OpenBSD: Configure Network Interface As A Bridge / Network Switch

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To configure a network interface as a bridge in OpenBSD, you need to use the “ifconfig” command. A bridge is a device that connects multiple network interfaces together, allowing traffic to be passed between them.

Here’s an example of how to configure a bridge interface in OpenBSD:

  1. Create the bridge interface:
ifconfig bridge0 create
  1. Add the physical interfaces to the bridge:
ifconfig bridge0 add em0
ifconfig bridge0 add em1

Replace “em0” and “em1” with the names of the physical interfaces that you want to add to the bridge.

  1. Configure the IP address for the bridge:
ifconfig bridge0 inet 192.168.1.100 netmask 255.255.255.0

Replace “192.168.1.100” and “255.255.255.0” with the IP address and netmask that you want to use for the bridge.

  1. Enable the bridge interface:
ifconfig bridge0 up
  1. To persist the bridge configuration across reboots, you can add the following lines to the “/etc/hostname.bridge0” file:
up
inet 192.168.1.100 255.255.255.0
add em0
add em1

This is just an example of how to configure a bridge interface in OpenBSD. You can customize the configuration to meet your specific needs by using different IP addresses, netmasks, and interface names.

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