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Using AirVPN with OpenWRT This guide is for users who want to set up a OpenWRT (Chaos Calmer) router and have it already up and running without modification. This guide will work with a router that has more than one network interface and at least 8 MB flash (because of the dependencies). Please backup your router first!!! 1. Set up the wan interface as a dhcp client, that way you can use your router at most of the isp boxes. 2. Set up a wireless network with the name and password of you choise, a dhcp server. (Please note that you should use WPA2-PSK). 3. Connect to your new wireless network. 4. Unbridge the LAN interface(s). Go to "Physical Settings" of the LAN interface(s) and uncheck the "creates a bridge over specified interface(s). Check the interface button of your new wireless network. 5. Connect to your router via SSH. 6. Install dependencies for the openvpn setup. First update the packages, than install openvpn and nanoopkg update opkg install openvpn-openssl opkg install nano 7. Backup the openvpn files mv /etc/config/openvpn /etc/config/openvpn_old 8. Create a new interface called airvpncat >> /etc/config/network << EOFconfig interface 'airvpn' option proto 'none' option ifname 'tun0'EOF 9. Use the "Config Generator" of Airvpn to create the openvpn files. Please select the "Advanced Mode" and check "Separate keys/certs from .ovpn file" and"Resolved hosts in .ovpn file". Save the files on your machine. 10. On the router move into the openvpn folder cd /etc/openvpn 11. Use nano to create all the required files on your router.Copy and paste the following files "AirVPN_**************.ovpn, ta.key, ca.crt, user.crt, user.key".Rename the "AirVPN_**************.ovpn" into airvpn.conf for usability.nano airvpn.conf nano ta.key nano ca.crt nano user.crt nano user.key The air.conf should look like this clientdev tunproto udpremote xxx.XXX.xxx.XXX XXXresolv-retry infinitenobindpersist-keypersist-tunremote-cert-tls servercipher AES-256-CBCcomp-lzo noroute-delay 5verb 3ca ca.crtcert user.crtkey user.keytls-auth ta.key 1 12. Create a firewall zone for the vpn.cat >> /etc/config/firewall << EOFconfig zone option name 'air_firewall' option input 'REJECT' option output 'ACCEPT' option forward 'REJECT' option masq '1' option mtu_fix '1' option network 'airvpn' config forwarding option dest 'air_firewall' option src 'lan' EOF 13. Reboot router 14. Test openvpn configurationopenvpn --cd /etc/openvpn --config /etc/openvpn/airvpn.confAt the end it should show "Initialization Sequence Completed"Stop openvpn with "Ctrl-C". 15. Use the Airvpn DNS (here Port 443 - Protocol UDP) and reboot. Please change if you use different port (https://airvpn.org/specs/)uci add_list dhcp.lan.dhcp_option="6,10.4.0.1"uci commit dhcpreboot 16. Secure against IP Leak, backup old firewall and create new firewall rules mv /etc/config/firewall /etc/config/firewall.backup cat >> /etc/config/firewall << EOF config defaults option syn_flood '1' option input 'ACCEPT' option output 'ACCEPT' option forward 'REJECT' config zone option name 'lan' option network 'lan' option input 'ACCEPT' option output 'ACCEPT' option forward 'REJECT' config zone option name 'wan' option output 'ACCEPT' option forward 'REJECT' option network 'wan' option input 'ACCEPT' config zone option name 'airvpn' option input 'REJECT' option output 'ACCEPT' option forward 'REJECT' option masq '1' option mtu_fix '1' option network 'airvpn' config rule option name 'Allow-DHCP-Renew' option src 'wan' option proto 'udp' option dest_port '68' option target 'ACCEPT' option family 'ipv4' config rule option name 'Allow-Ping' option src 'wan' option proto 'icmp' option icmp_type 'echo-request' option family 'ipv4' option target 'ACCEPT' config rule option name 'Allow-DHCPv6' option src 'wan' option proto 'udp' option src_ip 'fe80::/10' option src_port '547' option dest_ip 'fe80::/10' option dest_port '546' option family 'ipv6' option target 'ACCEPT' config rule option name 'Allow-ICMPv6-Input' option src 'wan' option proto 'icmp' list icmp_type 'echo-request' list icmp_type 'echo-reply' list icmp_type 'destination-unreachable' list icmp_type 'packet-too-big' list icmp_type 'time-exceeded' list icmp_type 'bad-header' list icmp_type 'unknown-header-type' list icmp_type 'router-solicitation' list icmp_type 'neighbour-solicitation' list icmp_type 'router-advertisement' list icmp_type 'neighbour-advertisement' option limit '1000/sec' option family 'ipv6' option target 'ACCEPT' config rule option name 'Allow-ICMPv6-Forward' option src 'wan' option dest '*' option proto 'icmp' list icmp_type 'echo-request' list icmp_type 'echo-reply' list icmp_type 'destination-unreachable' list icmp_type 'packet-too-big' list icmp_type 'time-exceeded' list icmp_type 'bad-header' list icmp_type 'unknown-header-type' option limit '1000/sec' option family 'ipv6' option target 'ACCEPT' config include option path '/etc/firewall.user' config forwarding option dest 'airvpn' option src 'lan' EOF TEST WITH ipleak.net...It worked that way with my router, i would be happy if someone else could verify my setup.

Hi, the port forwarding feature caught my attention but I have some doubts. I think I'm completely lost with this. Let's say I have a server running Linux, basically serving a webpage, I have port forwarding enabled on my router so anyone with my external IP address can connect to it. Okay now let's say I don't want to give out my real IP address, if I understand how the VPN port forwarding feature works, I could use a VPN server to serve that webpage and hide my real IP address (I'd have to deactivate port forwarding on my router and configure it with AirVPN) Is that right? So I connect that Linux server through OpenVPN to an AirVPN's server with port forwarding enabled. For a VPN server, which is a single IP address, there could be maybe 50 persons connected to it, we're sharing the server somehow, but those persons could also enable port forwarding, so, what are the limits/ranges? Two different persons on the same server can't port forward a same port? How does it work? Thanks