strongswan-plugin-duplicheck 5.3.5-1ubuntu3 (arm64 binary) in ubuntu xenial

 The strongSwan VPN suite uses the native IPsec stack in the standard
 Linux kernel. It supports both the IKEv1 and IKEv2 protocols.
 .
 This package provides the strongSwan plugin for the duplicheck functionality.
 .
 The duplicheck plugin provides an advanced but very specialized peer identity
 duplicate checking. It works independent from the ipsec.conf uniqueids feature.
 .
 More information may be found at:
 http://wiki.strongswan.org/projects/strongswan/wiki/Duplicheck
 .
 This plugin is now disabled. This package can be safely removed once it's
 installed.