Enabling DHCP


Enabling DHCP service on a specific interface where connected devices will have their respective IPs automatically assigned with the next available IP within the specified range.


  • Netgate SG-3100 Switch
  • 2 Ethernet Cables (WAN & LAN)


Task 1: Access PFSense from switch

Step 1: Make sure your device is connected to the switch via LAN port with an Ethernet cable.

Step 2: Access the GUI via default LAN IP (

Task 2: Changing the LAN IP

Step 1: Go to Interfaces > LAN.

Step 2: Under Static IPv4 Configuration, change the IPv4 address to your desired IP. For this guide, the IP is changed to with a subnet of 24. Make sure the upstream gateway is set to None.

Step 3: Save and Apply Changes.

Step 4: You may be getting a HTTP_REFERER error as soon as you changed the IP address. This is because you have not added an Allow All rule onto your LAN interface.

Step 5: Access the GUI again with the new IP after adding the rule (

Task 3: Enable DHCP service on LAN interface

Step 1: Go to Services > DHCP server > LAN

Step 2: Enable the DHCP service

Step 3: Specify the range of IPs available for devices.

Step 4: Specify the DNS Servers

Task 4: Test the Configuration

Step 1: On your local computer (Windows), right click on Network icon and select ‘Open Network and Sharing Centre’.

Step 2: Click on ‘Change adapter settings’.

Step 3: Right click ‘Local Area Connection’ and select ‘Status’

Step 4: Select ‘Details’

Step 5: On the Network Connection Details, if you see your local computer using the first available IP from the specified range (In this case, Your DHCP service is working.

Updated on June 5, 2020

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