The /etc/resolv.conf file holds the IP addresses for your DNS servers along with domains to search. A DNS entry will begin with the term nameserver followed by the name server's IP address. A search entry will list network domain addresses. Check this file to see if your network DNS servers have been correctly listed. If you have a router for a local network, NetworkManager will automatically place an entry for it in this file. The router in turn will reference your ISP's name server.
/etc/resolv.conf nameserver 192.168.0.1
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