IP Payload Compression (IPComp) protocol

A protocol in development by the IETF to support secure data exchange. Once completed, IPSec is expected to be widely deployed to implement virtual private networks (VPNs). IPSec supports two encryption modes: Transport and Tunnel. Transport mode encrypts the data portion (payload) of each packet but leaves the header untouched. Tunnel mode is more secure because it encrypts both the header and the payload. On the receiving side, an IPSeccompliant device decrypts each packet.
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A network communications process that protects the contents of protocol packets by encapsulating them in packets of another protocol. Technology enabling one network to send its data via another network’s connections. Tunneling works by encapsulating a network protocol within packets carried by the second network. The use of authentication and encryption to set up virtual private networks (VPNs).
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Internet Protocol SecurityThe security architecture for IP; developed by the IETF to support reliable and secure datagram exchange at the IP layer. The IPSec architecture specifies AH, ESP, Internet Key Exchange (IKE), and Internet Security Association Key Management Protocol (ISAKMP), among other things.
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A mode of IPSec when used in a VPN. In transport mode, the IP packet data is encrypted but the header of the packet is not. An IPSec protocol used with ESP or Alt in which the ESP or Alt header is inserted between the IP header and the upperlayer protocol of an IP packet.
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A mode of IPSec when used in a VPN. In tunnel mode, the entire IP packet is encrypted and a new header is added to the packet to govern transmission through the tunnel. An IPSec protocol used with ESP in which the header and contents of an IP packet are encrypted and encapsulated prior to transmission, and a new IP header is added.
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