Fedora Networking :: Dhclient Cannot Find Interfaces

I am running Fedora 13 and after my machine is booted my ethernet interface eth0 does not have an IP address. Running

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At the terminal does not work, and I can see that in /var/log/messages I have the following error:

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I assume that the same command was attempted during the boot process (please correct me if I am wrong) to use DHCP to get an address for eth0, but failed for the same reason it is failing after boot when I run it manually, whatever that reason may be.

I noted, however, that eth0 IS in broadcast mode:

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I also noted that running

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Does in fact work and will run DHCP and configure eth0 with an ip address.

It is quite mysterious to me why running 'dhclient eth0' will work, but manually running 'dhclient' does not.