i think u shuld correct this :
Zitat[admin_valid]
ip = <your-IP>
ip = <your-Port>
to
Zitat[admin_valid]
ip = <your-IP>
port = <your-Port>
example:
[admin_valid]
ip = 192.168.1.10
port = 27017
and there is no benefit ! as far as i know when someone spoofed an admin GUID he has admin right from spoofed guid