Insecure routing redirects YouTube to Pakistan - The Diigo Meta page

• 28 Feb 08
  

  Geraldo Medrano

  This routing information escaped from Pakistan Telecom to its ISP PCCW in Hong Kong, which propagated the route to the rest of the world

  dns networking

• 26 Feb 08
  

  Joel Liu

  routing youtube

• 

  CK Lee

  info network protocol type:article

• 

  Suvi-Tuuli Mäki-Asiala

  articles censorship internet technology Youtube

• 25 Feb 08
  

  M G
• 

  sudhang
  • packets sent to YouTube were flowing to Pakistan
  • Pakistan government had just instituted a ban on the popular video sharing site
  • 7 more annotations...
  • • Pakistan Telecom routed the address block that YouTube's servers are in to a "black hole" as a simple measure to filter access to the service
    • escaped from Pakistan Telecom to its ISP PCCW in Hong Kong, which propagated the route to the rest of the world

      • 

        sudhang on 2008-02-25

        How?????
    • Classless Inter-Domain Routing (CIDR)
    • CIDR allows address blocks to be given out in power of two blocks
    • The number after the slash indicates how many of the 32 address bits are "network" bits, the remaining bits are used to number hosts.
    • a particular IP address can now fall within multiple address ranges.
    • So even though YouTube's routing information was still there, packets would flow towards Pakistan Telecom because of the longest match first rule.

      • 

        sudhang on 2008-02-25

        Since the range specified by Pakistan Telecom was narrower, routers gave precedence to the Pakistan Telecom... So, packets intended for YouTube made their way to PT instead!!

Public Stiky Notes

• 
  sudhang on 2008-02-25
  How?????
• 
  sudhang on 2008-02-25
  Since the range specified by Pakistan Telecom was narrower, routers gave precedence to the Pakistan Telecom... So, packets intended for YouTube made their way to PT instead!!

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