November 2017
Intermediate to advanced
226 pages
5h 59m
English
Content preview from Python Penetration Testing Cookbook
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DHCP starvation
DHCP is the protocol that helps to assign clients' IP addresses to the LAN. The process of assigning DHCP consists of four steps--DHCPDiscover, DHCPOffer, DHCPRequest, and DHCP ACK.
DHCPDiscover is the first step where the client broadcasts in the LAN to find a DHCP server that can provide an IP for the client. Then the server will respond with a unicast DHCPOffer, where it offers a possible IP. Then, the client will broadcast the DHCPRequest with the IP to all networks, and finally the server will respond with a DHCP ACK or DHCP NAK. ACK represents a successful DHCP process, while NAK represents when the IP is not available:
The DHCP server stores the IP information to MAC bindings. If we ask for too many IPs from the DHCP ...
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