Restricting access to a single MultiSite site based on IP — possible?

Question

I have need to restrict not just admin access but also access to the content stored on a single site in a MultiSite network based upon a user's IP address.

1. Is this even possible?
2. Is there an easily admin-able plugin?

(I could restrict access using something like Justin Tadlock's "Members" plugin, but the requirement in this case is based on IP.)

Answer 1

Don't know about more extensive solutions but this can be accomplished with tiny plugin which will check IP (in $_SERVER) at some stage of load and die on match.

Had you looked through official repository? There is IP tag.