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I'm very new to this new environment (coming from Windows) and I need some help setting up a hardware firewall and web server combo. I already have my website set up and I would like some guidance on what I should do next for the firewall portion. Is there something I could use that I would not need to rebuild a machine to put on, such as Astaro? Ideally something I can apt-get.

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The Ubuntu server guide has quite a good walkthrough of setting up a firewall:

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