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I changed configuration of /etc/sysconfig/network-scripts/ifcfg-eth1 and used ifdown and ifup to reset it. Then used ifconfig eth1 dhcp start it does not work and say:dhcp: Host name lookup failure. Are you know what caused it to behave so? distro:Fedora 12

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That's not the way ifconfig works. Your ifconfig invocation is understood as ‘configure device eth1, setting its address to be that of host start’. There's no host named ‘start’, so ifconfig fails.

If you configured the device correctly in /etc/sysconfig/network-scripts/ifcfg-eth1, all you need to do to run DHCP is to bring it up with ifup eth1.

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