2ping 2.0 (2012-04-22)
  * Updated to support 2ping protocol 2.0
    * Protocol 1.0 and 2.0 are backwards and forwards compatible with 
      each other
    * Added support for extended segments
    * Added extended segment support for program version and notice 
      text
    * Changed default minimum packet size from 64 to 128 bytes
  * Added peer reply packet size matching support, turned on by default
  * Added extra error output for socket errors (such as hostname not 
    found)
  * Added extra version support for downstream distributions
  * Removed generation of 2ping6 symlinks at "make all" time (symlinks 
    are still generated during "make install" in the destination tree

2ping 1.2.3 (2012-01-01)
  * Fixed ewma report (was always showing the last rtt)
  * Fixed the various brown paper bag stuff I did in 1.2.1 and 1.2.2 
    while I rediscovered the magical journey that is git

2ping 1.2 (2011-12-24)
  * Added exponentially-weighted moving average (ewma) and moving 
    standard drviation (mdev) statistics to the summary display

2ping 1.1 (2011-04-05)
  * Host processing delays sent by the peer are no longer considered
    when calculating RTT
  * Changed ID expiration (for which no courtesty was received) time
    from 10 minutes to 2 minutes
  * Manpage fix: correct UDP port number listed
  * Added an RPM spec file

2ping 1.0 (2010-10-20)
  * Protocol now "finished", 2ping is now "stable"!
  * Removed the sample initscript
  * Small Makefile and documentation changes

2ping 0.9.1 (2010-10-09)
  * Version bumped to 0.9.1 to signify a stable standardization is close
  * Changed the default UDP port from 58277 to 15998 (IANA-registered 
    port)
  * Host processing latency is now subtracted where possible (protocol 
    extension, backwards compatible)
  * Minor code cleanup
  * 0.9.0 (unreleased) was a Brown Paper Bag commit; typo in ChangeLog 
    fixed

2ping 0.0.3 (2010-10-03)

  * Large cleanup and documentation push -- code is now "acceptable"
  * Fixed calculation of opcode data area lengths on some opcodes; 
    implementation now incompatible with 0.0.2
  * Added more checks against malformed packets; 2ping no longer produces
    produces Perl warnings when fuzzing
  * Added a preload (-l) option, mimicking ping's -l functionality
  * Added a 2ping6 symlink; 2ping will now assume -6 if called as 
    2ping6
  * Added a message authentication code (MAC) option with a pre-shared 
    key (--auth=key), allowing for message authentication and 
    verification while in transit
  * Added a timed interval of brief statistics output (--stats=int)
  * STDOUT buffering is disabled in all modes now
  * Added compatibility down to Perl 5.6.0
  * Cleaned up distribution tarball, added a Makefile
  * Changed man section from 1 to 8

2ping 0.0.2 (2010-09-07)

  * Fixed potential endianness issues
  * Added packet checksum field, in a fixed position near the
    beginning of the packet (PROTOCOL NOW INCOMPATIBLE WITH 0.0.1
    RELEASE)
  * Added state table cleanup notification between peers, which will
    keep memory usage down in longer flood ping situations (protocol
    opcode added)
  * Added support for multiple binds in listen mode (specify -I IP
    multiple times)
  * Added support for multiple peers in client mode (specify multiple IP 
    arguments)
  * Added additional packet error checks
  * Misc code cleanup and documentation (not yet to my satisfaction, but 
    it's a start)

2ping 0.0.1 (2010-08-29)

  * Initial release