IPsec (Internet Protocol Security) is a collection of protocol extensions for the Internet Protocol (IP). The extensions enable the encryption and information transmitted with IP and ensure secure communication in IP networks such as the Internet.

Mar 13, 2018 · L2TP/IPSec. L2TP (Layer 2 Tunneling Protocol) is a tunneling protocol programmed into most operating systems and VPN-ready devices. On its own, it doesn’t provide any encryption. However, combined with IPSec, it becomes the ideal tool for a VPN. L2TP/IPSec offers high speeds, and extremely high levels of security for data packets. IPSec (Internet Protocol Security) is a protocol or technique provides a security for network layer. IPSec is designed to support secure TCP/IP environment over the Internet considering IPsec is a collection of protocols for securing Internet Protocol (IP) communications by authenticating (and optionally encrypting) each IP packet of a data stream. IPsec also includes protocols for establishing mutual authentication between agents at the beginning of the session and negotiation of cryptographic keys to be used during the session. IPSec is a framework of open standards that provides data confidentiality, data integrity, and data authentication between participating peers at the IP layer. IPSec can be used to protect one or more data flows between IPSec peers.

Nov 13, 2019 · The other IPSec protocol is the Encapsulating Security Payload (ESP) protocol. This protocol provides confidentiality by enabling encryption of the original packet. Additionally, ESP provides data origin authentication, integrity, antireplay service, and some limited traffic flow confidentiality.

IPsec Protocols. AH and/or ESP are the two protocols that we use to actually protect user data. Both of them can be used in transport or tunnel mode, let’s walk through all the possible options. Authentication Header Protocol. AH offers authentication and integrity but it doesn’t offer any encryption.

Mar 02, 2017 · Authentication Header or AH: This protocol provides authentication services to IPSec. The recipient of the message can verify the authenticity of the sender. This protocol also enables verification of the received data, protecting it from the ‘replay attack’ where the sent message is captured by an unauthorized user and re-sent.

May 04, 2020 · 3. L2TP/IPsec VPN Protocol. L2TP, which stands for Layer 2 Tunneling Protocol, is usually combined with IPsec, or Internet Protocol security. Sometimes you’ll only see it written out as L2TP when you’re using your favorite VPN software. L2TP was first proposed as an upgrade to PPTP.