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	<title>CiscoZine &#187; BGP</title>
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		<title>BGP best path selection</title>
		<link>http://www.ciscozine.com/2009/05/19/bgp-best-path-selection/</link>
		<comments>http://www.ciscozine.com/2009/05/19/bgp-best-path-selection/#comments</comments>
		<pubDate>Tue, 19 May 2009 21:06:10 +0000</pubDate>
		<dc:creator>Fabio Semperboni</dc:creator>
				<category><![CDATA[Tutorial]]></category>
		<category><![CDATA[BGP]]></category>
		<category><![CDATA[Path selection]]></category>
		<category><![CDATA[Routing]]></category>

		<guid isPermaLink="false">http://www.ciscozine.com/?p=710</guid>
		<description><![CDATA[The Border Gateway Protocol (BGP) is an interautonomous system routing protocol. An autonomous system is a network or group of networks under a common administration and with common routing policies. BGP is used to exchange routing information for the Internet and is the protocol used between Internet service providers (ISP). BGP is used between autonomous systems (AS), the protocol is referred to as External BGP (EBGP). If a service provider is using BGP to exchange routes within an AS, then the protocol is referred to as Interior BGP (IBGP). BGP is a very robust and scalable routing protocol, as evidenced [...]]]></description>
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		<title>BGP MiTM attacks</title>
		<link>http://www.ciscozine.com/2009/03/06/bgp-mitm-attacks/</link>
		<comments>http://www.ciscozine.com/2009/03/06/bgp-mitm-attacks/#comments</comments>
		<pubDate>Fri, 06 Mar 2009 20:59:20 +0000</pubDate>
		<dc:creator>Fabio Semperboni</dc:creator>
				<category><![CDATA[Stories]]></category>
		<category><![CDATA[BGP]]></category>
		<category><![CDATA[MiTM]]></category>

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		<description><![CDATA[Surfing the web, I have found a nice article about BGP weakness. This document, entitled &#8220;Defending Against BGP Man-In-The-Middle Attacks&#8220;, was presented by Earl Zmijewski during Black Hat DC 2009 (Hyatt Regency Crystal City &#8211; February 16-17 &#8211; Arlington, Virginia). The slides focus on four points: BGP Routing Basics &#8211; Enough to understand and identify the threat BGP Update Messages BGP Attributes Some real examples The Man-In-The-Middle Attack: How BGP MiTM attack work What are the techniques used by an attacker to &#8220;tune&#8221; the attack (Obscuring the MITM attack with TTL adjustment) Detecting the Attack &#8211; Methods for observing the attack [...]]]></description>
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