How to get MAC of DHCP server on WAN

Hi

My MikroTik WAN connects to a network where we sometimes have rogue DHCP servers.
How do I get the MAC address of the DHCP server that issued my MikroTik its IP address?

On my own machine I’d do it using arp -a, but I don’t know how to use arp like this on the MikroTik WAN.

Help?

P.

I found out how to print the MAC addresses using ARP:
“ip arp print”

And I found out how to get the IP address of hte DHCP server:
“ip dhcp-client print detail”

Now, how to get the MAC address of the DHCP server IP, given that the DHCP server IP is not listed in the ARP table?

Thx
P.