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Posted Apr 22, 2004 16:18 UTC (Thu) by vondo (guest, #256)
Parent article: TCP vulnerability: cancel red alert

Thanks for a very clear explanation; I've sort of gleaned lots of this from other sources, but it's nice to see it all in one place. Now what I don't understand much at all is 1) What is BGP and 2) Why is it so vulnerable to this attack. That'd make another great LWN article, I think.



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What is BGP?

Posted Apr 22, 2004 18:09 UTC (Thu) by pflugstad (subscriber, #224) [Link]

In short: BGP (specifically BGP-4) is *the* routing protocol used on the Internet. Think of it as the great-great-great grandnephew of RIP. Network Service Providers and Internet Service Providers use it to advertise IP address reachability to each other. Routers run the protocol between themselves over TCP connections. It's not all that vulnerable to attack - it's biggest problem is that it can be extremely complex to configure properly, which can lead to routing problems across the Internet.

BGP-4 is a standard from the IETF.

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