Sorry if I don´t get it, but as in my last post:
Can you explain which settings these are on this screenshot? I know something in the DB, but what exactly?
I would have thought you just have the DB, connected the MX to one of the LAN ports of DB - forwarded 500/4500 to the MX (Lan Port or IP).
And another time, what about the packetcaptures on MX regarding to the ports 500/4500 as @ww mentioned.
Network Wide - packet capture
Instead of wireshark you can view the output below as well.
![MarcP_0-1648461290036.png MarcP_0-1648461290036.png](https://community.meraki.com/t5/image/serverpage/image-id/22505i2475E0C516EC5253/image-size/medium?v=v2&px=400)