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Although it is possible to adequately configure the firewall through the Mac OS X Sharing System Preference or through third-party applications, sometimes you ll want to get even more granular. For example, you might want to perform a more advanced security lockdown such as denying outgoing traffic for certain ports while continuing to allow incoming traffic on those same ports. Or you might want to disable communications to and from certain IP addresses rather than across the board. These and other specific tasks, such as bandwidth throttling, can be accomplished only by using the command line. They cannot be accomplished with the GUI. Before we delve into the specific commands, we need to discuss some of the ways to get more granular with controlling your firewall and why it is important to maintain this control.
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Getting More Granular Firewall Control
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A network adapter is a physical connection that your computer makes to a network. Network adapters include your Ethernet card (or cards if you have a MacPro), your AirPort interface (whether it is built into your computer or a card that you have added), your FireWire interface, modems, and any other item that allows your computer to access other computers. Because of the nature of complex networking, sometimes you ll want to assign differing rule sets to different interfaces or different IP addresses within different interfaces. For example, you might want to put multiple e-mail domains on separate IP addresses within the same network interface. There are definite benefits to this. The configuration of multiple IP addresses can bring a more fault-tolerant network connection to the server, it can provide other features with the mail server, and it could be used to run various services over the same port on the same system. However, these configurations can be difficult to set up using the graphical tools built into the OS, because each instance of a network interface must be configured separately. By default, all firewall rules created on the Sharing pane are applied to all network interfaces. To make these configuration changes possible, you will need to use the command line to configure the firewall.
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CHAPTER 11: Setting Up the Mac OS X Firewall
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Configuring multiple IP addresses on a Mac is a fairly straightforward process. Each network interface is not limited to using one IP address. Adding an IP address to a network interface is fairly simple. You can do this by opening the Network system preferences pane, clicking the + icon, choosing the appropriate adapter, and clicking the Add button. This creates a second listing for the duplicated network interface and allows you to give it an IP address. If you have multiple IP addresses, you will notice that although network requests can be sent to multiple interfaces on the system, they will always reply from the one that is the primary interface. An example of a system using multiple IP addresses for the same interface, in Figure 11 11, shows that the instance of the AirPort occurs twice: once under the heading of AirPort 3 and once under the heading of AirPort 2.
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Figure 11 11. Adding another IP address
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As mentioned previously, a really important security measure to take with your network is to lock down certain types of outgoing traffic on specific ports. For example, in an educational environment, a system administrator may want to lock down most types of outgoing Internet traffic. Remote control applications, instant messaging applications, and file-sharing peer-to-peer software all tend to be unnecessary on client computers in a classroom environment. Because these programs make requests for outgoing traffic, they will need their ports locked down for them to be properly secured. In the workplace, you might want to block streaming Internet music stations to help conserve precious bandwidth, or you might want to restrict staff from using a file-sharing protocol
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