Features of APF-firewall
- The configuration file that is thorough and properly commented
- User id-based outbound network filtering granular inbound and outbound network filtering
- Network filtering based on applications
- Rule files based on trust with an optional enhanced syntax
How To Install apf-firewall on Ubuntu
APF, or Advanced Policy Firewall, is a firewall that is occasionally observed on Liquid Web servers. It is essentially an interface to iptables, which is Linux’s standard interface for controlling network ports. Interacting with iptables may be complicated and error-prone, but APF substantially simplifies it. APF, on the other hand, is still only accessible via ssh. Changes to APF cannot be made using WHM or cPanel. All APF configuration files are stored on your server in the /etc/apf subdirectory. They allow hosts.rules file in this folder contains all of the IP addresses that are whitelisted for the server, while the deny hosts.rules file contains all of the IP addresses that are prohibited by the firewall. Each IP address that is prohibited should contain a justification for the block in the denied hosts.rules file (most of them will be blocked by bfd, which blocks IPs attempting to brute force the server).
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