google indexing many pages incorrectly

i'm having a problem with the indexing process
i have some addon domains that are having pages indexed twice
once : [nourl]www.addon.com/page1.html[/nourl] (or php)
the second as: ip /~username/addonfile(name of addondomain)/page1.html (or php)
the problem is that they consider them duplicate content
and that the second do not show exactly all the layout it should

any solution ?

 

make sure each unique content page has ONE single URL only
or
exclude the other half of pages with dupplicate content by robots.txt

 

There is a better easier solution if you are an Apache user. Create a .htaccess file, like this :

Options +FollowSymlinks
RewriteEngine on
RewriteRule ^\~username\/(.*)   http://www.addon.com/$1  [QSA,L,R=301]

Code (markup):

Jean-Luc