Anyone have any clues as to why a MikroTik RB750Gr3 will not gather DHCP [client] settings from a Comcast Business rtr/mdm in Bridge Mode? …but a laptop will !
Cheers
Perhaps the modem has a limit to how many IP addresses it will assign to clients, and it still remembers the MAC address of the laptop?
Does it work if you reboot the modem between attempting with PC and attpempting with Mikrotik?
Does it work if you set the MAC address on the Mikrotik’s wan interface to be the same as the PC’s MAC address?
You could always wireshark the DHCP communication between your PC and Comcast, and then use the sniffer tool to capture the Mikrotik<>Comcast traffic and then compare the two packet captures.
In my experience with Comcast business, their business modems are actually Cisco routers and they don’t actually bridge but instead route a public IP subnet to the LAN interface (e.g. a /28) but they may have changed this since the last time I came across one.