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OpenVPN Configuration Setup on DD-WRT Router

DNSFlex > VPN Setup  > Router  > OpenVPN Configuration Setup on DD-WRT Router

OpenVPN Configuration Setup on DD-WRT Router

DD-WRT is an open source router software build that can run on a wide range of commercial routers.  It offers OpenVPN, L2TP and PPTP protocol support and can be customised and tuned for ultimate flexibility.   You can check if your router supports DD-WRT firmware here.  Support for DD-WRT installation and how-to guides can be found here



Before you begin


Create a DNSFlex account, then log into the dashboard to manage your SOCKS5/VPN username and password.





  • Once you are logged in, select the “VPN” tab





  • Next, enter your username and password.  This login will be used for VPN, SOCKS5 and SSH server access.





Step 1 – Configure DNS for Route Leak Protection


  • Log into your Router Administrative interface.  Enter the router IP into into your web browser.  This is typically – or


  • In the DD-WRT Administrative interface, navigate to Setup -> Basic Setup




  • Under the Section labelled “DHCP” Enter the DNSFlex DNS Server IP’s in the fields “Static DNS 1” and “Static DNS 2“.  If you need help locating the closest DNS servers in your Region, please refer to the DNS server map here


  • Select the following check boxes – “Use DNSMasq for DHCP” , “Use DNSMasq for DNS” , “DHCP-Authoritative”




  • Click “Save” and “Apply Settings” to save your changes.



Step 2 – Disable IPv6


Dual stack computers tend to prefer IPv6 stack over IPv4, as a result, your internet traffic may leak and divert traffic from the VPN connection.  Disable IPv6 for best practise to ensure all your network traffic is being routed through the VPN connection.


  • Navigate to Setup -> IPv6.  Select IPv6 “Disable“.  Click Save and Apply.





Before you begin – Download DNSFlex OpenVPN Configuration Files


In the next step of this tutorial, you will need to provide authentication and server information found in the DNSFlex .ovpn configuration files.  


  • Start by visiting the DNSFlex VPN locator map here.


  • Select Country


  • Select the VPN configuration file from the drop down menu



  • Save the files in a location for safe keeping



Step 3 – Configure OpenVPN


  • Navigate to Services -> VPN.  Under the OpenVPN Client settings and find “Start OpenVPN Client” and select “Enable




  • Open the .ovpn file you downloaded in the previous step with a text editor of your choice and use these values to fill out the fields.  For illustration purposes, we chose a US VPN Server “”




Server IP/Name =
Port = 1194
Tunnel Device = TUN
Tunnel Protocol = UDP
Encryption Cipher = AES-256-CBC
Hash Algorithm = SHA1
User Pass Authentication = Enable
Username = DNSFlex VPN Username
Password = DNSFlex VPN Password
Advanced Options = Enable (this will enable additional options)
TLS Cipher = None
LZO Compression = Yes
NAT = Enable
Note: If the options are not mentioned in this guide, it is assumed to use the default values provided by DD-WRT.


Note:  If you are running an older version of DD-WRT firmware, the username and password fields may not appear.   Navigate to Administration -> Commands.  Enter this code and replace “Username/Password” with your DNSFlex VPN Username and Password.


echo “USERNAME PASSWORD” > /tmp/openvpncl/user.conf
/usr/bin/killall openvpn
/usr/sbin/openvpn –config /tmp/openvpncl/openvpn.conf –route-up /tmp/openvpncl/ –down-pre /tmp/openvpncl/ –daemon


  • In  the “Additional Config” box, enter the following commands:


remote-cert-tls server
tun-mtu 1500
tun-mtu-extra 32
mssfix 1450
reneg-sec 0
#Delete “#” in the line below if your router does not have credentials fields as such in the previous step:
#auth-user-pass /tmp/openvpncl/user.conf


  • Using your favorite text editor, open the DNSFlex .ovpn configuration file you downloaded prior to Step 3 in this tutorial.   Copy the contents of the CA Certificate and paste it in the box named “Ca Cert“. Ensure all parts are copied including “—–BEGIN CERTIFICATE—– and —–END CERTIFICATE—–”  lines





  • Once more, open the DNSFlex .ovpn configuration file.   Copy the contents of the TLS Key and paste it in the box named “TLS Auth Key“. Ensure all contents of the key are copied including – “—–BEGIN OpenVPN Static key V1—–” and “—–END OpenVPN Static key V1—–” lines.





  • Once all the data is entered, click on “Save” and “Apply“.   Your settings should look like this:




  • To verify your router is connected to the VPN server, navigate to Status -> OpenVPN.  You should see a status message -“CONNECTED SUCCESS”.



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