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35   <li>A new feature called  orphan mode provides an automatic, subnet-wide synchronization feature with multiple sources. It provides reliable backup in isolated networks or in pr when  Internet sources have become unavailable. See the <a href="orphan.html">Orphan Mode</a> page for further information.</li>
36   <li>This release includes comprehensive packet rate management tools to help reduce the level of spurious network traffic and protect the busiest servers from overload. There is  support for the optional Kiss-o'-Death (KoD) packet intended to slow down an abusive client. See the <a href="rate.html">Rate Management and the Kiss-o'-Death Packet</a> page for further information.</li>
37   <li>There are two new burst mode features available where special conditions apply. One of these is enabled by the <tt>iburst</tt> keyword in the <tt>server</tt> configuration command. It is intended for cases where it is important to set the clock quickly when an association is first mobilized. The other is enabled by the <tt>burst</tt> keyword in the <tt>server</tt> configuration command. It is intended for cases where the network attachment requires an initial calling or training procedure. See the <a href="assoc.html">Association Management</a> page for further information.</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>
41   <li>NTPv4 includes three new server discovery schemes, which in most applications can avoid per-host configuration altogether. Two of these are based on IP multicast technology, while the remaining one is based on crafted DNS lookups. See the <a href="discover.html">Automatic NTP Configuration Schemes</a> page for further information.</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>
54   <li>Support for the precision time kernel modifications, which are now in stock FreeBSD and optional in Linux kernels, is included. With this support the system clock can be disciplined to the order of one nanosecond. The older microtime kernel modifications in Digital/Compaq/HP Tru64, Digital Ultrix and Sun Microsystems SunOS and Solaris, continue to be supported. In either case the support eliminates sawtooth error, which can be in the hundreds of microseconds. Further information is on the <a href="kern.html">Kernel Model for Precision Timekeeping</a> page.</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>
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>