PeerGuardian Linux (pgl) is a privacy oriented firewall application. It blocks connections to and from hosts specified in huge block lists (thousands or millions of IP ranges). pgl is based on the Linux kernel netfilter framework and iptables.
All the configuration files are located in Template:Filename:
- Template:Filename contains a list of URL for retrieving the various block lists,
- Template:Filename, empty by default, overrides the default settings present in Template:Filename,
- Template:Filename lists custom IP ranges that won't be filtered.
The most important aspect that you'll want to change as soon as possible are the preconfigured block lists. The default lists in Template:Filename block many potentially legitimate IP address, so use your best judgment and the information available at I-Blocklist to make your choice.
If you install pgl on a workstation, it is recommended to disable the filtering of HTTP connections. Simply add the following to Template:Filename:
Also, depending on the lists you use, some program might not be able to reach the outside world. For instance, if you use MSN for instant messaging, you'll need to add port 1863 to the white list:
Conversely, you could white list all the ports except the ones used by the program you are trying to restrain. The following example only use the block lists to stop incoming traffic on ports 53 (DNS) and 80 (HTTP):
By default, pgl doesn't block traffic on your local IPv4 addresses. Unfortunately, this behavior relies on a program called ifconfig which is deprecated in Arch Linux. While a new method is being worked on you can use the WHITE_IP_* settings to restore this function, although without the automation.
Let's say that pgl is installed on your workstation (192.168.0.5) and you want to reach some services on another computer (192.168.0.1) on your LAN. Simply add the following to Template:Filename:
If your workstation also hosts services that you would make available to your LAN, add:
For further information, please refer to the # Whitelist IPs # section of Template:Filename.
Once you are comfortable with the configuration of both the daemon and the lists, type in:
To make sure that pgl works as intended, issue this command:
Should you want pgl to run automatically, just add "pgl" to your Template:Filename DAEMONS array.