Iptables is used to set up, maintain, and inspect the tables of IP packet filter rules in the Linux kernel. Several different tables may be defined. Several different tables may be defined. Each table contains a number of built-in chains and may also contain user-defined chains.
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This content has been, and is no longer maintained by Indiana University. Information here may no longer be accurate, and links may no longer be available or reliable.Mac OS X includes an easy-to-use thatcan prevent potentially harmful incoming connections from othercomputers. To turn it on or off: Mac OS X 10.6 and later. From the Apple menu, select System Preferences.When the System Preferences window appears, from theView menu, select Security & Privacy (10.7 and later) orSecurity (10.6). Click the Firewall tab. If the orange padlock icon in the lower left side of the window isclosed, click it, and then authenticate with your Mac's administratorusername and password.
This will allow you to make changes. Click Turn On Firewall (10.7 and later) or Start(10.6) to enable the firewall.
Click Turn Off Firewall (10.7and later) or Stop (10.6) to disable the firewall. To configure the firewall, click Firewall Options.(10.7 and later) or Advanced. In the sheetthat appears, choose from the following options:. For the strictest setting, check Block all incomingconnections. Check Automatically allow signed software to receive incomingconnections to allow digitally signed applications access to yournetwork without prompting. Click Enable stealth mode to have your computer ignorepings and similar software that attempts to discover your computer.
Use the plus and minus buttons to add and remove applications fromthe firewall. When added, you can either allow or block traffic tothem.Click OK to save your settings.Mac OS X 10.5.
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From the Apple menu, select System Preferences.When the System Preferences window appears, from theView menu, select Security. Click the Firewall tab. If the orange padlock icon in the lower left side of the window isclosed, click it, and then authenticate with your Mac's administratorusername and password. This will allow you to make changes. To configure the firewall, at the top of the window, click one ofthe radio buttons:. Set access for specific services and applications is thebest choice for most users; it will block most incoming connections,but allow you to make exceptions for trusted services andapplications. Allow only essential services activates the firewall inits strictest mode.
Allow all incoming connections deactivates the firewall.
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