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Description of problem: wlan0 can not be activated on RHEL5.7. # ifup wlan0 Determining IP information for wlan0...SIOCSIFFLAGS: No such file or directory SIOCSIFFLAGS: No such file or directory Version-Release number of selected component (if applicable): RHEL5.7-20110413.1 ThankPad T400 How reproducible: always Steps to Reproduce: 1. install RHEL5.7 on system with wireless NIC. 2. 3. Actual results: wlan0 activation fail Expected results: wlan0 is active Additional info: