Yet IPSec's operation can be broken down into five main steps: ![]() ![]() IPSec involves many component technologies and encryption methods. IPsec supports network-level peer authentication, data origin authentication, data integrity, data confidentiality (encryption), and replay protection. IPsec uses cryptographic security services to protect communications over Internet Protocol (IP) networks. A secure policy for every peer must be manually maintained. IKE builds on the Oakley protocol and Internet Security Association and Key Management Protocol (ISAKMP), and uses a Diffie-Hellman key exchange to set up a shared session secret, from which cryptographic keys are derived. Internet Key Exchange (IKE) is the protocol used to set up a security association (SA) in the IPsec protocol suite. With this configuration a host in the remote site network of 122.166.12.x and a host in VLAN 1at the main office can communicate with each other securely. The following image shows a sample implementation of a Site-to-Site VPN tunnel using a RV-Series router (Remote Site) and an ASA 5500 (Main Office).
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