to accept and propagate small prefixes (/25 - /32).
My guess is, YouTube engineers may try to steer the /24 prefix back by thinking of generating more specified /25 prefixes, hoping it will fix it. This will not work for providers who comply to no smaller prefixes policy.
Isn’t is an implicit understanding of all peerings not to send /25 prefixes out?
It takes 2 hands to clap to make things better or worst.
On Sat, Mar 1, 2008 at 8:13 AM, Joseph Brunner wrote: > Scott, re “the youtube engineer’s fix” from the ripe page of advertising 2 > /25’s to be longer prefix matches then the /24 pakistan was hijacking- > > Don’t most providers deny 0.0.0.0/0 ge 25 > > Anyway? > > Who accepted a /25? > > Or all these years have I been fooled into thinking only > 0.0.0.0/0 le 24 will work? > > Thanks, > > Joe > > > —–Original Message—– > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of > > > Scott Morris > Sent: Friday, February 29, 2008 1:25 PM > To: ‘Shawn Zandi’; ‘Cisco certification’ > Subject: RE: Youtube BGP/IP hijacked > > This is why filtering in BGP (in and out) is a good idea. But also a > demonstration of lack-of-BGP skills on a global basis! > > Marketing opportunity? > > > Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713, JNCIE-M > #153, JNCIS-ER, CISSP, et al. > CCSI/JNCI-M/JNCI-ER > VP - Technical Training - IPexpert, Inc. > IPexpert Sr. Technical Instructor > > A Cisco Learning Partner - We Accept Learning Credits! > > smorris@ipexpert.com > > > > Telephone: +1.810.326.1444 > Fax: +1.810.454.0130 > http://www.ipexpert.com > > > > > > —–Original Message—– > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of > Shawn Zandi > Sent: Friday, February 29, 2008 12:56 PM > To: Cisco certification > Subject: Youtube BGP/IP hijacked > > As you may be aware from recent news reports, traffic to the youtube.com > website was ‘hijacked’ on a global scale on Sunday, 24 February 2008. > The incident was a result of the unauthorized BGP announcement of the prefix > 208.65.153.0/24 and caused the popular video sharing website to become > unreachable from most, if not all, of the Internet. > http://www.ripe.net/news/study-youtube-hijacking.html > > Shawn Zandi > www.shafagh.com > > _______________________________________________________________________ > Subscription information may be found at: > http://www.groupstudy.com/list/CCIELab.html > > _______________________________________________________________________ > Subscription information may be found at: > http://www.groupstudy.com/list/CCIELab.html > > _______________________________________________________________________ > Subscription information may be found at: > http://www.groupstudy.com/list/CCIELab.html