We are using a TRB500 in bridge mode to provide Internet connectivity to a Unifi gateway.
The concrete problem we are facing is that the Unifi gateway sometimes receives a local (192.168.2.x) IP address from the TRB500. This seems to happen when the LTE link has not yet come up, or is down for whatever reason.
The immediate question is: how do we stop this behavior, so the gateway can keep sending DHCP queries until the LTE link is up, and it can get a proper WAN IP? I found some earlier discussions on this topic in these forums, but no clear solution.
My more general question is: couldn’t we please get a real, transparent bridge mode on the TRB500, without this “man-in-the-middle DHCP masquerading” weirdness?
We’d be happy to use either a VLAN or static routing to access the TRB500 for configuration.
Thank you for reaching out. In this case, to assist and troubleshoot this issue effectively, we’ll need to continue this process privately, because sensitive/publicly unshareable information, such as the troubleshoot file, public IP addresses, serial numbers, etc., needs to be gathered. You should find a support request form in the inbox of the email address you used for your forum registration. Kindly fill out the form, and please reference Ticket ID: 15138 when submitting it. Once the form is completed, we’ll contact you directly via email to investigate the issue in detail and help work towards a solution.
Bridge mode technically is impossible with modem, because mobile network operate only in L3. It does not have MAC addresses, ARP protocol and other necessary components to work in standard network. Even DHCP server is emulated in modem for host and is optional, some modems do not have it at all. So you will always face modem host which will handle these shortcomings in one way or another.
