If the permissions on /bin/ping were incorrect, it may mean that your system has been cracked. You probably should check by running ``rpm -V iputils'' which will show changes in any files in the package.
Thanks Bill for your concern and tips, but it is me who accidentally change the file permission when I run chown command with the wrong parameter. Tsk tsk, I guess I am lucky that the machine are just my test machine for evaluating systems.
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