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WARNING: this guide assumes that you have no IPv6 connectivity. If you have, you should block outgoing IPv6 packets while connected to the VPN with "ip6tables". Please see https://airvpn.org/faq/software_lock Here is a guide to prevent leaks and completely stop traffic when the VPN drops in Linux. If the openvpn connection drops you will not be able to access the internet while the firewall is activated. Just click the "stop firewall" button and reconnect with Openvpn, then re-enable to firewall. If you wish to connect to the internet without openvpn just press the "stop firewall" button within firestarter. This way you are protected in the VPN drops. Tested on Debian, Ubuntu, Mint, and OpenSUSE. This is assuming you have already setup OpenVPN on Linux after following the guide here-----> https://airvpn.org/linux/ 1). Install Firestarter firewall for Linux by opening the terminal and typiing ----> sudo apt-get install firestarter 2). Allow traffic on the OpenVPN interface by updating /etc/firestarter/user-pre. There are multiple ways to do this depending on your Linux Distro. Here are 2 examples. A). Open the terminal with root privileges and type-----> gksu gedit /etc/firestarter/user-pre Add the following text to /etc/firestarter/user-pre and save----------> $IPT -A INPUT -i tun+ -j ACCEPT $IPT -A OUTPUT -o tun+ -j ACCEPT . The second way is simply to go to the folder /etc/firestarter/ and click on the file USER-PRE and open in terminal with root privileges. Then add the code and save-----> $IPT -A INPUT -i tun+ -j ACCEPT $IPT -A OUTPUT -o tun+ -j ACCEPT 3). Restart Firestarter by opening the terminal and typing ------------> sudo /etc/init.d/firestarter restart 4). Follow the images below to finish. You may have to restart the machine afterwards. <a href="/external_link/?url=http%3A%2F%2Fbeta.photobucket.com%2F" target="_blank"><img src="/external_image/?url=http%3A%2F%2Fi1285.photobucket.com%2Falbums%2Fa582%2Fcorsair28%2F01firewallwizard.png" border="0" alt="Photobucket"/></a> <a href="/external_link/?url=http%3A%2F%2Fbeta.photobucket.com%2F" target="_blank"><img src="/external_image/?url=http%3A%2F%2Fi1285.photobucket.com%2Falbums%2Fa582%2Fcorsair28%2F02firewallwizard.png" border="0" alt="Photobucket"/></a> <a href="/external_link/?url=http%3A%2F%2Fbeta.photobucket.com%2F" target="_blank"><img src="/external_image/?url=http%3A%2F%2Fi1285.photobucket.com%2Falbums%2Fa582%2Fcorsair28%2F03wizard.png" border="0" alt="Photobucket"/></a> <a href="/external_link/?url=http%3A%2F%2Fbeta.photobucket.com%2F" target="_blank"><img src="/external_image/?url=http%3A%2F%2Fi1285.photobucket.com%2Falbums%2Fa582%2Fcorsair28%2F04selectthepolicytab.png" border="0" alt="Photobucket"/></a> <a href="/external_link/?url=http%3A%2F%2Fbeta.photobucket.com%2F" target="_blank"><img src="/external_image/?url=http%3A%2F%2Fi1285.photobucket.com%2Falbums%2Fa582%2Fcorsair28%2F05nothingdotooninboundp.png" border="0" alt="Photobucket"/></a> <a href="/external_link/?url=http%3A%2F%2Fbeta.photobucket.com%2F" target="_blank"><img src="/external_image/?url=http%3A%2F%2Fi1285.photobucket.com%2Falbums%2Fa582%2Fcorsair28%2F06selectoutboundtraffic.png" border="0" alt="Photobucket"/></a> <a href="/external_link/?url=http%3A%2F%2Fbeta.photobucket.com%2F" target="_blank"><img src="/external_image/?url=http%3A%2F%2Fi1285.photobucket.com%2Falbums%2Fa582%2Fcorsair28%2F07policyoutboundsetrest.png" border="0" alt="Photobucket"/></a>