In this blog post we are going to review and compare the ways in which IOS and ASA Easy VPN servers perform ezVPN attribute authorization via RADIUS. The information on these procedure is scattered among the documentation and technology examples, so I thought it would be helpful to put the things together.
To begin with, let’s establish some sort of equivalence between the IOS and ASA terminology. Even though ASA inherited most of it’s VPN configuration concepts from the VPN3000 platform it is still possible to find similarities between the IOS and the ASA configurations. Recall that IOS ezVPN configuration defines local ezVPN group policy by means of the crypto isakmp client configuration group command. This could be viewed as a rough equivalent to the ASA’s group-policy type internal command, though the ASA’s command scope is much broader. IOS ISAKMP profiles could be viewed as an equivalent to the ASA’s tunnel-group command defining a connection profile.