I am trying to configure a SSTP server on a linux machine using SoftEther to which I intend to connect a lot of mikrotik routers so that I can manage them remotely. I installed the server and tried to configure DHCP for my hosts but I hit a snag , the clientid and hostname that the mikrotik sends in the DHCP discovery is the virtual mac address generated for the SSTP-client interface , and the hostname is the IP address on the wan interface, I tried to change the hostname to the serial number by entering the value in the dhcp-client options but it doesn't work ( the values in the dhcp discovery are still the same). My question is how can I configure my dhcp server and mikrotik so that I can provide the IP addresses based on the serial number of the device or the mac address of the wan interface.

Have you managed to configure Mikrotik SSTP connection to SoftEther ?