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The IPsec standards define two distinct modes of IPsec operation, transport mode and tunnel mode. We will use IPsec to protect the data between IPsec-Gw-1 and IPsec-Gw-2. The following topology shows that Site1 and Site2 exchange data. The difference between ESP and the Authentication Header (AH) protocol is that ESP provides encryption, while both protocols provide authentication, integrity checking, and replay protection.ĪLSO READ: Check open ports in Linux | Test firewall rules

Unlike AH, ESP protocol provides data confidentiality, and also optionally provides data origin authentication, data integrity checking, and replay protection. However, AH does not provide data confidentiality, which means that all of our data is sent in the clear text. AH protocol provides data origin authentication, data integrity, and replay protection. ISAKMP provides a framework for authentication, key management and supports many key exchange protocols like Oakley, Diffie-Hellman, the enhanced Diffie-Hellman and the RSA-based key exchange. Protocols such as Internet Security Association and Key Management Protocol (ISAKMP), Encapsulating Security Payload (ESP) and Authentication Header (AH) are used to protect the data. Internet Protocol Security (IPsec) is a set of protocols that enable us to authenticate and encrypt traffic between two parties.