To Find a Rogue DHCP Server—tcpdump/dhclient—nmap
2016-02-01 00:00
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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
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
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