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.
A more native, efficient solution to achieve the same end is to use the ipset kernel module in conjunction with the pg2ipset tool and the ipset-update script.
There are two AUR packages to choose from: AUR includes only the daemon and CLI tools, while AUR comes complete with a GUI (written using Qt).
/etc/pgl/blocklists.listcontains a list of URL for retrieving the various block lists.
/etc/pgl/pglcmd.conf, empty by default, overrides the default settings present in
/etc/pgl/allow.p2plists custom IP ranges that will not be filtered.
The default lists in
/etc/pgl/blocklists.list block many potentially legitimate IP address. Users are encouraged to exercise best judgment and the information available at I-Blocklist.
It is recommended to disable the filtering of HTTP connections by adding the following to
Conversely, one could white list all the ports except the ones used by the program to be blocked. The following example only use the block lists to stop incoming traffic on ports 53 (DNS) and 80 (HTTP):
WHITE_TCP_IN="0:79 81:65535" WHITE_UDP_IN="0:52 54:65535"
systemd initialization of the system means that it is quite possible for a server to be briefly unprotected, prior to pgl launch. To ensure adequate protection, extend the unit
httpd.service with the following:
[Unit] Wants=pgl.service After=pgl.service
By default, pgl blocks traffic on the local IPv4 addresses. To disable this behavior, edit
/etc/pgl/pglcmd.conf to add an exception using the WHITE_IP_* setting:
For further information, please refer to the
# Whitelist IPs # section of
Once comfortable with the configuration of both the daemon and lists, start the
pgl service. To make sure that pgl works as intended, issue this command:
# pglcmd test
To start pgl automatically at boot, enable the
Running pgl from within a container
[Unit] Description=%i LXC After=network.target [Service] Type=forking ExecStartPre=/usr/bin/modprobe -a xt_NFQUEUE xt_mark xt_iprange ExecStart=/usr/bin/lxc-start -d -n %i ExecStop=/usr/bin/lxc-stop -n %i Delegate=true [Install] WantedBy=multi-user.target