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26 <p>NTP has been under development for almost 30 years, but the paint ain't dry even now. This release of the NTP Version 4 (NTPv4) distribution for Unix, VMS and Windows incorporates new features and refinements, but retaining backwards compatibility with older versions, including NTPv3 and NTPv2, but not NTPv1. Support for NTPv1 has been discontinued because of certain security vulnerabilities.</p>
29 <li>The behavior of the daemon at startup has been considerably improved. The time to measure the frequency and correct an initial offset error when started for the first time is now no more than ten minutes. Upon restart, it takes no more than five minutes to reduce the initial offset to less than one millisecond without adversely affecting the frequency. This avoids a subsequent frequency correction which could take up to several hours.</li>
38 <li>The OpenSSL cryptographic library has replaced the library formerly available from RSA Laboratories. All cryptographic routines except a version of the MD5 message digest algorithm have been removed from the base distribution. All 128-bit and 160-bit message digests algorithms are now supported for both symmetric key and public key cryptosystems. See the <a href="authentic.html">Authentication Support</a> page for further information and the <a href="authopt.html">Authentication Options</a> page for a list of supported digest algorithms.</li>
40 <li>The NTP descrete event simulator has been substantially upgraded, now including scenarios with multiple servers and time-sensitive scripts. This allows the NTP algorithms to be tested in an embedded environment with systematic and pseudo-random network delay and oscillator wander distributions. This has been used to verify correct operation under conditions of extreme error and misconfiguration. See the <a href="ntpdsim.html"><tt>ntpdsim</tt> - Network Time Protocol (NTP) simulator</a> page. A technical description and performance analysis is given in the white papers at the <a href="http://www.eecis.udel.edu/~mills/ntp.html">NTP Project Page</a>.</li>
42 <li>The status display and event report monitoring functions have been considerably expanded, including new statistics files and event reporting to files and the system log. See the <a href="decode.html">Event Messages and Status Words</a> page for further information.</li>
43 <li>Several new options have been added for the <tt>ntpd</tt> command line. For the inveterate knob twiddlers several of the more important performance variables can be changed to fit actual or perceived special conditions. In particular, the <tt>tinker</tt> and <tt>tos</tt> commands can be used to adjust thresholds, throw switches and change limits.</li>
45 <li>A number of white papers have been added to the library on the NTP Reseatch Project Page, including:</li>
52 <li>Many changes have been made in the NTP algorithms to improve performance and reliability A clock state machine has been incorporated to improve behavior under transient conditions. The clock discipline algorithm has been redesigned to improve accuracy, reduce the impact of network disruptions and allow increased poll intervals to 36 hours with only moderate sacrifice in accuracy. The clock select, cluster and combine algorithms have been overhauled as the result of a thorough statistical analysis.</li>
55 <li>New reference clock drivers have been added for several GPS receivers now on the market for a total of 44 drivers. The reference clock driver interface is smaller, more rational, more flexible and more accurate. Most of the drivers in NTPv3 have been converted to the NTPv4 interface and continue to operate as before. A summary of the supported drivers is on the <a href="refclock.html">Reference Clock Support</a> page. Audio drivers for the Canadian standard time and frequency station CHU, the US standard time and frequency stations WWV/H and for IRIG signals have been updated and capabilities added to allow direct connection of these signals to an audio port. See the <a href="audio.html">Reference Clock Audio Drivers</a> page for further information.</li>
56 <li>Support for pulse-per-second (PPS) signals has been extended to all drivers as an intrinsic function. Further information is on the <a href="pps.html">Pulse-Per-Second (PPS) Signal Interfacing</a> page. Typical performance with the PPS interface and a fast machine are in the low microseconds.</li>
57 <li>Several small changes have been made to make administration and maintenance more convenience. The entire distribution has been converted to gnu <tt>automake</tt>, which greatly ease the task of porting to new and different programming environments, as well as reduce the incidence of bugs due to improper handling of idiosyncratic kernel functions. Version control is provided by Bitkeeper using an online repository at www.ntp.org. Trouble ticket reporting is provided using Bugzilla. If <tt>ntpd</tt>, is configured with NetInfo support, it will attempt to read its configuration from the NetInfo service if the default <tt>ntp.conf</tt> file cannot be read and no file is specified by the <tt>-c</tt> option. When <tt>ntpd</tt> starts it looks at the value of <tt>umask</tt>, and if zero <tt>ntpd</tt> will set the <tt>umask</tt> to <tt>022</tt>.</li>
62 <li>Some configuration commands have been removed, others added and some changed in minor ways. See the Commands and Options collection on the <a href="sitemap.html">Site Map</a> page.</li>
64 <li>There is a minor change to the reference ID field of the NTP packet header when operating with IPv6 associations. In IPv4 associations this field contains the 32-bit IPv4 address of the server, in order to detect and avoid loops. In IPv6 associations this field contains the first 32-bits of a MD5 hash formed from the IPv6 address. All programs in the distribution have been modified to work with both address families.</li>
65 <li>The <tt>tty_clk</tt> and <tt>ppsclock</tt> pulse-per-second (PPS) line discipline/streams modules are no longer supported. The PPS function is now handled by the <a href="drivers/driver22.html">PPS Clock Discipline</a> driver, which uses the new PPSAPI application program interface adopted by the IETF. Note that the <tt>pps</tt> configuration file command has been obsoleted by the driver. See the <a href="pps.html">Pulse-Per-Second (PPS) Signal Interfacing</a> page for further information.</li>
66 <li>Support for the NTPv1 symmetric mode has been discontinued, since it hasn't worked for years. Support continues for the NTPv1 client mode, which is used by some SNTP clients.</li>
67 <li>The <tt>authstuff</tt> directory, intended as a development and testing aid for porting cryptographic routines to exotic architectures, has been removed. Testing and conformance validation tools are available in the OpenSSL software distribution.</li>