How does the “per-user” licensing work on the ASA 5505?
There are two “user” licenses available for the ASA 5505- a 10 user license and a 50 user license or unlimited. For the purposes of these licenses, a “user” is defined as a unique source IP address located on the protected subnet of the firewall. If you have 10 or less computers, the 10 “user” license will work fine. If you have more than 10 computers, or some of those computers have several public IP addresses (such as a webserver hosting multiple IP-based websites), you may require a ASA 5505 with the 50 user license.
