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  1. Hi everyone, I had some difficulty setting up port forwarding with the Merlin WRT firmware on my ASUS routers and did not find a great guide online so figured I would write one up to hopefully help save someone a few hours of pain. 1. Download the Merlin WRT firmware from the website and just upload is as a regular file through the Administration -> Firmware Upgrade page. 2. Once done go to Administration -> System -> Persistent JFFS partition and make sure enable both options and restart. This is where the script will go. Restart the router. 3. Download Win-SCP to help you upload and edit files on the router. I found this to be the easiest way. 4. Log in to your router with WinSCP: - File protocol: SCP - Host name: Router IP (eg. - User name/Password of your router – Login 5. Use the “..” folder all the way on the top to go all the way back where you will see “jffs” partition. Go to jffs -> scripts and then right click and create new file named “nat-start” without quotations. So /jffs/scripts/nat-start For whatever reason the first time I activated JFFS partition it was read only and did not allow me to create any new files so I followed the instructions here and used the commands through telnet to mount the partition and then restarted the router 6. Once the file is created, right click and goto properties and make sure Owner permission has check next to “X” making it executable. You can do this through telnet also using chmod command. 7. Use the following script below to setup port forwarding: #!/bin/sh iptables -I FORWARD -i br0 -o tun11 -j ACCEPT iptables -I FORWARD -i tun11 -o br0 -j ACCEPT iptables -I FORWARD -i br0 -o vlan1 -j DROP iptables -I INPUT -i tun11 -j REJECT iptables -t nat -A POSTROUTING -o tun11 -j MASQUERADE iptables -I FORWARD -i tun11 -p udp -d *IP of device requiring open port* --dport *Port* -j ACCEPT iptables -I FORWARD -i tun11 -p tcp -d *IP of device requiring open port* --dport *Port* -j ACCEPT iptables -t nat -I PREROUTING -i tun11 -p tcp --dport *Port* -j DNAT --to-destination *IP of device requiring open port* iptables -t nat -I PREROUTING -i tun11 -p udp --dport *Port* -j DNAT --to-destination *IP of device requiring open port* ~Obviously replace the stuff between * * with the right numbers and remove the *. 8. To check which tun and vlan you have telnet to your router and type in “ifconfig” and use this information to determine this. The 2nd paragraph can be copied for multiple ports. I have OSX so I used "Terminal.app" and typed "telnet" and then type in your admin/pass, then "ifconfig". 9. That’s it. Save it and restart your router. Make sure you obviously setup the correct ports on the AirVPN website. 10. You can check under your router page: System Log -> Port Forwarding to see the appropriate ports being forwarded. Also can check through the AirVPN website. Hope that helps. Let me know if something is unclear and I will modify it. Thanks and enjoy.
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