Possibly a router not having updated the script to 3.2 after upgrade to ROS 6.41 and later.

Yes, that would be the reason for sending MNDP broadcasts. Actually I don't mind that those are sent, it can be useful as it provides the info I gave in the first post. But of course it would be nice when system->identity is changed e.g. to the callsign so it is easier to contact people when something is wrong.

However, the main issue is that it is using a public IP that is not in the gateway list so these packets cause a log message and are dropped here. Likely the public IP has changed without the owner noticing it or without him realizing that he needs to update the portal entry. (of course this can be avoided when using a DNS name in the portal and some dynamic DNS update script, or even simply "IP Cloud" when this MikroTik is directly in the public IP)

Rob