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How To: Make Sure /etc/resolv.conf Never Get Updated By DHCP Client

I'm using GNU/Linux with the Internet Systems Consortium DHCP Client. The dhclient, provides a means for configuring one or more network interfaces using the Dynamic Host Configuration Protocol. It also updates my /etc/resolv.conf file each time my laptop connects to different network. I would like to keep my existing nameservers. How do I skip /etc/resolv.conf update on a Linux based system?
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How Do I Update The Root Hints Data File for BIND Named Server?

Q. My local nameserver root zone file is outdated. It has no information about IPv6 and recently changed root server IP address. How do I update my root hints data file under Debian and Red Hat Bind 9 server?
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