Install shorewall6 by entering the following commands in the terminal:
sudo apt update sudo apt install shorewall6
Description:
Shoreline Firewall (IPv6 version), netfilter configurator
Shorewall6 allows firewall/gateway requirements to be described using entries in a set of configuration files. It reads those configuration files and, with the help of the iptables utility, configures netfilter to match these requirements. . Shorewall6 supports a wide range of router/firewall/gateway applications, traffic shaping and almost every type of VPN. . This package contains IPv6 support.
Homepage: http://www.shorewall.net
Version: 5.1.12.2-1
Section: universe/net