Is this normal ? Should i do something ?
post a screenshot
attached
Any other computers connected to this cable?
No. Its a cable-modem which connects directly to a cisco linksys router which connects by cable to this computer. The cisco router also has wireless connection enabled and i have some devices on it.
All those devices use IP addresses.
Yes, but they are connected wirelessly to my router, not to my cabled computer. In the scan it shows these ips only when i click on details on my cabled computer, as if they were directly connected to it.
Now i really have an unknown device on my network using an IPv6 ip and a MAC address which is not in my MAC filter, which is activated.