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Since we are all moving towards IPv6 whether we want it or not, I ask this: what happened to IPv5? Was it not cool enough for it's older brother, or did something else happen to that specification?
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IPv5 was never accepted as an official internet protocol. This was mainly due to the 32-bit limitation. IPV5 used the same addressing system as IPv4. Each address was made up of four sets of numbers between 0 and 255.
Here's the kicker – IPv5 never actually existed. Although there is an IP version with 5 assigned as its number, only two versions of the protocol are actually recognized by their numbers: IPv4 and IPv6. In fact, what we refer to as IPv5 is officially known as the Internet Stream Protocol (ST).
IPv6 Enters the Picture In the early 1990s, first generation Internet engineers determined that the use of classful IPv4 addressing and the expected growth of the Internet were going to cause scalability problems that would potentially inhibit its further expansion.
Network address translation (NAT) and IPv6Adoption of IPv6 has been delayed in part due to network address translation (NAT), which takes private IP addresses and turns them into public IP addresses.
I believe the answer lies in the "What ever happened to IPv5?" blog post over on http://www.oreillynet.com
To quote:
In the late 1970’s, a protocol named ST — The Internet Stream Protocol — was created for the experimental transmission of voice, video, and distributed simulation. Two decades later, this protocol was revised to become ST2 and started to get implemented into commercial projects by groups like IBM, NeXT, Apple, and Sun. Wow did it differ a lot. ST and ST+ offered connections, instead of its connection-less IPv4 counterpart. It also guaranteed QoS. ST and ST+, were already given that magical “5″.
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