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Nevermind it seems that putting the gateway on the MGMT interface was indeed correct but that a reboot was required to make it work.

Hello, I'm a total beginner with opnsense so apologies if I did something stupid.

I'm trying to configure opnsense as a transparent filtering bridge (because I'd rather keep using my FritzBox as a router for both Wifi and wired clients).

My opnsense device has 3 ports:

• port 0 (WAN) is connected to my modem/router
• port 1 (LAN) is connected to my main switch
• port 2 (MGMT) is a management port

The bridge is composed of the WAN and LAN interfaces.

My current configuration seems to be mostly working except that opnsense itself has no internet access, which means I can't get updates or install plugins.

I have tried to follow this guide: https://homenetworkguy.com/how-to/configure-opnsense-transparent-filtering-bridge/

But I have an issue at step 7.1, if I try to add a gateway for the management interface then it fails saying that the IP already exists (which is true: my router is already defined as a gateway on the WAN interface).

What am I supposed to do here? If I put the gateway on the MGMT interface instead of the WAN interface then I have no internet access from the LAN.

If I connect to the console I can see that there is no default route:

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Internet:
Destination        Gateway            Flags         Netif Expire
127.0.0.1          link#5             UH              lo0
<LAN subnet>    link#3             U              igc2
<MGMT IP>      link#5             UHS             lo0
If I add a route manually using

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route add default <router IP>
then opnsense has internet access but that only works until the next reboot and it obviously isn't clean...