Cisco Packet tracer - Static Routing using CLI
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Sorry for the unexpected ending there. For setting the DNS you gotta set the DNS address in every device.
For that click on the device, go desktop menu. Press the IP configuration and put the IP address of your server on the "DNS Server" field. Then go to desktop menu again. Visit the web browser window. Place the DNS name according to what you set on the serve. Press go and wala.