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The Internet is vulnerable to attack through its routing protocols and BGP is no exception. External sources can disrupt communications between BGP peers by breaking their TCP connection with spoofed RST packets. Internal sources, such as BGP speakers, can inject bogus routing information from any other legitimate BGP speaker. Bogus information from either external or internal sources can affect routing behavior over a wide area in the Internet.
The TCP MD5 option allows BGP to protect itself against the introduction of spoofed TCP segments into the connection stream. To spoof a connection using MD5 signed sessions, the attacker not only has to guess TCP sequence numbers, but also the password included in the MD5 digest.
