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diff --git a/contrib/ntp/html/biblio.htm b/contrib/ntp/html/biblio.htm new file mode 100644 index 0000000..3396481 --- /dev/null +++ b/contrib/ntp/html/biblio.htm @@ -0,0 +1,259 @@ +<html><head><title> +Protocol Conformance Statement +</title></head><body><h3> +Protocol Conformance Statement +</h3> +<BR><IMG align=left SRC="pic/flatheads.gif">From <i>The +Wizard of Oz</i>, L. Frank Baum + +<p>Say it three times and it must be right. +<br clear=left> +<hr> + +<p>The Network Time Protocol (NTP) is used to synchronize the time of +a computer client or server to another server or reference time source, +such as a radio or satellite receiver or modem. It provides accuracies +typically within a millisecond on LANs up to a few tens of milliseconds +on WANs relative to Coordinated Universal Time (UTC), as provided by a +Global Positioning Service (GPS) receiver, for example. + +<p>Typical NTP configurations utilize multiple redundant servers and +diverse network paths, in order to achieve high accuracy and +reliability. Some configurations include cryptographic authentication to +prevent accidental or malicious protocol attacks. Information on the NTP +architecture, protocol and algorithms can be found in the following +articles and reports, which are available online. General issues of the +concepts and facilities assumed by NTP are discussed in tne <a +href=exec.htm>Executive Summary - Computer Network Time +Synchronization</a> page, while issues related to the NTP timescale and +pending century are discussed in the <A HREF=y2k.htm> Network Time +Protocol Year 2000 Conformance Statement</A> page, both of which are +included in this document. + +<p>Note that network timekeeping technology continues to advance and may +obsolete some of the following documents. For a current list of all +papers, reports, briefings and other documents relevant to the NTP +community, see the <a href=http://www.eecis.udel.edu/~mills>David L. +Mills</a> web page. + +<P>The NTP architecture, protocol and algorithm models are described in + +<UL> + +<li>Mills, D.L. Internet time synchronization: the Network Time +Protocol. <I>IEEE Trans. Communications COM-39, 10</I> (October 1991), +1482-1493. <A +HREF=http://www.eecis.udel.edu/~mills/database/papers/trans.ps> +PostScript</A> | <a +HREF=http://www.eecis.udel.edu/~mills/database/papers/trans.pdf> +PDF</a>. Also in: Yang, Z., and T.A. Marsland (Eds.). <I>Global States +and Time in Distributed Systems</I>. IEEE Computer Society Press, Los +Alamitos, CA, 1994, 91-102. +</UL> + +The NTP specification and implementation has evolved over the last two +decades to the current Version 4 of the protocol. This version includes +significant enhancements in accuracy and reliability, as determined by +experience in an estimated total of well over 100,000 clients and +servers in the Internet, while retaining backward compatibility with +previous versions. + +<P>This software distribution contains an implementation of the NTP +Version 4 architecture, protocol and algorithms. While a formal +specification of this version is not yet available, this version is +fully compliant with the previous NTP Version 3 specification and +implementation defined in +<UL> + +<li>Mills, D.L. Network Time Protocol (Version 3) specification, +implementation and analysis. Network Working Group Report RFC-1305, +University of Delaware, March 1992, 113 pp. Abstract: <A +HREF=http://www.eecis.udel.edu/~mills/database/rfc/rfc1305/rfc1305a.ps> +PostScript)</A> | <a +HREF=http://www.eecis.udel.edu/~mills/database/rfc/rfc1305/rfc1305a.pdf> +PDF</A>, Body: <a +HREF=http://www.eecis.udel.edu/~mills/database/rfc/rfc1305/rfc1305b.ps> +PostScript)</A> | <a +HREF=http://www.eecis.udel.edu/~mills/database/rfc/rfc1305/rfc1305b.pdf> +PDF</A>, Appendices: <A +HREF=http://www.eecis.udel.edu/~mills/database/rfc/rfc1305/rfc1305c.ps> +PostScript</a> | <a +HREF=http://www.eecis.udel.edu/~mills/database/rfc/rfc1305/rfc1305c.pdf> +PDF</A>. + +</UL> + +The NTP Version 4 implementation adds a number of extensions and +refinements to the previous version, including an autonomous +configuration and authentication capability, improved clock discipline +algorithms capable of submicrosecond accuracy and many other +refinements. Specific changes since the Version 3 specification was +issued include: + +<OL> + +<p><LI>Support for precision-time kernel modifications, as described +in</LI> + +<P>Mills, D.L. Unix kernel modifications for precision time +synchronization. Electrical Engineering Department Report 94-10-1, +University of Delaware, October 1994, 24 pp. Abstract: <A +HREF=http://www.eecis.udel.edu/~mills/database/reports/kern/kerna.ps> +PostScript</A> | <a +HREF=http://www.eecis.udel.edu/~mills/database/reports/kern/kerna.pdf> +PDF</a>, Body: <A +HREF=http://www.eecis.udel.edu/~mills/database/reports/kern/kernb.ps> +PostScript</A> | <a +HREF=http://www.eecis.udel.edu/~mills/database/reports/kern/kernb.pdf> +PDF</a>. Major revision and update of: Network Working Group Report +RFC-1589, University of Delaware, March 1994. 31 pp. <A +HREF=http://www.eecis.udel.edu/~mills/database/rfc/rfc1589.txt>ASCII</A> + +<p><LI>Support for IP Multicasting, as described in</LI> + +<P>Mills, D.L, and A. Thyagarajan. Network time protocol version 4 +proposed changes. Electrical Engineering Department Report 94-10-2, +University of Delaware, October 1994, 32 pp. Abstract: <A +HREF=http://www.eecis.udel.edu/~mills/database/reports/acts/actsa.ps> +PostScript</A> | <A +HREF=http://www.eecis.udel.edu/~mills/database/reports/acts/actsa.pdf> +PDF</A>, Body: <a +HREF=http://www.eecis.udel.edu/~mills/database/reports/acts/actsb.ps> +PostScript</A> | <a +HREF=http://www.eecis.udel.edu/~mills/database/reports/acts/actsb.pdf> +PDF</a> + +<p><LI>A new hybrid phase/frequency-lock clock discipline, which +replaces the RFC-1305 local clock algorithm, as described in</LI> + + +<P>Mills, D.L. Clock discipline algorithms for the Network Time Protocol +Version 4. Electrical Engineering Report 97-3-3, University of Delaware, +March 1997, 35 pp. Abstract: <A +HREF=http://www.eecis.udel.edu/~mills/database/reports/allan/securea.ps> +PostScript</A> | <a +HREF= +http://www.eecis.udel.edu/~mills/database/reports/allan/securea.pdf> +PDF</a>, Body: <A +HREF=http://www.eecis.udel.edu/~mills/database/reports/allan/secureb.ps> +PostScript</A> | <a +HREF= +http://www.eecis.udel.edu/~mills/database/reports/allan/secureb.pdf> +PDF</a> + +<P>Mills, D.L. Improved algorithms for synchronizing computer network +clocks. <I>IEEE/ACM Trans. Networks 3, 3</I> (June 1995), 245-254. <A +HREF=http://www.eecis.udel.edu/~mills/database/papers/tune2.ps> +PostScript</A> | <a +HREF=http://www.eecis.udel.edu/~mills/database/papers/tune2.pdf> +PDF</a> + +<P><LI>Engineered refinements to radio clock drivers and interface code, +as describedin:</LI> + +<P>Mills, D.L. Precision synchronization of computer network clocks. +<I>ACM Computer Communication Review 24, 2</I> (April 1994). 28-43. <A +HREF=http://www.eecis.udel.edu/~mills/database/papers/fine.ps> +PostScript</A> | <A +HREF=http://www.eecis.udel.edu/~mills/database/papers/fine.pdf> +PDF</a> + +<P><LI>Support for over two dozen reference clock drivers for all known +national and international radio, satellite and modem standard time +services known at this time. See the <A HREF=refclock.htm>Reference +Clock Drivers </A>page.</LI> + +<P><LI>A new security model and authentication scheme based on public- +key cryptography called <I>autokey</I>, as described in</LI> + +<P>Mills, D.L., T.S. Glassey, and M.E. McNeil. Coexistence and +interoperability of NTP authentication schemes. Internet Draft +draft-mills-ntp-auth-coexist-00.txt, University of Delaware and Coastek +InfoSys, Inc., November 1997, 8 pp. <A +HREF=http://www.eecis.udel.edu/~mills/memos/draft.txt>ASCII</A> + +<P>Mills, D.L. Authentication scheme for distributed, ubiquitous, real- +time protocols. <I>Proc. Advanced Telecommunications/Information +Distribution Research Program (ATIRP) Conference</I> (College Park MD, +January 1997), 293-298. <A +HREF=http://www.eecis.udel.edu/~mills/database/papers/atirp.ps> +PostScript</A> | <a +HREF=http://www.eecis.udel.edu/~mills/database/papers/atirp.pdf> +PDF</a> + +<P>Mills, D.L. Proposed authentication enhancements for the Network Time +Protocol version 4. Electrical Engineering Report 96-10-3, University of +Delaware, October 1996, 36 pp. Abstract: <A +HREF= +http://www.eecis.udel.edu/~mills/database/reports/secure/securea.ps> +PostScript</A> | <a +HREF= +http://www.eecis.udel.edu/~mills/database/reports/secure/securea.pdf> +PDF</a>, Body: <A +HREF= +http://www.eecis.udel.edu/~mills/database/reports/secure/secureb.ps> +PostScript</A> | <a +HREF= +http://www.eecis.udel.edu/~mills/database/reports/secure/secureb.pdf> +PDF</a> + +<P><LI> Support for the MD5 cryptographic hash algorithm, in addition to +the DES-CBC algorithm described in RFC-1305, as described in the <A +HREF=ntpd.htm><TT>ntpd</TT> - Network Time Protocol (NTP) daemon +</A>page.</LI> + +<P><LI>The prefer-peer scheme, as described in the <A +HREF=prefer.htm>Mitigation Rules and the <TT>prefer</TT> Keyword +</A>page.</LI> + +<P><LI>Specification for the Simple Network Time Protocol (SNTP), as +described in</LI> + +<P>Mills, D.L. Simple network time protocol (SNTP) version 4 for IPv4, +IPv6 and OSI. Network Working Group Report RFC-2030, University of +Delaware, October 1996, 18 pp. <A +HREF=http://www.eecis.udel.edu/~mills/database/rfc/rfc2030.txt> +ASCII</A>. Obsoletes RFC-1769 and RFC-1361. + +<P><LI>Performance surveys for NTP Version 4 can be found in</LI> + +<p><li>Mills, D.L., A. Thyagarajan and B.C. Huffman. Internet +timekeeping around the globe. <i>Proc. Precision Time and Time Interval +(PTTI) Applications and Planning Meeting</i> (Long Beach CA, December +1997), 365-371. Paper: <a +href=http://www.eecis.udel.edu/~mills/database/papers/survey5.ps> +PostScript</a> | <a +href=http://www.eecis.udel.edu/~mills/database/papers/survey5.pdf> +PDF</a>, Slides: <a +href= +http://www.eecis.udel.edu/~mills/database/brief/survey/survey/index.htm> +HTML</a> | <a +href=http://www.eecis.udel.edu/~mills/database/brief/survey/survey.ps> +PostScript</a> | <a +href=http://www.eecis.udel.edu/~mills/database/brief/survey.ppt> +PowerPoint</a> | <a +href=http://www.eecis.udel.edu/~mills/database/brief/survey/survey.pdf> +PDF</a></li> + +<p><li>Mills, D.L. The network computer as precision timekeeper. +<i>Proc. Precision Time and Time Interval (PTTI) Applications and +Planning Meeting</i> (Reston VA, December 1996), 96-108. Paper: <a +href=http://www.eecis.udel.edu/~mills/database/papers/ptti.ps> +PostScript</a> | <a +href=http://www.eecis.udel.edu/~mills/database/papers/ptti.pdf> +PDF</a>, Slides: <a +href= +http://www.eecis.udel.edu/~mills/database/brief/ptti/ptti/index.htm> +HTML</a> | <a +href=http://www.eecis.udel.edu/~mills/database/brief/ptti/ptti.ps> +PostScript</a> | <a +href=http://www.eecis.udel.edu/~mills/database/brief/ptti/ptti.ppt> +PowerPoint</a> | <a +href=http://www.eecis.udel.edu/~mills/database/brief/ptti/ptti.pdf> +PDF</a></li> + +</OL> + +<hr><a href=index.htm><img align=left src=pic/home.gif></a><address><a +href=mailto:mills@udel.edu> David L. Mills <mills@udel.edu></a> +</address></a></body></html> |
