Exploring IPsec in SD-WAN

This chapter examines the essential role of IPsec in software-defined wide area networks (SD-WAN), emphasizing its common use cases and modes, particularly tunnel mode. The discussion covers the intricacies of IPsec protocols, especially the Internet Key Exchange (IKE), while also addressing troubleshooting scenarios and alternative VPN protocols. Furthermore, it contrasts the functionalities of Authentication Header (AH) and Encapsulating Security Payload (ESP), highlighting their significance in network security and traffic management.