Hi Shailesh,
You are getting these errors because you are using moodle installation as a directory. The best bet would be to make the changes in the DNS and setup a name instaed of the ip address.
What you need to do is:
1. Create a domain name for your site and set that name as $CFG->wwwroot in the config.php file
2. Internally direct that domain name to your internal ip address
3. Externally direct that domain to your external ip address
and on the webserver, set the directory root to http://ip-address/moodle and not http://ip-address.
Let me know how you go.
Thanks
Sandeep