Interesting times we live in. IPv4+ (better name) and Enhanced IP (possibly better protocol) both use IP options. I won't recap what IPv4+ does but here's a r

Interesting times we live in. IPv4+ (better name) and Enhanced IP (possibly better protocol) both use IP options. I won't recap what IPv4+ does but here's a recap on the important bits of EnhancedIP. There is a proof of concept implementation available for Linux at www.enhancedip.org. You can download VMs to see how it works. Also, http://www.enhancedip.org/learnmore.html http://www.enhancedip.org/learnmore.html has a quick rundown with just enough detail to get the idea. EnhancedIP uses a 64-bit address that works as two IP addresses concatenated together. Enhanced IP requires NATs and end hosts to be upgraded but not core/edge routers. Enhanced IP is also backwards compatible with IPv4 as much as is possible. There is a draft RFC and a full paper available for Enhanced IP. Because the Internet wouldn't have to wait on a core router upgrade to get started, this might move along more quickly.