levy

Levy is a helpful perl script that assists with generating basic iptables rulesets quickly and easily. The script is designed to save users time by creating a skeleton ruleset to start with, and can even establish a fully functional firewall with NAT support. Levy has various runtime options, which can be controlled by accessing the full list using levy.pl -h.

To provide some examples, if a user wants to generate a basic firewall that permits incoming traffic to ports 22, 80, and 113 whilst matching their protocols and logs all dropped connections, they can use the command "./levy.pl eth0 22 80 113 -l -r -m -n 192.168.0.0/16 > firewall.rules". Additionally, the user can set reserved addresses aggressively and provide NAT for 192.168.0.0/16.

Assuming the user has tested this ruleset and it seems to be working properly, they can make additional modifications to the firewall configuration. For example, they may choose to open https (443) and create a shell script of the output by running the command "./levy.pl eth0 22 80 113 143 -e -l -r -m -n 192.168.0.0/16 > firewall.rc". This software is a valuable tool, particularly for those who want to provide a basic firewall with minimal effort.