Interesting times we live in.  IPv4+ (better name) and Enhanced IP (possibly better protocol) both use IP options.  I won&#x27;t recap what IPv4+ does but here&#x27;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, <a href="http:&#x2F;&#x2F;www.enhancedip.org&#x2F;learnmore.html" rel="nofollow">http:&#x2F;&#x2F;www.enhancedip.org&#x2F;learnmore.html</a> 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&#x2F;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&#x27;t have to wait on a core router upgrade to get started, this might move along more quickly.