strongswan-libcharon 5.6.2-1ubuntu2.6 (amd64 binary) in ubuntu bionic

 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)