Why are only IP V4 and V6 accepted?

Question

ok, I know, this time I will be banned with ip-ban: D my question is rather strange: why only V4, and then jumped to V6, accepted! why, listening to the history of the Internet, we do not find IP V3 or IP V2 ?! why are they dident Just adopt IP V5, it was logically not?

because personnaly (I'm dumb), I thought 4 and 6 is the number of bytes used ...

Answer 1

The gap in the sequence of versions between IPv4 and IPv6 was due to the assignment of number 5 to the experimental Internet Stream Protocol in 1979, which was never referred to as IPv5

http://en.wikipedia.org/wiki/IP_address#IP_versions

IPv1, 2 3 TCP/IP, 3 . IPv4: 2 IP-.

http://itknowledgeexchange.techtarget.com/itanswers/what-happened-to-ipv1-ipv2-ipv3-and-ipv5/

Answer 2

IP- 1, 2, 3

Charles M. Kozierok, tcpipguide.com, , IP - 4 ( 1):

[Jon] Postel TCP/IP TCP TCP IP ; , "TCP/IP". (...) TCP 3 TCP, 1978 . IP TCP, ( 4) 1980 . "" IP - 4, 1. (...)

IPv4 Jon Postel RFC760, RFC777 ( ICMP) RFC791.

RFC777 RFC791 , , RFCs. RFC . RFC760 , .

---

IP 5

5 IP , - . - (ST ST2) 1979 IEN119 RFC1190 RFC1819.

RFC1190 (ST)

64:

5, , ST , TCP UDP, . 5 ST IP 5 ST [18 ]

75:

IP 4, ST 5 [18]. IP ST .

RFC1819 (ST2)

8:

ST2 IP . ST2 IP- , : 5 ST2 ( IP 4). , IP, ST2 . ARP Layer 2 SAP IP.

ST2 IP-. (...)

77:

IP ST- IP-, .. (4) ; ST 5 (. [RFC1700]). IP ST . (IP 4.)

Answer 3

I think the main problem is hardware acceleration. Large warehouses and Internet controllers have v4 / v6 hardware accelerators. They do not want to replace this material more than once every 20 years. It is too expensive to do it anymore.