Securing and Optimizing Linux: RedHat Edition -A Hands on Guide
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ftphosts` file

The /etc/ftphosts file is used to define whether users are allowed to log in from certain hosts or whether there are denied access.

Create the ftphosts file, touch /etc/ftphosts and add for example in this file the following lines:
# Example host access file # # Everything after a '#' is treated as comment, # empty lines are ignored allow ftpadmin 208.164.186.1 208.164.186.2 208.164.186.4 deny ftpadmin 208.164.186.5
In the example below, we allow the user ftpadmin to connect via FTP from the explicitly listed addresses 208.164.186.1 208.164.186.2 208.164.186.4, and deny the specified ftpadmin user to connect from the site 208.164.186.5.

Now, change its default permission to be 600:
[root@deep ] /# chmod 600 /etc/ftphosts

32.5.1. Configure the `/etc/ftpusers` file

The /etc/ftpusers/ file specifies those users that are NOT allowed to connect to your FTP server.

Create the ftpusers file, touch /etc/ftpusers and add in this file the following users for security reasons:
root bin daemon adm lp sync shutdown halt mail news uucp operator games nobody

Now, change its default permission to be 600:
[root@deep ] /# chmod 600 /etc/ftpusers

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Configurations	Up	Configure the `/etc/ftpconversions` file

32.5. Configure the /etc/ftphosts file

32.5.1. Configure the /etc/ftpusers file

32.5. Configure the `/etc/ftphosts` file

32.5.1. Configure the `/etc/ftpusers` file