Bane wrote:For power, simplicity, and price I suggest Monowall or PFSense.
Seconded, the m0n0wall and PFsense family usually provided everything you need. Just be wary if you're running this in a heavy usage environment as it's performance can start to suffer at 20Mb+ depending on ruleset optimisation and utilised features.
Can't think of anything better for small environments though.
Agree. Smaller netscreens and pix's are also good options. Provided you can find them for a good price. Also be aware, you may or may not be able to get software updates for a second hand device, vendor policies differ.
I have been using IPCop for a while now. (www.ipcop.org). It works pretty well, although development is a bit slow. Mine runs on a small-factor compaq box which I bought on ebay for $30. One nice feature is integrated Snort.
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