It’s effectively a host-firewall-proof ping mechanism to see if something is still on the network. AWS does something similar with their guest OS reachability checks. Even if your system is blocking all inbound traffic it still has to respond to ARP requests for IP networking to basically work.
It’s effectively a host-firewall-proof ping mechanism to see if something is still on the network. AWS does something similar with their guest OS reachability checks. Even if your system is blocking all inbound traffic it still has to respond to ARP requests for IP networking to basically work.