dhcrelay issue

[DukeSniper]

Hi y’all,

I have some trouble getting dhcrelay to work properly in my setup.

I have a client behind a OPNsense box, which is connected to my corporate network via OpenVPN. The OPNsense box has the dhcrelay configured to relay all DHCP requests to my DHCP server. When the client issues a DHCPDISCOVER, I can see the agent request reaching my server, and a proper DHCPOFFER is being sent back to the OPNsense box. A packet capture on said box on the OpenVPN interface shows the packet arriving, but it‘s not being forwarded to the client.

From what I‘ve read in the ISC DHCRelay package docs, it‘s probably because the service is bound to the LAN interface only, where it should at least have the OpenVPN interface be defined as upstream interface. But the GUI does not permit testing this assumption.

Question 1: how can I manually start the dhcrelayd with custom command line switches to test my assumption?

Question 2: If my tests prove my assumption to be correct, how do I add the command line switches in a reboot persistent manner?

Question 3: should I file a bug report on GitHub?