_updown is invoked by pluto when it has brought up a new connection. This script is used to insert the appropriate routing entries for IPsec operation. The interface to the script is documented in the pluto man page.
ipsec(8), ipsec_pluto(8).
Man page written for the Linux FreeS/WAN project <m[blue]https://www.freeswan.org/m[]> by Michael Richardson. Original program written by Henry Spencer.
Paul Wouters