Dynamic IP's

[cubber]

I am using minilogin and am wondering how to set it up so that I can let people who have dynamic IP addresses on my lan to log into my server. I am having people login to my network via an OpenVPN server that is part of my Endian Firewall. One drawback of this is that I have not found a way to assign static IP's to users that connect to the OpenVPN server. Is it possible to use wildcards for the IP address when setting up an account in the mysql database (for example: *.*.*.*) ? Or do I manually have to change the IP addresses everytime someone wishes to connect to the server?