strongswan-libcharon - 5.9.1-1+deb11u4 main

The strongSwan VPN suite uses the native IPsec stack in the standard
Linux kernel. It supports both the IKEv1 and IKEv2 protocols.
.
This package contains the charon library, used by IKE client like
strongswan-charon, strongswan-charon-cmd or strongswan-nm as well as standard
plugins:
- socket-default
- counters
- bypass-lan (disabled by default)
.
On Linux, it also contains the xfrmi binary which can be used on Linux 4.19+
to create XFRM interfaces (for more information, see
https://wiki.strongswan.org/projects/strongswan/wiki/RouteBasedVPN)