IPsec
Internet Protocol Security (IPsec) has emerged as the leading suite of protocols governing the use of VPNs. IPSec delivers machine-level authentication and encryption for VPNs based on L2TP (Layer 2 Tunneling Protocol). IPsec provides integrity protection, authentication, and optional privacy and replay protection services. It is an architecture protocol, as well as a related Internet Key Exchange (IKE) protocol, and is defined by IETF RFCs 2401–2409. The IPsec packets comprise the following types:
IP Protocol 50— This is the Encapsulating Security Payload (ESP) format. It defines privacy, authenticity, and integrity.
IP Protocol 51— This is the Authentication Header (AH) format. It defines authenticity and integrity, but not privacy. ...
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