opnsense broadcast itself's serial number UUID IP via some discovery proto?

[TheLinuxGuy]

I have two opnsense installs:
- True ISP WAN let's call it "primary"
- and "backup" opnsense which has a bunch of VMs in it.

"backup" WAN is connected to "primary" LAN network.
On Windows I noticed the "backup" is broadcasting some sensitive information to the outside world about itself: serial number, unique identifier, software version as "FreeBSD router"

How do I stop this and where is it configured?

[fabian]

You may have a service enabled that does this. FRR uses Broadcast and Multicast for example.