The gateway must be in the same network you are.
If your workstation is in 192.168.10.0/24 network, than your gateway must be in the same network. In other words, you must have a gateway in the 192.168.10.0/24 address space.
Here, I made a assumption you have a 24 bit network (255.255.255.0) since you don't provide the complete information about your network settings.
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