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Troubleshooting Question

Can a TCP/IP network have multiple devices whose gateway IP is identical?

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Last Modified: 2020-08-19
We have a cellular network providing IP addresses to a server and in-vehicle computers via cellular modems.

The modems are set to a pass through configuration, so the computer has the IP address the modem receives. These IP addresses are tied to the SIM card and are static.

However when in this mode the modems give the local computer a gateway IP address of 10.10.210.1.  By this you can conclude that our IP addresses are all 10.10.210.x.
All of the modems, including the server, share this gateway IP address.

We have communication problems on this network.  Nothing can talk to anything else. I'm working with the modem manufacturers (Sierra Wireless and Digi) to go through setup procedures, but that is going to take days to get organized.  I'm hoping for a faster answer here and at least to eliminate a concern I have.

Is the Gateway IP a "local" IP and not exposed to the remainder of the network?  For example on the server if I try to go to the gateway IP of 10.10.210.1 I get the admin interface for the Digi modem connected to it.  But I'm concerned that 10.10.210.1 being on multiple devices on the network is causing a conflict, and thus our communication problems.
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