L2TP over IPsec

L2TP, short for Layer Two (2) Tunneling Protocol, is a data link layer (layer 2 of the OSIOpen Source Initiative model) protocol for tunneling network traffic between two peers over an existing network (usually the Internet), better known as VPNVirtual Private Networks. Because of the lack of confidentiality inherent in the L2TP protocol, it is often combined with IPsecInternet Protocol Security, which provides confidentiality, authentication, and integrity. The combination of these two protocols is also known as L2TP over IPsec. L2TP over IPsec allows you, while providing the same functions as PPTP, to give individual hosts access to your network through an encrypted IPsec tunnel.