An extensive introduction to IPv6 concepts.

IPv6 has always baffled me on how it works. There are too many unfamiliar terms and mechanisms such that I never felt confident enough to start using IPv6. This article solves much of my confusion.

A clever idea. It uses an unsafe non-existent function to induce link-time error. Normally, if the call to this non-existence function is proven unreachable by the compiler, then the call to this function will be removed and won't catch any errors. Otherwise it raises a link-time error instead of runtime error.