Configuring a global MAC authentication password
MAC authentication requires that only a single entry containing the user name and password is placed in the user database with the device's MAC address. This creates an opportunity for malicious device spoofing. The global password option configures a common MAC authentication password to use for all MAC authentications sent to the RADIUS server. This makes spoofing more difficult.
It is important that when implementing the global MAC authentication password option, that the user database on the RADIUS server has this password as the password for each device performing MAC authentication.