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pfSense Bridge LAN and OPT1 | How-to Guide

by | Oct 12, 2023

Learn how to create a bridge between LAN and OPT1 interfaces in pfSense. Our pfSense Support team is here to help you with your questions and concerns.

How to create a bridge between LAN and OPT1 in pfSense

Did you know that creating a bridge between LAN and OPT1 interfaces in pfSense can be useful in different cases?

How to create a bridge between LAN and OPT1 in pfSense

For instance, it comes in handy when we want both networks to be on the same broadcast domain or if we need devices on different interfaces to communicate as if they were on the same network.

  1. To begin with, we have to change the kernel parameters as needed.
  2. So, head to System > Advanced > System Tunables.
  3. Then, we have to change these two settings:

    net.link.bridge.pfil_member = 0
    net.link.bridge.pfil_bridge = 1

  4. After that, we have to save the changes.
  5. Then, go to Interfaces in the WebGUI, enable OPT1 and save the changes.
  6. Next, go to Interfaces, followed by Assign, and head to Bridges. Then, assign OPT1 only and click Save.
  7. Now go to Assign under Interfaces and change LAN from the current assignment to BRIDGE0. This removes your access. So, we have to switch to OPT1 to continue.
  8. After that, we have to change the LAN from the current hardware address to BRIDGE0 as the interface. Then, add OPT2, which is the old LAN interface hardware address. Remember to enable OPT2 and then add it to the bridge.
  9. Finally, restart the dhcpd server for the changes to come into effect.

Let us know in the comments if you need further help with this.

[Need assistance with a different issue? Our team is available 24/7.]

Conclusion

In brief, our Support Experts demonstrated how to create a bridge between LAN and OPT1 interfaces in pfSense.

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