conntrack-tools : Connection tracking userspace tools ( http://conntrack-tools.netfilter.org )
ebtables : Utility that enables basic Ethernet frame filtering on a Linux bridge, MAC NAT and brouting ( http://ebtables.sourceforge.net/ )
iptables : Linux kernel (3.13+) firewall, NAT and packet mangling tools, with nftables compatibility ( http://www.netfilter.org/projects/nftables/ )
iptables-nftables : Linux kernel (2.4+) firewall, NAT and packet mangling tools, with nftables compatibility ( http://www.netfilter.org/projects/iptables/ )
nftables : nftables aims to replace the existing {ip,ip6,arp,eb}tables framework ( http://netfilter.org/projects/nftables/ )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a srcshelton
For Paludis use this rsync : rsync://gentoo.zugaina.org/srcshelton-portage
If you have a problem : ycarus(-at-)zugaina.org