While I was checking around I noticed I was getting hits for threads and forums with index.php added at the end of the friendly URLs urls such as:
Where as following the links via the forums the end URL is:
Where are these links being generated?
This looks like it also happens here at xenforo.com so I know its not just my site as I do have extra rules in my .htaccess to 301 old content from vB:
You can even manipulate the .php and the URL is resolved:
Is this classed as duplicate content? If so what would be the most appropriate way to fix this?