I had written earlier about the arp command to check all the hosts on the network, but sometimes that does not work. It turns out nmap does a good job. Referencing https://www.redhat.com/sysadmin/quick-nmap-inventory
nmap 192.168.0.0/24
does a full scan of all hosts,
(4 hosts up) scanned in 24.17 seconds
nmap -sn 192.168.0.0/24
does a quick scan, which only shows which hosts are up - in around 4 seconds.
The link above even shows how to do a packet trace using nmap,
# nmap -vv -n -sn -PE -T4 --packet-trace 192.168.2.3
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