For network security, build a m0n0wall
M0n0wall is an open source firewall and wireless router developed by Manuel Kasper, built on a stripped-down FreeBSD operating system. M0n0wall offers many of the same features found in commercial firewalls products such as Check Point Firewall-1 and Cisco Pix, including stateful packet filtering. With it you can create a secure virtual private network (VPN) between two sites, or you can use m0n0wall as a VPN gateway, so you can access your LAN secure from the Internet. You can use RADIUS for client authentication in order to raise the security even higher.
By Mikael Vingaard at Linux.com
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