DHCP client with bridged NIC

[mauro]

Dear all,

I'm strugleing to figure out how to make this work.
I have a modem/router with Openwrt with 3 LANs (LAN, DMZ, DMZ_2), and for all of these there is a DHCP server.
I want to change the router/firewall from zeroshell used in DMZ to opnsense used in DMZ_2

Opnsense run on APU2c4.
I have 2 NICs bridged configured with DHCP client. opnsense receive the IP from the DHCP server when connected to the Openwrt main router.
the issue is that if I plug a pc to the second NIC of the bridge, the pc doesn't receive the IP. In other terms the bridge in Opnsense doesn't forward the DHCP server information.

Can I have some hints?

I've tried also to reverse the setting with DHCP server on Opnsense and Openwrt as client but with this I get really confused with routes and gateway and I can't figure out how to access the open internet from DMZ_2 machines...

To be honest I don't know which is the best or correct way of doing it. I have the actual configuration with Openwrt in charge of al DHCP server and works so far and it make sense to me

cheers

[Patrick M. Hausen]

Did you set the two tunables as in the OPNsense documentation?

https://docs.opnsense.org/manual/how-tos/lan_bridge.html

[mauro]

Dear all, thanks for help.

After few more tries and a further study I managed to get the following configuration working with DHCP server on Opnsense and openwrt as client.

To get access to internet from the DMZ I created a static route with destination o.o.o.o/o and gateway the DMZ interface

I hope this will help someone else

regards