Friday, June 22, 2012

IPv1 , v2, and v3

I always hear "What happened to IP version 5?" But we've seen the answer many times.  "Some experimental testing version".

While reading Charles Kozierok's excellent TCP/IP Guide, I found the history of why IPv4 was actually the first version of IP as in a Layer 3 on it's own.  The addressing layer was part of the original Network Control Program and then Transmission Control Program combined into a single Layer3 and 4 functionality.   TCP became Transmission Control Protocol by its 'fourth iteration'.

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