On the page https://airvpn.org/topic/9139-prevent-leaks-with-linux-iptables/ there is a guide to setting up rules for iptables to prevent any leaks if the VPN were to disconnect. There are some brief comments accompanying the commands, which is great, but I was wondering if anyone could offer a more in-depth explanation for those of us not familiar with iptables? I've been trying to decode everything through 'man iptables', but it's a little difficult. For example, how do I know that the rules don't open up access to my machine or network through the tunnel? Thanks to anyone who can help!