Linux Make Sure /etc/resolv.conf Never Get Updated By DHCP Client

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I am 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 the different network. I would like to keep my existing nameservers. How do I skip /etc/resolv.conf update on a Linux based system? How do I stop DHCP client from changing resolv.conf on Linux?

Configuring Linux Static DHCP Clients by Sending Host Name

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Q. My DHCP server configured to assign static IPs to few Debian / Ubuntu Linux boxes using hostnames. My Windows 2000 and XP client computer sends hostname automatically. How do I send my hostname under Linux using dhcp client?
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