strongswan-starter - 5.9.8-5+deb12u1 main

The strongSwan VPN suite uses the native IPsec stack in the standard
Linux kernel. It supports both the IKEv1 and IKEv2 protocols.
.
The starter and the associated "ipsec" script control the charon daemon from
the command line. It parses ipsec.conf and loads the configurations to the
daemon.