Re: A different solution
The odd numbered versions for IP standards are the experimental or working drafts. So IPv4 was preceeded by someone playing around in a standard called IPv3, IPv6 had IPv5 before it and IPv7 was being kicked about years ago as far as I know. I think this might be true for everything the standards body that deals with IPvX churns out. The experimental odd versions are never designed for real world release but as test platforms to evaluate ideas.