DHCP Penetration Testing

DHCP stands for Dynamic Host Configuration Protocol and a DHCP server dynamically assigns an IP address to enable hosts (DHCP Clients). Basically DHCP server reduce the manually effort of administer of configuring IP address in client machine by assign a valid IP automatically to each network devices. A DHCP is available for distributing IP address of any Class among: A B C D E basis on their netmask description which means it is applicable even for small network or a huge network.

DHCP uses UDP as its transport protocol. The client sends messages to the server on port 67 and the server sends messages to the client on port 68.

There are three mechanisms used to assign an IP address to the client. They are:

• Automatic allocation – DHCP assigns a permanent IP address to a client
• Manual allocation – Client’s IP address is assigned by the administrator, DHCP conveys the address to the client.
• Dynamic allocation– DHCP assigns an IP address to the client for a limited period of time (lease).

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