my addon domain as duplicate domain by google

I have a domain name sujangarh.net
i created a subdomain
rundir.sujangarh.net
then added a addon domain to this
rundir.com

now google see them as a different domain names and i think google think that duplicate domain because both are same
What to do
please help me

 

I think you should use 301 redirect

 

Yup,

Put a 301 redirect on the subdomain to point to the new rundir.com domain.

Keep a close eye on it. After a few weeks you should see your subdomain replaced with the new domain in the search index

Hope this helps

 

Is there any way using robots.txt

 

Robots.txt can only block crawling of some site, while 301 redirects will permanently redirect old links to the new one.

 

I m getting problem in rediret.
I have cPanel.