
Understanding IPSec
IP security is a collection of protocols for securing communications at the IP
(Internet Protocol) layer. IPSec was engineered to provide several services: privacy
and confidentiality of data, origin authentication, data integrity, access control, and
protection against replay attacks. IPSec is widely used for VPNs. IPSec consists of
two modes, transport and tunnel. IPSec also consists of two protocols, Encapsulating
Security Payload (ESP) and Authentication Header (AH). IPSec allows for manual or
automatic negotiation of security associations (SAs). All this information makes up
the domain of interpretation, which is used to establish ...