Cyclades User's Guide manual IPsec, Kerberos

IPsec	Short for IP Security Protocol, IPsec is an extended IP protocol
	that provides encrypted security services. These services enable
	authentication, as well as access and trustworthiness control.
	IPsec provides similar services as SSL, but it works on a network
	layer. Through IPsec you can create encrypted tunnels (VPN) or
	encrypt traffic between two hosts.
Kerberos	Kerberos was created by MIT as a solution to network security
	problems. The Kerberos protocol uses strong cryptography so
	that a client can prove its identity to a server (and vice versa)
	across an insecure network connection. After a client and server
	has used Kerberos to prove their identity, they can also encrypt all
	of their communications to assure privacy and data integrity as
	they go about their business.
KVM	Keyboard, video and mouse interface to a server.
LDAP	Lightweight Directory Access Protocol. A software protocol for
	enabling anyone to locate organizations, individuals, and other
	resources such as files and devices in a network, whether on the
	Internet or on a corporate intranet. LDAP is a "light weight"
	(smaller amount of code) version of DAP (Directory Access
	Protocol), which is part of X.500, a standard for directory
	services in a network.
MAC	Medium Access Control. Internationally unique hardware
	identification address that is assigned to the NIC (Network
	Interface Card) which interfaces the node to the LAN.
MD5	MD5 (Message-Digest algorithm 5) is a cryptographic hash
	function with a 128-bit hash value. MD5 has been employed in a
	wide variety of security applications and is commonly used to
	check the integrity of files.
MTU	Short for Maximum Transmission Unit, the largest physical
	packet size, measured in bytes, that a network can transmit. Any
	messages larger than the MTU are divided into smaller packets
	before being sent.

462 AlterPath KVM/net Installation, Administration, and User’s Guide