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Internet Protocol Security (IPsec) VPN refers to the process of creating and managing VPN connections or services using an IPsec protocol suite.
It is a secure means of creating VPN that adds IPsec bundled security features to VPN network packets.
IPsec VPN is also known as VPN over IPsec.
IPsec primarily utilizes tunnel mode for creating VPN tunnels. IPsec provides an enhanced level of security on VPN connections by default by providing authentication, encryption and compression services at the network level of VPN. This is achieved through the encapsulated security payload (ESP), authentication header (AH) and IP payload compression (IPComp) protocol. For each outgoing IP packet it is encapsulated and secured using the IPsec packet.