4.x:
  Balance release branch 4 has been forked based on Balance 3.34

3.57: 
  MAXGROUPS has been increased to 32

3.56: 
  Out-of-band data handling has been added.

3.54: 
  A bug with hash_fold() regarding incoming IPv4 and IPv6 source addresses has been fixed. The “hash” group mechanism is now working as expected.

3.52: 
  Buffering has been disabled for interactive shell IO. A new “assign” command has been added to allow changing of the host:port assignment of a channel (only if disabled). A locking bug has been fixed.

3.50:
   A new option -6 has been added to force IPv6 bind.

3.49:
  A patch has been applied due to a problem with ftok() on Solaris.

3.48: 
  Problems with setting IPV6_V6ONLY socket option are now handled more nicely with a syslog warning message.

3.42:
  Balance now compiles also on systems where IPV6_V6ONLY is undefined (like some Solaris systems).

3.40:
  IPv6 support on the listening side has been added. MAXCHANNELS in balance.h has been increased to 64.

3.35:
  A bug in the autodisable functionality has been fixed.

3.34:
  -a option added (enables “autodisable” option: A channel needs to be manually re-enabled after a failure). Syslog logging added for reporting this event.

3.33: 
  -M option added (use MMAP instead of SHM for IPC)

3.32:
  Bugfix: /var/run/balance may now already exist.

3.31:
  Bugfix: TCP_NODELAY properly set.

3.30:
  Code cleanups and fixes.