Second command: Allow traffic from my_lan_interface to my_modem_interface.Here we prefer to restrict inbound traffic from the internet and allow all outgoing: iptables, by default, will unconditionally forward all traffic. Now we are going to configure forwarding rules. The -random flag is to have symmetric NAT. First command: enable masquerading on my_modem_interface so the source address is rewritten on outgoing packets.Here's an explanation for the commands just above (the 'more robust' example), in the same order: Sudo iptables -A FORWARD -i my_modem_interface -o my_lan_interface -m conntrack -ctstate RELATED,ESTABLISHED -j ACCEPT Sudo iptables -A FORWARD -i my_lan_interface -o my_modem_interface -j ACCEPT Sudo iptables -t nat -A POSTROUTING -o my_modem_interface -j MASQUERADE -random Sudo iptables -t nat -I POSTROUTING -o my_modem_interface -j MASQUERADEīut there is a more robust way, that I found on the net: Sudo iptables -I FORWARD -i my_modem_interface -o my_lan_interface -j ACCEPT Sudo iptables -I FORWARD -i my_lan_interface -o my_modem_interface -j ACCEPT Next, you can run these commands, as that guide says (but wait, and read on): Now you set up packed forwarding:įirst you need to enable packet forwarding on your Linux PC (see that guide I linked from ). The interface names, on Linux, are at the leftmost side, like: enp2s0, enp3s0, enp0s18f2u6, lo. You will need to find out your network interfaces names by running the command 'ifconfig' on Linux (in the terminal), and 'ipconfig' on Windows (in the command prompt). It's called (kernel) packet forwarding, and it's quite simple and quick to do - when you understand it finally. I have a 3G USB modem connected to my Linux PC, and from that I have two Windows PC's that get internet. But I found out, that in Windows, the DNS address that the Linux PC is using, must also be given in Windows.

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