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OpenVPN

These instructions were made for routers that have Tomato firmware installed. Tomato version 1.28 was used to prepare this tutorial.

1. On your browser, open router settings page by entering its address in the address bar (the address is 192.168.1.1 by default).

2. On menu located on the left side of the screen click on the VPN Tunneling tab and then click on OpenVPN Client tab.

3. As shown in the screenshot, set the following options:
Start with WAN – Check the box.
Interface Type – TUN.
Protocol – Choose either UDP or TCP and keep it in mind as this will be important later on.

For the first field enter our server hostname you want to connect to. You should connect to a server suggested to you at  https://nordvpn.com/servers/#recommended . You can find the server hostname right under the server title.

For the second field, depending on what protocol you have chosen earlier, input 1194 for UDP or 443 for TCP.
Firewall – Automatic.
Authorization Mode – TLS.
Username/Password Authentication – Checked. Enter your NordVPN credentials in the newly appeared fields.
Username Authen. Only – Unchecked (default).
Extra HMAC authorization (tls-auth) – Choose Outgoing (1) from the drop down list.
Create NAT on tunnel – Checked.

3.1. Some Tomato routers could not have any fields for entering OpenVPN credentials. If this is your case – please go to Administration -> Scripts and enter these lines into the Init field where you should change username and password to your NordVPN credentials:

echo username > /tmp/password.txt
echo password >> /tmp/password.txt
chmod 600 /tmp/password.txt

4. Click on Advanced tab and set the following options, as shown in the screenshot:

Poll Interval: 0
Redirect Internet traffic: Checked
Accept DNS configuration: Strict
Encryption cipher: AES-256-CBC
Compression: Disabled
TLS Renegotiation Time: -1
Connection retry: -1
Verify server certificate: Unchecked
Custom Configuration:

remote-cert-tls server
remote-random
nobind
tun-mtu 1500
tun-mtu-extra 32
mssfix 1450
persist-key
persist-tun
ping-timer-rem
reneg-sec 0
auth sha512

#log /tmp/vpn.log

#Delete `#` in the line below if your router does not have credentials fields:
#auth-user-pass /tmp/password.txt

5. Proceed by clicking on Keys tab. Download OpenVPN configuration pack and extract it. Find a configuration file for the server you were setting up and open it (in this case at1.nordvpn.com.udp1194.ovpn).
Static key – in this field copy and paste text from <tls-auth> to </tls-auth> block.
Certificate Authority – in this field copy and paste text from <ca> to </ca> block.

It should look like this:
Tomato5

6. Confirm and save all changes by clicking on Save button at the bottom of settings page. To establish a connection, click on Start Now button. In order to check if you have connected successfully please visit Status page.

7. You should also configure the router to use NordVPN DNS servers to prevent DNS leaks. Here’s an image on how the setting looks:

Optional Kill Switch set up (for advanced users):

In order to setup a killswitch on Tomato router please do the following:

Navigate to Administration -> Scripts and under Firewall please type in:

WAN_IF=`nvram get wan_iface`
iptables -I FORWARD -i br0 -o $WAN_IF -j REJECT --reject-with icmp-host-prohibited
iptables -I FORWARD -i br0 -p tcp -o $WAN_IF -j REJECT --reject-with tcp-reset
iptables -I FORWARD -i br0 -p udp -o $WAN_IF -j REJECT --reject-with udp-reset

(Every client in LAN will lose internet connection in case of VPN drop.)

WAN_IF=`nvram get wan_iface`
iptables -I FORWARD -i br0 -s `ip address` -o $WAN_IF -j REJECT --reject-with icmp-host-prohibited
iptables -I FORWARD -i br0 -s `ip address` -p tcp -o $WAN_IF -j REJECT --reject-with tcp-reset
iptables -I FORWARD -i br0 -s `ip address` -p udp -o $WAN_IF -j REJECT --reject-with udp-reset

(Only specified IP address will lose internet access in case of VPN drop.)