Hello i have on ether1 a pppoe with my modem LAN1 (bridge mode), the modem have 4 LAN on LAN1 i have a cable to my mikrotik for the pppoe.
The question is it possible to have dhcp on the ether1 and pppoe client connection to the modem?
because on the modem i have 2 devices connected on LAN2&3 and run the modem like a switch and as bridge?
Thanks in advance for your help.
Yes, this is possible. At one site I do use a modem in bridge mode the same way, terminating the PPPoE on Mikrotik and using the modem as an additional LAN switch in parallel, so the DHCP server for the LAN and the PPPoE client are both attached to the same interface of Mikrotik. The only thing I’d strongly recommend if technically possible is to set up filtering rules at the modem so that only PPPoE frames would be allowed to get to the DSL line, otherwise you’ll spam the uplink with all the broadcast traffic of the LAN, such as ARP requests, DHCP DISCOVER requests, Mikrotik neighbor discovery, …, wasting your bandwidth and disclosing information about your private network.