Hello, there is nice tool arp-scan (http://www.nta-monitor.com/tools/arp-scan/index.html) that supports near parallel arp pinging. Example: arp-scan --interface=eth0 172.18.0.0/28
We already use it to monitor our internet clients and successfully integrated it to our management interface. Since we also use routeros routers, it will be good to use fast pinging from routeros routers. Routeros API interface would be best interface to call this tool.
Hopeless thanks