Binary package “strongswan-ike” in ubuntu trusty

strongSwan Internet Key Exchange (v2) daemon

 The strongSwan VPN suite uses the native IPsec stack in the standard
 Linux kernel. It supports both the IKEv1 and IKEv2 protocols.
 .
 Charon is an IPsec IKEv2 daemon. It is
 written from scratch using a fully multi-threaded design and a modular
 architecture. Various plugins provide additional functionality.