Lets take 20 takes and they all have a links page with all their links linking to one another and all on 1 IP. Is this against any TOS for search engines?
If the sites are all quality sites and all related then the search engines probably won't have a problem with this. However, if the sites aren't related you'll run into trouble.
I personally avoid interlinking my own websites. This can be viewed as attempting to game the search engine algorithms or it could be viewed as a link farm. With seo it is best to play it safe for long term success.