IPsec (Internet Protocol Security) is a framework that helps us to protect IP traffic on the network layer. Why? because the IP protocol itself doesn’t have any security features at all. IPsec can protect our traffic with the Confidentiality, Integrity, Authentication and Anti-replay.
A site-to-site VPN connection lets branch offices use the Internet to access the main office's intranet. A site-to-site VPN allows offices in multiple, fixed locations to establish secure connections with each other over a public network such as the Internet.
IPsec is pretty complex and there are a lot of different ways to implement it.The following video provide instructions for configuring site-to-site IPSEC VPN on FortiGate-to-FortiGate firewall.
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