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)

This article shows how to create default settings to be applied to newly added Network Sensors so you do not have to configure each one manually.

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)

To Configure Default DHCP Services

  1. Go to System in the top panel
  2. Go to System Defaults > Network Sensor in the left System Management panel
  3. Find DHCP section in Network Sensor window. Select On in DHCP Service
  4. Based off of your network environment, choose one of the Service Target below
  5. Find Node IP Pool section and reserve an IP range of IP Addresses (e.g.192.168.10.2-100)
  6. Find Lease Duration and define when an IP expires (Minutes, Hours, Days, or Months)
  7. All other settings are optional
  8. Click Update

To Configure DHCP Services To Network Sensor In Operation

  1. Go to System in the top panel
  2. Go to System > Sensor in the left System Management panel
  3. Find and click IP/Name of Network Sensor
  4. Find and click Settings tab
  5. Click Sensor Settings
  6. Find DHCP section and select On in DHCP Service
  7. Based off of your network environment, choose one of the Service Target below
  8. Find Node IP Pool section and reserve an IP range of IP Addresses (e.g.192.168.10.2-100)
  9. Find Lease Duration and define when an IP expires (Minutes, Hours, Days, or Months)
  10. All other settings are optional
  11. Click Update
../_images/Genian-NAC-DHCP-Options-1.png

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

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

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