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I've always used ufw by default, even though I also had installed Firestarter

After upgrading from Ubuntu 9.04 to 9.10, by way of Update Manager, I've found ufw disabled (when I look at gufw).

How do I know which firewall is running at any momment?

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2 Answers 2

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Type ufw status into a command prompt. Assesories>Terminal Type "ufw status" without quotes. You may need to type "sudo ufw status". Firestarter is a GUI for the ufw firewall.

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So both GUFW and Firestarter use ufw? –  lamcro Nov 25 '09 at 14:42
    
@lamcro: both ufw and firestarter are using iptables. ;) –  Bobby Nov 25 '09 at 15:08

As far as I know...Ubuntu has no default firewall, because there is nothing to protect (all services listening on a loopback device).

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