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IPv4 to IPv6 what happened to 5 ?





akshar
IPv4 is 32 bits address and IPv6 is 128bit address sufficient to address each single molecule on the surface of the earth.

But what happened to IPv1 .. 2..3..and IPv5?

As far as I know none of them existed but why?

Is it that IPv4 was drafted in 1984?
redice
Do you hear about windows 99, windos 2001, windows 2002, windows 2006?
The version number is not strict number indexed. It is not always inreament by 1, or start from 1.
Traveller
According to Wikipedia, IPv5 was not related, but was something experimental for audio and video:

http://encyclopedia.thefreedictionary.com/IPv6
http://encyclopedia.thefreedictionary.com/IPv5
WickedGravity
It is a instance where the version was not sufficiently ready, modified or upgraded to be released.

Have you ever played a video game where it went from 1.0 to 1.5? It is because when they make small revisions, they may not feel it suitable to release to the public at large.

So keep in mind that what is in IPv6 contains whatever changes were in IPv6, but with the newer enhancements of IPv6.
akshar
Your replies were very helpful but do check the following link to find out more about this issue

iana.org
badai
here the list of all version. amuse yourself.

http://www.iana.org/assignments/version-numbers
Stubru Freak
I have heard that the version number is related to the number of parts.
IPv4: 4 parts 0-255
IPv6: 6 parts 0-255 (but in hexadecimal notation)

Of course this may be just a myth.

Where did you find that every molecule on earth can be indexed? I have trouble believing this.
badai
not true.

v0 is reserved.
v1-3 don't exist
v5 is different protocol altogether, run on top of ver4. so it is 4 parts each 0-255.
v6 got 8 parts. each part 0-65535
v7 got 4 parts. each part 0-65535
v8 i'm not sure how many parts, but altogether is 64bits
v9 will use either v4 or v6 using CLNP, so it can be 4 parts each 0-255 or 8 parts each 0-65535
v10-14 don't exist
v15 is like v0, reserved.

what does reserved mean? i'm not sure. maybe like our IP where the first address reserved for null and the last reserved for broadcast.

Stubru Freak wrote:
I have heard that the version number is related to the number of parts.
IPv4: 4 parts 0-255
IPv6: 6 parts 0-255 (but in hexadecimal notation)

Of course this may be just a myth.

Where did you find that every molecule on earth can be indexed? I have trouble believing this.
Cole
Well remember that those pieces of data have to be read they are an identification number.

Why 0 and 15 were set aside, I have no idea. My guess is they could mean something like. Maybe 0 means extended header and 15 means even-more-extended header allowing for more than 4bits(16 possibilites).
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