freeswan 2.04-11.2 (amd64 binary) in ubuntu hoary

IPSEC utilities for FreeSWan
 IPSEC is Internet Protocol SECurity. It uses strong cryptography to provide
 both authentication and encryption services. Authentication ensures that
 packets are from the right sender and have not been altered in transit.
 Encryption prevents unauthorised reading of packet contents.
 .
 These services allow you to build secure tunnels through untrusted networks.
 Everything passing through the untrusted net is encrypted by the IPSEC
 gateway machine and decrypted by the gateway at the other end. The result is
 Virtual Private Network or VPN. This is a network which is effectively
 private even though it includes machines at several different sites connected
 by the insecure Internet.
 .
 Please note that you will need kernel support for using this package. The
 standard Debian kernel already includes support for IPSec. You can build
 alternative kernel IPSec support by installing the kernel-source package and
 kernel-patch-freeswan, which can be automatically applied when using
 make-kpkg, or freeswan-modules-source, which can automatically create a
 modules package with make-kpkg.