[CentOS] resolv.conf rewritten every reboot. How to figure out who and why?

>Yes, I know the docs. What I was saying is - it will not help finding
>the cause, which is what the OP requested. It will just make the problem
>go away.

Uhm, am I missing something? It *is* the cause?
Its designed to do just what it's doing, and here's a real shocker, it's doing it:)