[NR7302] IP passthrough not working

mbo77

I'm running the device on 1.00(ACHA.4)b5_F0 and it's connected to the Telekom network in Germany.

I'm trying to get IP passthrough working correctly. So I connected it to a dedicated port on a OpenWRT router and IP passthrough is set to dynamic mode.

I can see that the mode is enabled and the device even shows the associated IPv4 address.

But the OpenWRT doesn't receive the address via DHCP. With tcpdump on the interface I can monitor the broadcasts but no answers come through.

There was a hint about disabling the firewall on the Zyxel but I don't see any difference.

Anyone with success who can assist me?

mbo77

OK, the solution was simple, and maybe I missed it in the manual.

On the bridge itself containing the APN, DHCP must be active, even if there is no particular interest in the network. For management reasons, I connect to the device via WiFi or one of the VLANs tagged.

My understanding was that IP passthrough would serve DHCP requests.

In case, somebody else encounters the same problem.