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Ping machine once, waiting 1 second for response until failing. Upon fail, ssh globally, otherwise ssh locally.
There is 1 alternative - vote for the best!
If you can do better, submit your command here.
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+1
if you allow me I would add
for i in {1..254}; do ping -c 1 -W 1 10.1.1.$i | grep 'from'; done
how to find the computer turned on in your network
and
sudo arp-scan 192.168.1.0/24 -interface eth0
how to find the routers...