Discovering active hosts
If you want to discover all the active hosts on your subnet from your routers console, you can perform a ping in the broadcast address of your subnet. Keep in mind that all the active nodes on your subnet should respond to that ping. As a tip I can tell you that this kind of ping will only work in privileged exec mode.
For example if you use the subnet 10.1.1.0 /24 the broadcast address is 10.1.1.255
From privileged mode perform a ping like this:
Router#ping 10.1.1.255
A “list” with all the active nodes should appear.
Another command that you can use to find out with witch hosts has the router communicated is
Router#show ip arp
You can use this useful type of ping for many types of things, for example to check how many computers are connected on a wireless network. Till our next article, stay tuned.
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