Introduction

Having moved from ISC to Kea on Opnsense it was a fairly straightforward process although I done it manually.

Enabling Kea DHCP

• From Services browse to Kea DHCP and then Control Agent tick Enabled
  • Keep Bind Address and Bind Port as the default selection.
  • Always remember to hit apply!
• From Kea DHCP v4 select the following:
  • Service –> tick enabled
  • Interfaces –> Select the interfaces you want it to apply to. My example is IoT, Trusted and LAN
  • Valid lifetime –> My devices don’t really change so I extended it to 86400. This is in minutes.
  • Firewall rules –> enabled
  • Socket type –> RAW

Subnets

• Click + to add a new subnet
  • Subnet – 192.168.10.0/24 – my example
  • Description – Trusted
  • Pools – 192.168.10.100 – 192.168.10.254 – I’ve started mine at .100 as I tend to set reservations for each device.
  •  Auto collect option data – I unticked this as I found none of my devices were going through adblock.
    • DNS – If you have Pi-hole or Adblock be sure to set your DNS server here for each subnet.

Reservations

• Click + to add a new reservation
  • Subnet – select the subnet from the list, 192.168.10.0/24 – my example
  • IP Address – 192.168.10.10
  • MAC address – enter the Mac of the device
  • Hostname – Enter a name for the device
  • Description – Finally, a description.