First and second floor found
Kali Linux can use the ARP protocol host found
Disadvantages: can not cross route discovery
1, arping (single target)
2, netdiscover (multi-objective)
Two, three found
Using ICMP protocol
Disadvantages: the firewall is easily filtered, found slower than Layer
1, ping (single target)
2, fping (multi-objective)
3, hping3 (custom packet)
Three, four found
You can use TCP, UDP
Disadvantages: it takes longer than two, three
1、nmap
2、hping3