Only allow one IP address to FTP?

I’ve got a MBWE (white light) and I’ve got the FTP server working great. I was wondering – is there a way to only allow ONE IP address to FTP? I know I run the risk if I’m trying to access files not from that IP, but I’m getting a fair amount of traffic from random IP addresses.

I don’t think you can do that without going SSL…

How do we go about doing that?