OpenVPN DD WRT route tun1 to allow access from other PC's

Question

i do have a little problem.

I set up an OpenVPN connection (client) (which runs using DD WRT on a router) to an OpenVPN server which works great, the thing is i dont know how to route the traffic through the tunnel.

I am able to ping the VPN Server on the router but i cannot access nor ping the vpn server using a pc which is connected to the router.

The OpenVPN client created a tun1 but i do not know how to forward / route everything pointing to 192.168.50.1 through the tunnel on a pc.

Hope someone can help.

Regards

Answer 1

If you're looking to:

• Route traffic behind a router (i.e. remote access), you'll use the route directive in the server config:

  # Linux:
  
    # Pushed Routes #
    #---------------------------------------------------
      push                'route 192.168.1.0 255.255.255.0'
  
      push                'dhcp-option    DNS 192.168.1.1'
      push                'dhcp-option    WINS 192.168.1.1'
  
      client-to-client    '1'
  
  
  # OpenWrt:
  
    # Pushed Routes #
    #---------------------------------------------------
      list    push                'route 192.168.1.0 255.255.255.0'
  
      list    push                'dhcp-option    DNS 192.168.1.1'
      list    push                'dhcp-option    WINS 192.168.1.1'
  
      option  client_to_client    '1'
  

  • Where 192.168.1.0/24 is the subnet behind the VPN you want to access
    
    

• Route all traffic, including web traffic, through the VPN, use the redirect-gateway directive

  • This directive will vary depending on the OS the OpenVPN server is running on:

    push                'redirect-gateway def1'
    

General FYI:

Many simply use the generic configs found online, however, the most benefit and best security comes from tuning the configs.

• I have a tuned server config and client config on my GitHub as an example.
  • tls_auth needs to be updated to tls_crypt in the Server config (see man page below).

I always recommend taking the time to read the OpenVPN HowTo (~15min) & man page (~45min).