Both RedHat 6.0 and 6.1 hang when initializing the ethernet interface of intel 82559 based cards when connected to 100 Base TX ONLY. If connected to a 10BaseT, 10/100 switch, or disconnected, it will initialize OK. In any case it will still work at 100BaseTX once it is initialized.
Assigned to dledford
A shared IRQ bug was fixed for 6.2. Reopen the bug if 6.2 still does this