Do take note of TBone's remark "You can't upgrade from 5.1 to 6.7. ".
RHEL does not support in-place upgrades cross major versions (at least up till v6).
You are best to put the 6.7 (should really be 6.8) on a new box and gradually make it work like the old 5.1 box.
That way you don't lose the current system.
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