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UNCLASSIFIED Future Issues in Router Security Version 1.0g  UNCLASSIFIED 213   [10] Townsley, V., Rubens, P., Zorn, P., “Layer Two Tunneling Protocol (L2TP),” RFC 2661, 1999. Definition of the Internet standard tunneling protocol, including discussion of the relationships of IP, PPP, and L2TP. [11] Black, U., PPP and L2TP, Prentice-Hall, 2000. A very detailed overview of remote access and layer 2 tunneling, including some coverage of security options.