IPsec
Internet Protocol security (IPsec) uses cryptographic security services to protect communications over Internet Protocol (IP) networks. IPsec supports network-level peer authentication, data origin authentication, data integrity, data confidentiality (encryption), and replay protection. The Microsoft implementation of IPsec is based on Internet Engineering Task Force (IETF) standards.
In Windows 7, Windows Server 2008 R2, Windows Server 2008, and Windows Vista, you can configure IPsec behavior by using the Windows Firewall with Advanced Security snap-in. In earlier versions of Windows, IPsec was a stand-alone technology separate from Windows Firewall.
