I am using an 1801 for test purposes. The router is setup to nat a 192.168.x.y/24 network. Connectivity/browsing/NAT/VPN/Portforwarding all work fine. The router has a single static IP.
I have opened open port 21 to forward to forward to my 192.168.x.y host on the my PC behind the router and all that works fine. I can connect to the FTP server.
What I would like to do is only allow a single host to connect to the FTP port. I have tried doing this with access lists and have tried to set this up using the web configuration tool but it does not work.
Can anyone help me out with a sample config as to how I can achieve this (without buying an ASA )