I'm using my routerboard as a wireless bridging client (station-pseudobridge). I'm trying to make it "silent" and have disabled Mikrotik Discovery protocol and removed the IP address (management over serial).
However, I can see with my sniffer that the routerboard is periodically (every 20 seconds) sending an LLC frame. It indicates that the network protocol (LLC type) is IP (0x0800) but there is no payload. So Wireshark says they are malformed.
Any idea what these frame are? What they are for? And if this behavior can be disabled?