I've got several computers with Debian Buster (Gnome) installed. Thanks to psad tool I realized that all of them frequently (at least several times a day) scan udp ports 8610-8612 in the local network.
I wonder what is the purpose of this? What package or service does that? DuckDuckGoing didn't help and I have no idea how to get into this.
I blocked outgoing connections on those ports on some of the computers using firewall and didn't notice any malfunction of any part of the system.
Below you can see a part of psad-alert e-mail:
Danger level:  (out of 5) Scanned UDP ports: [8610-8612: 4 packets, Nmap: -sU] iptables chain: INPUT (prefix "[UFW BLOCK]"), 4 packets
There is something that may (or may not) be relevant - psad alerts show ipv6 of the source and target, while we generally use only ipv4 in the LAN.