I have noticed that when clients come to our office and when they use our WIFI or if they use our Ethernet connection I can see theirs Laptops on my DHCP lease and also on network mapping. Could you tell me how to block it and why is it happening ? they are not in my Domain so how can I see theirs laptops on my server and network?
Is there any way to put Security rules for DHCP ?
thank you for help