Hi Sagar,
By installing CW floating license you mean the "License Manager installer" ?
License Manager Installers|Freescale
What is the OS used ?
It's the first time I heard something regarding external IP address.
The IP is defined by the LMtools.
On my side it's:

When I generate the license file I need to use the Hostname or IP Address as server name.
For instance I could have a floating license as:
SERVER R6AAKE-12 DISK_SERIAL_NUM=daae9c76 27001
or SERVER 10.213.33.166 DISK_SERIAL_NUM=daae9c76 27001
Why are you looking for an external IP Address ?
Have a great day,
Pascal
Freescale Technical Support
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