GNOME RHV6 Error: "Could Not Lookup Internet Address <mylocalhostname>"

When I boot GNOME Red Hat V6.0, I get an error message: "Could Not Lookup Internet Address <mylocalhostname>, GNOME cannot work properly" where <localhostname> is the name I have assigned to my PC via the /etc/sysconfig/network file.

My PC does have a ethernet card in it, which is not being used at the moment.  I have setup ppp/chat so I can connect with my ISP, which works fine.

How do I resolve this GNOME error message? I think part of the problem lies with what is in my /etc/sysconfig/network file:

NETWORKING=no   * "No" - not using my ethernet card
HOSTNAME="??   * s/b = localhostname? match /etc/hosts?
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change your gateway device to ppp0

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JimIntrigliaAuthor Commented:
Thanks Biard for your response (that got me on the right track). Here is what my final /etc/sysconfig/network file looked like that resolved the problem with GNOME on boot:

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