_realsetup is called by the system init scripts to start the Openswan system. It starts the appropriate kernel stack, such as KLIPS or NETKEY and pluto (the userspace keying component).
ipsec(8), ipsec__klipsstart(8), ipsec__plutorun(8).
Man page written for the Linux FreeS/WAN project <http://www.freeswan.org/> by Michael Richardson. Original program by Henry Spencer.