The Firewall, VPN Server and Wireless Access Point on a SBC router described in this document is based on publicly available Open Source software. The artist's impression above symbolizes this open approach 
The key features are:
Stateful Firewall - offers highly configurable protection for the internal network.
VPN Server - lets remote users access the resources on the internal network through their local Internet connection (Windows/XP can connect out of the box).
Office Interconnect - combined IPsec VPN server and client allows secure office interconnect.
Versatile Wireless Access Point - 802.11b/g (2.4 GHz) and 802.11a (5 GHz) with antenna diversity for extended range at up to 108 Mbps.
Wireless Security - WEP, WPA or IEEE 802.11i prevents unauthorized access.
Network Address Translation - lets all computers on the internal network share a single Internet connection.
Local Domain server - speeds up DNS lookups and resolves local domains.
Dynamic Host Configuration server - allows computers on the internal network to automatically configure their network interface.
Network Time Protocol server - keeps the clocks of computers on the internal network in sync.
Secure Shell - allows secure remote administration of this router.
Highly configurable - You have the source code; you can make any change you want.
 The HAL for the wireless driver is closed source to meet FCC requirements.