Configure Linux DHCP client ( dhclient ) to persistently look for an IP address lease

by on December 24, 2007 · 1 comment· LAST UPDATED December 24, 2007

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Q. I've HP Laptop installed with CentOS 5 workstation operating system. How can I configure Linux dhclient command to continuously requests an IP lease until one is granted by DHCP Server / Router?

A. You need to set the PERSISTENT_DHCLIENT option by editing Ethernet configuration file. This option is turned off by default.

Login as the root user

Open /etc/sysconfig/network-scripts/ifcfg-eth0 file to set eth0 to persistently look for an IP address lease:
# vi /etc/sysconfig/network-scripts/ifcfg-eth0
Append line PERSISTENT_DHCLIENT=1, at the end configuration should look as follows:
DEVICE=eth0
ONBOOT=yes
BOOTPROTO=dhcp
PERSISTENT_DHCLIENT=1

Save and close the file. Restart networking service or reboot laptop / desktop to test the changes:
# /etc/init.d/networking restart

Please note that your network switches and other protocol may need to configure properly to work with this option.

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{ 1 comment… read it below or add one }

1 skynet May 13, 2009 at 9:32 pm

“Save and close the file. Restart networking service or reboot laptop / desktop to test the changes:
# /etc/init.d/networking restart”

should be:
# /etc/init.d/network restart

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