How to test what is alive in the VLAN? arping, arp-scan

Problem: How to test VLAN/subnet without IP address from it. I need to to know if GW (gateway) is present/answering and what else is alive in this subnet.

If you can’t use IP address, you can’t use common test tool PING. You have to use layer-2 (ethernet) based solution – ARP protocol.

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