We have a site which includes paid banner and sidebar ads (not part of an advertising network). The ads are simple images/gifs which are linked to the advertiser's (external) site.
The links go through an internal redirect like:
What's the most appropriate way to apply a
nofollow on this type of link?
I'm concerned that search engines will see this as a
nofollow on internal links (when they're actually not).
One possible solution is to use
robots.txt to block
example.com/advert-redirect. Is this a suitable option?