Hi, posted this as an update to an existing thread but thought better to create a new post as that one is long since solved.

I have a USG sitting behind a mikrotik LHG LTE antenna and all has been working fine foe some years. I'd like to upgrade this to a UDM now and following the guide set out in the post, viewtopic.php?p=1047366#p1047366, I've setup the UDM WAN settings to vlan 30 and configured dhcp and updated the mac address in routeros but I don't get anything passed through. Reverting the mac in routeros back to that of the USG and everything works fine. I've tried resetting the config in routeros incase there was something hard coded but to no avail.

Any thoughts??