OPNsense Forum

English Forums => 26.7 Series => Topic started by: psehorne on September 06, 2026, 11:27:17 PM

Title: Transparent Filtering Bridge: How configure Ethernet port as a management port?
Post by: psehorne on September 06, 2026, 11:27:17 PM
Hello, group.

I did a search for an answer to my problem but did find any help.

I'm trying to set up newly installed OPNsense 26.7 (my first installation of OPNsense) as a transparent filtering bridge between my ISP and my router. I cannot access the GUI via my management port.  I can access it via the LAN port, and both ports are configured the same except for the IP address.

The machine is a mini PC with two real Ethernet ports (LAN re0 and WAN re10).  I added a USB Ethernet to us as the management port (MGMT ue0).
With the Ethernet cable from  my PC connect to the LAN (re0) port I can access the GUI.  With it connected to the MGMT (ue0) port I cannot access the GUI. (I have verified the USB Ethernet adapter works properly and that the Ethernet cables I am using are fine.)

There is a bridge also configured whose members include LAN, WAN, and MGMT.

The LAN port (192.168.1.35) and the MGMT port (192.168.1.36) both have an IP address.  From the LAN port I can ping both IP addresses.  From the MGMT port I cannot access the GUI, and pings from my PC timeout.

I have also tried giving the bridge an IP address (192.168.1.37).  From the LAN port I could access the GUI and ping all three IP addresses.  From the MGMT port I cannot ping any of the three address and cannot access the GUI.

Before I add any restrictive firewall rules, I have added firewall rules allowing packets from each port to pass unrestricted.  This works.  When I place the mini PC between my router and the ISP I can access the internet as expected.  However without a working MGMT port I cannot administer the OPNsense instance.

Any ideas from the group as to how to configure this setup?

Thanks,
Paul