o Update rc.network to reflect the recent change of default in the

o Update rc.network to reflect the recent change of default in the
  kernel TCP timer code: rather than checking for tcp_keepalive being
  set to "YES", check for "NO" and turn off keepalives if the variable
  is set in that manner.

o Note: eventually, it would make sense to remove this variable from
  rc.conf management, and instead rely on sysctl.conf.  In fact, this
  is probably true of a number of rc.conf variables whose sole aim
  is to drive the setting of sysctls at boot time.