[Kea-users] Need to have DHCP Relay in order for Kea to work...?

[Ubence Quevedo]

Hi Everyone,



I’ve been using Kea for just under a year for a home setup on a Linux
Ubuntu server.  I switched from isc dhcp since it was end of life.  My
setup has a lot of MAC address reservations with some general pools for
systems that don’t have IP reservations.



I also have a few vlans set up with the reservations for devices on each of
the vlans.  I’m using pfSense as my gateway with some Unifi equipment that
is vlan aware.



I’m running into an issue and I’m not sure why and would love some advice
on how to look into this.



I have the interfaces on the system setup that is running Kea, to advertise
on the untagged network [mostly some servers], vlan 11 [user systems], and
vlan12 [IoT devices].



I don’t have the firewall in pfSense to block traffic between these
networks yet, so they can all freely talk to each other.



Even though I have my Kea configured to advertise on all of the interfaces
[untagged, 11, 12], I can’t seem to get anything to work unless I have the
DHCP Relay service setup on the pfSense device to redirect all DHCP traffic
to the Kea system’s untagged IP address [192.168.10.3].



I can verify through nmap that udp port 67 is running on all three
interfaces.



If I turn off the DHCP Relay service, I was expecting the interfaces to
pick up on the DHCP requests from devices on all of these networks.



This doesn’t happen and devices don’t get addresses.  I’ve even watched the
logs I’ve split out and nothing is written for the duration that the relay
service is turned off.  As soon as I turn it back on, I start seeing
traffic again.



I’m running Kea 2.6.0.



I’d love to turn the DHCP Relay off to then try to troubleshoot another
issue I’m having with bridging interfaces to VMs and then having the VM
interface assigned to a vlan other than the bridged interface.  It seems to
work for something else I’m doing, but just trying to rule some things
out.  Probably another post if I can figure out why the DHCP Relay seems to
need to be on.



Any ideas why I need the DHCP Relay service on another device even though
all of the interfaces on each respective vlan are configured to listen for
dhcp requests?


-Ubence
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