Packages with the iptables use flag

net-firewall / firewalld : A firewall daemon with D-Bus interface providing a dynamic firewall

  • Add support for net-firewall/iptables as firewall backend

net-firewall / fwknop : Single Packet Authorization and Port Knocking application

  • Use net-firewall/iptables as the default server backend

net-misc / connman : Provides a daemon for managing internet connections

  • Use net-firewall/iptables as firewall.

net-misc / networkmanager : A set of co-operative tools that make networking simple and straightforward

  • Use net-firewall/iptables for connection sharing

sys-apps / iproute2 : kernel routing and traffic control utilities

  • include support for iptables filtering

sys-apps / systemd : System and service manager for Linux

  • Use libiptc from net-firewall/iptables for NAT support in systemd-networkd; this is used only if the running kernel does not support nftables