High Quality Content by WIKIPEDIA articles! Racoon is a tool for handling Internet Key Exchange (IKE) in IPsec for Linux, FreeBSD and NetBSD. It's part of the KAME project, and almost all of the implemented KAME project code has been merged to FreeBSD and NetBSD. IPsec-Tools is a port of the KAME code to Linux. Internet Key Exchange (IKE or IKEv2) is the protocol used to set up a security association (SA) in the IPsec protocol suite. IKE uses a Diffie-Hellman key exchange to set up a shared session secret, from which cryptographic keys are derived. Public key techniques or, alternatively, a pre-shared key, are used to mutually authenticate the communicating parties.