<p>I'm trying to confirm a user a unplugged my embedded device from a network before performing some maintenance. I'm considering "ping"ing all IP address on my sub-net, but that sounds crude. Is there a broadcast/ARP method that might work better?</p>

You can try a broadcast ping (this is from linux):
```
```
ping -b 255.255.255.255
```
```
Another option is to download
Nmap
and do a ping-scan.