racoon speaks IKE (ISAKMP/Oakley) key management protocol, to
establish security association with other hosts.

This is the IPSec-tools version of racoon.

Enchancements:
- Support of NAT-T.
- Support of IKE fragmentation.
- Support of many authentication algorithms.
- Tons of bugfixes.

Known issues:
- Non-threaded implementation.  Simultaneous key negotiation performance
  should be improved.
- Cannot negotiate keys for per-socket policy.
- Cryptic configuration syntax - blame IPsec specification too...
- Needs more documentation.

Design choice, not a bug:
- racoon negotiate IPsec keys only.  It does not negotiate policy.  Policy must
  be configured into the kernel separately from racoon.  If you want to
  support roaming clients, you may need to have a mechanism to put policy
  for the roaming client after phase 1 finishes.

WWW: http://www.kame.net/ and http://ipsec-tools.sf.net