dynamic host configuration protocol

How do I renew a dhcp assigned IP address under Ubuntu Linux desktop or Laptop systems?

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I’m using FreeBSD 7.2 on HP laptop and getting IP info via WI-FI router. I’ve setup hostname in /etc/rc.conf buy after the boot process, I check host name with “hostname” command, but get empty line. Setting hostname with “hostname” works well, but after reboot host name is still empty. I suspect it has something to do with DHCP settings. How do I set hostname-using DHCP?

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Q. I’m using GNU/Linux with the Internet Systems Consortium DHCP Client. dhclient, provides a means for configuring one or more network interfaces using the Dynamic Host Configuration Protocol. It also updates my /etc/resolv.conf each time my laptop connects to different network. I would like to keep my existing nameservers. How do I skip /etc/resolv.conf update?

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Q. I’m getting following error on my Debian Linux system: mv cannot move /etc/resolv.conf.dhclient-new to /etc/resolv.conf: Operation not permitted How do I fix this problem?

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