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1. Already booted server and same network.
ping to same network's broadcast. (ping -b  192.168.122.255) or using namp
find arp table ( arp -an | grep <mac address> )


2. Catch DHCP request signal from booting server.
$ sudo tcpdump -i <eth interface> -en | grep -e "\.mdns" -e "igmp" | grep <mac address> | awk '{print $10}'

it need tcpdump command
$ rpm -qa |grep tcpdump >& /dev/null || sudo yum install tcpdump

ex) sudo tcpdump -i eth1 -en | grep -e "\.mdns" -e "igmp" | grep "52:54:00:05:3b:88" | awk '{print $10}'
2019/09/17 07:44 2019/09/17 07:44
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