![]() Now set up the Linux firewall to permit packets to flow freely over the newly created tap0 and br0interfaces: iptables -A INPUT -i tap0 -j ACCEPT Next, we will edit the OpenVPN server configuration file to enable a bridging configuration.Ĭomment out the line which says dev tun and replace it instead with: dev tap0Ĭomment out the line that begins with server and replace it with: server-bridge 192.168.8.4 255.255.255.0 192.168.8.128 192.168.8.254 It will create a persistent tap0 interface and bridge it with the active ethernet interface. ![]() You can use the Linux ifconfig command to get the necessary information about your network interfaces to fill in the bridge-start parameters. Make sure to use an interface which is private and which is connected to a LAN which is protected from the internet by a firewall. Set the br, tap, eth, eth_ip, eth_netmask, and eth_broadcast parameters according to the physical ethernet interface you would like to bridge. Bridge Server on Linuxįirst, make sure you have the bridge-utils package installed.Įdit the bridge-start script below. Next, proceed below according to whether you are setting up the bridge on Linux or Windows. The first step is to follow the HOWTO up to the "Starting up the VPN and testing for initial connectivity" section. Both methods are described more fully in this FAQ item.įor our example, we will use these bridge settings: Setting In this example, we will use the first method where the OpenVPN server manages its own IP address pool on the LAN subnet, separate from the pool used by the DHCP server (if one exists). configure the DHCP server on the LAN to also grant IP address leases to VPN clients.Let OpenVPN manage its own client IP address pool using the server-bridge directive, or.There are two methods for handling client IP address allocation: Multiple clients will be able to connect to the bridge, and each client's TAP interface will be assigned an IP address that is part of the server's LAN. This example will guide you in configuring an OpenVPN server-side ethernet bridge. The ethernet bridge can be thought of as a kind of software switch which can be used to connect multiple ethernet interfaces (either physical or virtual) on a single machine while sharing a single IP subnet.īy bridging a physical ethernet NIC with an OpenVPN-driven TAP interface at two separate locations, it is possible to logically merge both ethernet networks, as if they were a single ethernet subnet. ![]() Ethernet bridges represent the software analog to a physical ethernet switch. Ethernet bridging essentially involves combining an ethernet interface with one or more virtual TAP interfaces and bridging them together under the umbrella of a single bridge interface. ![]()
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January 2023
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