EXPERT RESPONSE
200 machines in a single workgroup? This might be easier to work with if you break it up into smaller domains. You may want to consider breaking these up along organizational lines such as accounting, finance, sales, etc.
Firewalls can be found in hardware and software configuration. Some free versions include IPTables and NetFilter; commercial products include PIX and Checkpoint. So there are really lots of choices. If you go with an open sourced Linux product, keep in mind that you will still have to invest some time to get the firewall configured and tuned.
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