It does not have to be a gateway to be a DHCP server but I am guessing you are using your router as the DHCP server is that what you are saying?
If so then you will need to setup a reservation in your router for the servers IP address so that it does not cause a conflict by giving the IP out to another computer.. As suggested you may want to use your server for DHCP instead of your router because it is easier to configure on the server.
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