1.Encapsulating Security Payload (ESP) - It is an IP-based PROTOCOL which USES port 50 for communication between IPsec peers. ESP is used to protect the confidentiality, integrity and authenticity of the data and offers anti-replay PROTECTION.

Drawback - ESP does not PROVIDE protection to the outer IP Header

2.Authentication Header (AH) - It is also an IP-based protocol that uses port 51 for communication between IPsec peers. AH is used to protect the integrity and authenticity of the data and offers anti-replay protection.

Unlike ESP, AH provides protection to the IP header also.

Drawback - AH does not provide confidentiality protection.

1.Encapsulating Security Payload (ESP) - It is an IP-based protocol which uses port 50 for communication between IPsec peers. ESP is used to protect the confidentiality, integrity and authenticity of the data and offers anti-replay protection.

Drawback - ESP does not provide protection to the outer IP Header

2.Authentication Header (AH) - It is also an IP-based protocol that uses port 51 for communication between IPsec peers. AH is used to protect the integrity and authenticity of the data and offers anti-replay protection.

Unlike ESP, AH provides protection to the IP header also.

Drawback - AH does not provide confidentiality protection.