sudo nmap -sP 10.8.0.0/24
(substituindo o endereço IP conforme necessário) funciona para mim.
Os resultados parecem
Starting Nmap 7.01 ( https://nmap.org ) at 2018-04-06 18:49 CDT
Nmap scan report for 10.8.0.8
Host is up (0.21s latency).
Nmap scan report for 10.8.0.1
Host is up.
Nmap done: 256 IP addresses (2 hosts up) scanned in 17.27 seconds