Those who have read past the "Malware" warning can be assured there is absolutely no malware in this OS or in the download. This warning comes from the "netcat" binary included in the download as a DOS time client. Unfortunately netcat has code that is flagged as malware.
FREESCO, a NAT/firewall router/server based on Linux and runs on a single 1.44MB floppy. Freesco is very powerful and versatile and can connect multiple home or small office networks to most types of Internet connections...
Slax router is a linux distrubution dedicated as router system. It's include some router/server packages: hostapd, iproute2, bind, dhcpd, openssh, quagga, proftpd, squid, openvpn, webmin and some net tools: nmap, tracroute, arping... etc.
Authdefender is a filtering application that, in combination with iptables, blocks malicious users from accessing any aspect of the server in question. Malicious users are defined by brute force ssh/ftp attempts and blocked regardless of tcp wrappers.