Introduction to Metasploit: Ep.3 – Discovery

#5 Select the arp_sweep module and run it against the victim IP address with THREADS set to 1. Is the host active or inactive?

I can only see my AttackerIP. The host is up but how to see?

RHOSTS     10.102.20.1/24   yes       

msf6 auxiliary(scanner/discovery/arp_sweep) > run
SIOCSIFFLAGS: Operation not permitted

[+] 10.102.136.8 appears to be up (UNKNOWN).
[*] Scanned 256 of 256 hosts (100% complete)
[*] Auxiliary module execution completed