Aegis 802.1x is used to connect to an authentication system - extra security for a LAN.
It works with TCP/IP but doesn't run over it. Aegis is it's own protocol, using it's own Port for authentication and what not.
The Properties tab is grayed out because you're not able to configure it. It's a predefined 'standard' that doesn't allow for changes to be made. It's for authentication and has strict settings.