Checking the IPs of your users can greatly increase the security of your ftp server. If someone attempts to connect from an unknown IP address, the ftp server can (if enabled) refuse the connection. RaidenFTPD stores its IP-checking settings in a *.allow file (ex. default.allow). Each line inside this file lists an IP or part of an IP. A user name may be added to the front of an IP (in the form of user@IP) to specify that the IP corresponds to that particular user only. An ! (exclamation point) denies access from that particular IP.
The *.allow file may be edited with a text editor or you may make changes via GUI with the USERS AND GROUPS or IP ACCESS options in the SETUP menu.

Examples

root@90.0.0.1

127.0.0.1

139.175.14.

tommy@!24.181.51.1

!139.141.

tommy@mydomain.com

tommy@*.mydomain.com

note : if you use domain name for IP checking , you must enable dns lookup in server properties editor , and it only works when the IP address can be resolved into a domain name

The first example allows the root user to login from the IP 90.0.0.1. The second example means that anyone is allowed to connect from 127.0.0.1. Similarly, the 3rd line means that everyone is allowed to connect from 139.175.14.* (where * is any value from 0 to 255), and the final two examples show IPs that are banned from the server. The first banned IP blocks tommy from logging in if he is on 24.181.51.1.

If you are running multiple RaidenFTPD configurations, each one may use a different *.allow file, or the same one. It's entirely up to you to decide what you want to do.