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Chapter 5

5-2

IP filters

Typical criteria that you define in IP filters are packet source IP addresses,

packet destination IP addresses, and upper-layer protocol of the packet.

However, each protocol has its own specific set of criteria that can be

defined.

For a single filter, you can define multiple criteria in multiple, separate

statements. Each of these statements should reference the same identifying

name or number, to tie the statements to the same filter. You can have as

many criteria statements as you want, limited only by the available memory.

Of course, the more statements you have, the more difficult it is to

understand and maintain your filters.

Configuring IP filters

When you define an IP filter, you can filter traffic in two ways:

• The filter can filter traffic going to a specific destination, coming from a

specific destination, or both.

• The filter can allow network traffic through, or it can reject network

traffic.

To define an IP filter using the Configuration utility

1. In the navigation pane, click Filters.

The IP Filters screen opens.

2. In the IP Filters screen, click the Add button.

The Add IP Filter screen opens.

3. In the Add IP Filter screen, fill in the fields to define the filter. For

additional information about defining an IP filter, click the Help

button.

Note

For information on configuring IP filters from the command line, refer to

the IPFW man page by typing man ipfw at the command prompt. You can

configure more complex filtering by using the IPFW command line interface

than you can from the Configuration utility.

Any ipfw-specific settings will be removed if you subsequently modify the

filter using the Configuration utility.

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