How?????
This link has been bookmarked by 15 people . It was first bookmarked on 25 Feb 2008, by sudhang.
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29 Feb 08
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27 Feb 08
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26 Feb 08
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25 Feb 08
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Leo Laportethe only thing that prevents things like this from happening are the filters that everyone sets up for their own address blocks, and filters that ISPs apply to their BGP-capable customers manually.
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packets sent to YouTube were flowing to Pakistan
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Pakistan government had just instituted a ban on the popular video sharing site
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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
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Add Sticky Noteescaped from Pakistan Telecom to its ISP PCCW in Hong Kong, which propagated the route to the rest of the world
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Classless Inter-Domain Routing (CIDR)
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CIDR allows address blocks to be given out in power of two blocks
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The number after the slash indicates how many of the 32 address bits are "network" bits, the remaining bits are used to number hosts.
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a particular IP address can now fall within multiple address ranges.
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Add Sticky NoteSo even though YouTube's routing information was still there, packets would flow towards Pakistan Telecom because of the longest match first rule.
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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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Public Stiky Notes
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