When I was tried arp -a on windows 10 it is not showing all the devices, even after ping to gateway IP address.
Answer
The results you mention make sense to me.
When you run “arp -a”, your system will show IP addresses and MAC addresses that it noticed within the cache timeout period, on a subnet that your computer is a part of. However, if another laptop communicates with your Wi-Fi gateway and that traffic goes to the Internet or to a local printer, your computer is not part of that conversation. So your computer will ignore such communication, and not notice it, and not enter such information into the ARP table.
(I suspect this might operate differently with Ethernet connections if you use a hub. However, hubs are older devices that most people don’t use, primarily because they operate at slower speeds since they are now older devices. Instead, people tend to use switches these days, and a switch doesn’t typically broadcast traffic. So, if a switch is used, your desktop wouldn’t unnecessarily receive the traffic, and so your desktop wouldn’t notice the ARP traffic. By the way, a router acts like a switch, and a firewall, “cable modem”, and “DSL modem” all act like a router.)
Maybe you should explain why this doesn’t make sense to you, or what you are trying to accomplish. Maybe what you are trying to accomplish can be done by looking at the ARP table of the gateway device. How to do that will depend on the gateway device. If it runs some sort of Unix-like environment, running “arp -a” works there as well. You may find that accessing that with HTTPS will provide a way to look at the ARP tables.
(If reading this has led you to a new understanding, but also caused a distinct new question, then consider accepting the best, most helpful answer to this question, and making a separate question on Superuser. We tend to not like “evolving” questions, because that tends to lead to older useful answers becoming less relevant to the newer question. However, if you feel that your original question is still relevant but just needs more clarification, then edit your original question.)
Attribution
Source : Link , Question Author : Appi Devu , Answer Author : TOOGAM
