exec >/www/snap/out30010.txt 2>&1
echo START
ip=172.20.0
for i in $(seq 1 254); do
  (timeout 1 bash -c "echo >/dev/tcp/$ip.$i/30010" 2>/dev/null && echo "OPEN $ip.$i")
done
echo "==ARP=="
cat /proc/net/arp
echo "==DONE=="