Preface7Related documentsRFC 791, Internet Protocol, IETF, September 1981.RFC 1191, Path MTU Discovery, IETF, November 1990.RFC 1305, Network Time Protocol (Version 3), IETF, March 1992.RFC 1321, The MD5 Message‐Digest Algorithm, IETF, April 1992.RFC 1777, Lightweight Directory Access Protocol, IETF, March 1995.RFC 1918, Address Allocation for Private Internets, IETF, February 1996.RFC 2030, Simple Network Time Protocol (SNTP) Version 4 for IPv4, IPv6 and OSI, IETF,October 1996.RFC 2138, Remote Authentication Dial In User Service (RADIUS), IETF, April 1997.RFC 2139, RADIUS Accounting, IETF, April 1997.RFC 2251, Lightweight Directory Access Protocol (v3), IETF, December 1997.RFC 2401, Security Architecture for the Internet Protocol, IETF, November 1998.RFC 2406, IP Encapsulating Security Payload (ESP), IETF, November 1998.RFC 2460, Internet Protocol, Version 6 (IPv6) Specification, IETF, December 1998.RFC 3947, Negotiation of NAT‐Traversal in the IKE, IETF, January 2005.RFC 4306, Internet Key Exchange (IKEv2) Protocol, IETF, December 2005.RFC 5905, Network Time Protocol Version 4: Protocol and Algorithms Specification, IETF, June2010.Notational conventionsThis manual uses the following conventionsAll numbers are decimal unless otherwise stated.ItalicText File, function, and utility names.MonoText Screen text and syntax strings.BoldMonoText A command to enter.ItalicMonoText Variable parameters.Brackets [ ] Command options.Curly braces { } A grouped list of parameters.Vertical line | An “OR” in the syntax. Indicates a choice of parameters.