.. _dhcp: Configuring DHCP Server ======================= The Dynamic Host Configuration Protocol (DHCP) is a standardized network protocol used on IP networks. The DHCP is controlled by the Policy Server/Sensor that dynamically distributes network configuration parameters, such as IP addresses. You will be able to configure and manage the Built-In DHCP Options and configure Policy Server/Sensor to utilize the three DHCP Services. (Local, Remote, and Local & Remote) If you need to make custom configuration changes to a Network Sensor that is already in operation then you would use the **System > Sensor > Sensor Settings** option. Depending on your requirements you have three options for DHCP. (**Local**, **Remote**, and **Local & Remote**) .. image:: /images/Genian-NAC-DHCP-Options-1.png :width: 700px Configuring DHCP Services ----------------------------- - :ref:`dhcp-networks-sensor` Assign fixed IPs to devices -------------------------------- Genian NAC supports fixed DHCP IP allocation to analyze many environments to support situations in which some devices in the DHCP environment need to have static IP allocation. #. Go to **Management** in the top panel #. Check the left side check box of the terminal to assign a static IP. #. Click Select **Task** > IP/MAC Policie > Enable Conflict/Change Prevention - When you set conflict protection and change prevention, the IP is assigned only to the setup device. Managing DHCP Leases -------------------- It is a function to inquire and delete the DHCP IP assigned to the device by the DHCP server. This feature is only available through the CLI(Command Line Interface). **Show DHCP Lease status** .. code:: bash genian# show dhcp lease all IP Address MAC Expire Interface --------------- ----------------- ------------------- ----------- 172.29.30.152 00:24:21:3D:65:C4 2018-08-06 20:10:13 eth0 172.29.30.154 00:90:FB:26:7D:24 2018-08-06 19:10:24 eth0 172.29.30.155 AC:3C:0B:3C:01:70 2018-08-06 20:10:21 eth0 **Clear DHCP Lease status** .. code:: bash geinian# clear dhcp lease ip 172.29.30.152 genian# show dhcp lease all IP Address MAC Expire Interface --------------- ----------------- ------------------- ----------- 172.29.30.154 00:90:FB:26:7D:24 2018-08-06 19:10:24 eth0 172.29.30.155 AC:3C:0B:3C:01:70 2018-08-06 20:10:21 eth0