[Discover] VidaNix.com " Blog Archive " Como configurar el firewall usando iptables (Ubuntu) - Vida detras de ... http://www.vidanix.com/ws/2007/10/06/como-configurar-el-firewall-usando-iptables/
(iptables linux firewall) 
[Discover] Arno's iptables firewall, configura fácilmente un Firewall basado en iptables " μLibertad http://ulibertad.wordpress.com/2007/08/20/arnos-iptables-firewall-configura-facilmente-un-firewall-b ... (iptables linux firewall)
[Discover] Cortafuegos - Guía Ubuntu http://www.guia-ubuntu.org/index.php?title=Cortafuegos (cortafuegos ufw iptables ubuntu)
[Discover] Shorewall en dos interfaces de red http://www.com-sl.org/staticpages/index.php?page=config-shorewall (nat cortafuegos iptables linux)
[Discover] Arno's iptables firewall, configura fácilmente un Firewall basado en iptables " μLibertad http://ulibertad.wordpress.com/2007/08/20/arnos-iptables-firewall-configura-facilmente-un-firewall-b ... (iptables linux firewall)
[Discover] Cortafuegos - Guía Ubuntu http://www.guia-ubuntu.org/index.php?title=Cortafuegos (cortafuegos ufw iptables ubuntu)
[Discover] Shorewall en dos interfaces de red http://www.com-sl.org/staticpages/index.php?page=config-shorewall (nat cortafuegos iptables linux)