The acrasis.net firewall runs on a Soekris net4801 bought in April 2006. In May I added a card and antenna to turn it into a wireless access point.
The firewall plus access point in normal use. It runs Debian, Shorewall, dhcp3-server, OpenVPN and the hostap driver.
Fitting the antenna, sold as part of a "Soekris kit", proved to be challenging. With a borrowed drill and various other tools, I eventually drilled holes that are not too deranged to make the antenna fit.
The wireless card is an Intersil Prism 802.11b. lspci reports it as a "Network controller: Intersil Corporation Prism 2.5 Wavelan chipset (rev 01)". The card sits in a Mini PCI slot on the Soekris motherboard. The cable from the antenna fits into a socket on the card, with a little curling because it's quite long for the case.
Another view. The computer's "hard disk" is a compact flash card, visible at top right.
After commissioning. The pieces in the foreground from left to right: the antenna, a wooden implement to operate the reset switch, the cables for DMZ, LAN and Internet, the serial cable and power. Wireless clients talk to an OpenVPN server on the Soekris. The vpn's tap0 interface is bridged to eth1, so my wireless laptop is a regular part of the LAN. I made full use of the valuable guidance here to get my configuration working.

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Updated 2008-12-21 15:42 PST