Re: IPv4 Address Pool Has Been Expanded Significantly
Sounds like a stop-gap measure to me, and adding an awful lot of complexity into what was a very simple system for routing.
But I'll show you the death-knell:
"Many implementations of the TCP/IP protocol stack have the 240.0.0.0/4 address block marked as experimental, and prevent the host from forwarding IP packets with addresses drawn from this address block"
It will take you longer to find and remove such blocks over the world's legacy systems, in order for their "ordinary" IPv4 network to work as intended than it would to just deploy IPv6.
Hell, adding in use of a SINGLE BIT for ECN basically forced router upgrades world-wide, gave you an option in Linux to turn them off (still there I believe!) which many people used, and which stopped traffic routing to some pretty major destinations. Even when it was supposed to be an unused bit up until then.
Sorry, but it's dead. IPv6 is a specified requirement of DOCSIS, 4G+ technologies, in every major current operating system, accounts for 20% of Google queries and works. Nobody's saying it's perfect, but a far-too-late, far-too-complex system to extend IPv4 use and complicate the routing tables even more just sounds like a terrible solution at this juncture.
Biting the hand that feeds IT
