You need to configure the MikroTik to acknowledge the relay as a valid relay source. If your DHCP server instance is zero and the ethernet-to-coax gateway’s IP is 192.0.2.1, then you can do this:
Hi, I did see these instructions, and tried to enter the LAN IP of “coax to ethernet converter router” in there, but that didn’t seem to work. I also tried to enter 255.255.255.255 in there - which supposedly should allow “any” DHCP relays? No luck on that one too.
Is there anything else to using a relay than this?:
/ip dhcp-server
set 0 relay=192.0.2.1
Do I need to do anything with the src-address in the dhcp-server?