Vyatta NOS documentation

Learn how to install, configure, and operate Vyatta Network Operating System (Vyatta NOS), which helps to drive our virtual networking and physical platforms portfolio.

Site-to-site configuration

For site-to-site configurations, in addition to configuring the interface as tap device, you must also indicate the subnet mask for the local address that is specified. To configure an OpenVPN site-to-site interface as a tap device, use the configuration shown in the following example.

Configuration options related to tap devices for site-to-site interfaces

interfaces {
    openvpn if_name{
        local-address ipv4 {
            subnet-mask mask
  • device-type tap: This argument tells OpenVPN that the tunnel is to be used as a tap device and operate on Layer 2 traffic. This configuration is required on both ends of the OpenVPN tunnel.
  • local-address: This argument is the IP address at the local end of the OpenVPN tunnel.
  • subnet-mask: This argument is the subnet mask for local-address (for example,