X.509 certificate authentication
In this set of examples, you modify the VPN connection that is configured in the basic set of examples between WEST and EAST (Basic site-to-site connection). The site-to-site connection created in that set of examples used pre-shared keys for authentication. This set of examples modifies the configuration to use X.509 certificates for authentication.
In general, the procedure for obtaining the files required to authenticate using X.509 certificates is as follows: