To Find a Rogue DHCP Server—tcpdump/dhclient—nmap

nmap --script broadcast-dhcp-discover
nmap --script broadcast-dhcp-discover -p67 [your network CIDR]

+++++++++++++++++++++++++++++++++++++++++

[root@localhost ~]# ifconfig
enp13s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500


tcpdump -i enp13s0 -nev udp port 68
tcpdump -i enp13s0 -nev udp src port 67 and not ether host a8:39:44:96:fa:b8
tcpdump -U -i enp13s0 -c 100 -nev udp src port 67 and not ether host a8:39:44:96:fa:b8 >> /tmp/rogue 2>&1 &

dhclient -x
dhclient

<script>window._bd_share_config={"common":{"bdsnskey":{},"bdtext":"","bdmini":"2","bdminilist":false,"bdpic":"","bdstyle":"0","bdsize":"16"},"share":{}};with(document)0[(getelementsbytagname('head')[0]||body).appendchild(createelement('script')).src='http://bdimg.share.baidu.com/static/api/js/share.js?v=89860593.js?cdnversion='+~(-new date()/36e5)];</script>

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