the -timeout option specifies how many seconds will dhclient goes to background when there is no valid dhcp response.<br />
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When assigned a value less than or equal to 3 seconds, dhclient will stuck in a infinite loop doing DHCP Discover. This situation can be reproduced no matter there is valid response from server-side.<br />
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Tested on CentOS 6.2 with For packages:<br />
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1. dhcp-4.1.1-25.P1_2.1(the default package comes with CentOS 6.2)<br />
2. dhcp-4.1.1-25.P1.el6_2.1(the newest package) can be obtained via `yum update`
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