DNS question and Google PageRank from domains

Question

I'm not so good at DNS at all but I do know some basics.

A while ago i have noticed, that my blog have different Page Ranks, PR 3 for domain www.example.com and PR 1 for domain example.com.

In dns records i have this setup:

A - IP - `www.example.com`
A - same IP - `example.com`

Should i replace this record "A - same IP - example.com" with row with CNAME instead of A? Like that:

CNAME - same IP - `example.com` - alias `www.example.com`

Will this combine Page Rank value of both domains?

Or i can just create 302 redirection inside .htaccess file, verify example.com(without www) inside Google Webmaster Tools as my domain and inside www.example.com options set as main domain?

Thanks ;)

Answer 1

You need to set a 301 redirect on one of your domains to point to the other one.

Answer 2

If the only difference is "with or without .www" you can use Google Webmaster Tools to warn Google that both are the same website.

Or, you can use a permanent redirect to move traffic to the preferred form of the website name.

Or, if you don't want to use a single URL, but you want to warn search engines of the uniqueness of the content, you can use canonical URLs.