Take a peak into your /sbin to see if it's there. Or, run a locate ifconfig .
If it's there, then how are you getting to be root? Are you logging in or su-ing? If you su, then try su - . The "-" gives you root's path as well as permissions.
If it's not there, it should be in the net-tools RPM. Check if you have that with rpm -qa | grep net-tools .
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