ConfigServer Security & Firewall
From Webmin Documentation
ConfigServer Security & Firewall is powerful set of Unix scripts which help properly configure iptables firewall as well as provide daemon checking for login authentication failures. Each option is extensively described and even default installation checking your current configuration and then gives you hints for improving security of your server.
Csf provides module for Webmin included in its own installation package. After standard installing of csf+lfd on your server, you can choose:
Webmin > Webmin Configuration > Webmin Modules >From local file > /usr/local/csf/csfwebmin.tgz > Install Module
After successful installation, you will see following screen:
The last step is updating of symlink in webmin module.