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IPsec

IPsec ( Glossary Link IP Security) is a Glossary Link protocol for securing VPN tunnels.

IPsec is described in RFC 3193: Securing L2TP using IPsec.

IPsec Transport Mode and Tunnel Mode

In Transport Mode, IPsec encrypts the payload of each IP Glossary Link packet, but not the packet headers.

In Tunnel Mode, IPsec encrypts the payload and the headers of each IP packet.

Many networks which are not able to support Tunnel Mode are able to successfully support Transport mode.

IPsec and ISAKMP

IPsec relies on ISAKMP (Internet Security Association and Key Management Protocol) for key exchange.

 

FreeS/WAN IPsec

FreeS/WAN is an implementation of IPsec and Glossary Link IKE for Glossary Link Linux.

The primary objective of the FreeS/WAN project is to help make IPsec widespread by providing Glossary Link source code which is freely available, runs on a range of machines including ubiquitous cheap PCs, and is not subject to US or other nations' export restrictions.

Discuss IPsec in the forums.