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In theory yes. You will need to find a configuration setting in the router that allows you to change the default LAN IP range settings of the router. The router's range will need to be the same of you network.
You will also need to set the router LAN IP as a gateway in each workstation's IP settings so as to get out onto the internet.
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However, to avoid confusion, you probably do not want the IP range of your LAN, to be in the same range as the IP issued by the modem to the router's WAN port.