L2TP/IPsec is a standard combination of Layer 2 Tunneling Protocol (L2TP) and Internet Protocol Security (IPsec). IPsec provides two functions: First, IPsec encrypts the L2TP packets to keep the data private. Secondly, IPsec can be used to provide integrity protection for the L2TP control message traffic. The L2TP/IPsec protocol, defined in RFC 3193, is used to build VPNs. An L2TP/IPsec client (a VPN client using the L2TP protocol and IPsec) creates an IPsec tunnel; an L2TP/IPsec server (a VPN server using the L2TP protocol and IPsec) accepts incoming IPsec tunnel connections. The combination of these two components specifies an L2TP/IPsec VPN. A potential point of confusion in L2TP/IPsec is the use of the terms tunnel and secure channel. A tunnel is an Internet Protocol (IP) packet sent across an IP network that wraps up and carries another IP packet inside it. The protocol used for creating such tunnels is the Layer 2 Tunneling Protocol (L2TP). L2TP is not a VPN, but it can be used together with other protocols to create a VPN.
Lots of people get confused by this as they are both VPN protocols that use IPSec as a critical feature. So what is the difference between IPsec and L2TP? First, let’s start with a quick primer on IPSec. The main difference between IPsec and l2tp is their scopes. IPsec is a standard for security services at the network layer. It requires kernel modifications, while l2tp is a standard for tunnelling the layer two protocol over another layer 3 protocols such as IP, with no kernel modifications required. IPsec is a protocol that is included in Apple`s built-in VPN capabilities. Using IPsec and the right connections, it can secure communications at greater distances than other VPN protocols and still ensure security. L2TP is a standard VPN protocol that uses two other protocols — PPTP and MS-CHAP v2 — to create a secure connection. L2TP makes use of an IPSec channel to complete its secure handshake functions, which makes it one of the most widely supported VPN protocols out there.
l2tp is a protocol that uses both TCP(L2TP control protocol) and UDP(l2tp data protocol) Any VPN (Acronym for Virtual Private Network) is a network that extends across a public telecommunication infrastructure like the Internet. It enables users to send and receive data across shared or dedicated links as if they were directly connected to the private link. With a virtual network, you can access resources shared within the network as if you are physically connected.
The l2tp and IKEv2 IPsec connections are inherently more secure than PPTP and SSTP. IPsec is more secure than PPTP because it uses Encapsulating Security Payload (ESP) instead of the outdated Point-to-Point Protocol (PPP), which is vulnerable to hackers. IKEv2 IPsec provides higher encryption, integrity check, data authentication, replay security, firewall traversal, and at least 128-bit strength for encryption.