I'd recommend that you obtain specialized devices to fill each role on your network. It's a best practice to have a dedicated router filing the router role, and it'll be better yet if you can purchase a hardware router, rather than building one on a FreeBSD server. Similarly, you should have a separate device acting as your IDS sensor.
The reason for all of this? Minimizing complexity. A more complex networking environment increases the chances of something going wrong and makes it more difficult to troubleshoot network problems.
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