dhcpwn: add page

pages/common/dhcpwn.md

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+# dhcpwn
+
+> Test DHCP IP exhaustion attacks and sniff local DHCP traffic.
+
+- Flood the network with IP requests:
+
+`dhcpwn --interface {{network_interface}} flood --count {{number_of_requests}}`
+
+- Sniff local DHCP traffic:
+
+`dhcpwn --interface {{network_interface}} sniff`