Why command "who am i" or 'last' command shows ip address intead of hostname of the logged in system?

Solution Verified - Updated -

Issue

  • who am i shows ip address, instead of hostname.
[root@rhel6u9-2 ~]# who am i 
root     pts/0        2017-08-15 09:36 (192.168.1.1) ↩↩↩↩↩↩
[root@rhel6u9-2 ~]# 

Environment

  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7

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