IP version 6, a 10,000 foot View
- Has full-time IPSEC
- Eliminates the need for broadcast.
- Uses UNICAST (one to one)
- Uses MULTICAST FF01: (one to many)
- Uses ANYCAST (one to closest)
- Eliminates the need for HSRP/VRRP
- NAT is no longer used
- No more private addresses (the old v6 unique site-local address is eliminated)
- Uses Global scope address 2000::/3 (internet2 address 2001::/16)
- Uses Link Local FE80: layer 2 auto generated Think 169.254.0.0
- (MAC – FFFE – MAC) = last 64 bits (48 bit MAC Address + 16 bit FFEE IPV6 )
- Smaller Header size ( more secure)
- No need for a DHCP (uses auto-generated prefix from the router)
- Easier localhost address::1 as oppose to V4’s 127.0.0.1
- IPv6 has eight blocks of 16 bits for a total of 128 (called hextets)
V4 has 4.2 billion address, which pales in comparison to what V6 offers.
V6 has 340,282,366,920,938,463,463,374,607,431,768,211,456 available numbers. The number is written out below, for your enjoyment.
Three hundred and forty undecillion, two hundred and eighty-two decillion, three hundred and sixty-six nonillion, nine hundred and twenty octillion, nine hundred and thirty-eight septillion, four hundred and sixty-three sextillion, four hundred and sixty-three quintillion, three hundred and seventy-four quadrillion, six hundred and seven trillion, four hundred and thirty-one billion, seven hundred and sixty-eight million, two hundred and eleven thousand, four hundred and fifty-six.
http://www.thefreedictionary.com/undecillion < hear the pronunciation here.
Sources
http://www.urbandictionary.com/define.php?term=Hextet&defid=5546783
http://networkingtrix.com/wiki/Hextet
- IPV4 RFC 791, September 1981 https://www.rfc-editor.org/pdfrfc/rfc791.txt.pdf
- IPV4 RFC 1918 February 1996 Address Allocation for Private Internets https://www.rfc-editor.org/pdfrfc/rfc1918.txt.pdf
- IPV6 Original RFC 1884, December 1995 (Now obsolete) https://www.rfc-editor.org/pdfrfc/rfc1884.txt.pdf
- Revised July 1998 RFC 2373 (Now obsolete) https://www.rfc-editor.org/pdfrfc/rfc2373.txt.pdf
- Revised April 2003 RFC 3513 (Now obsolete) https://www.rfc-editor.org/pdfrfc/rfc3513.txt.pdf
- Current RFC 4291, February 2006 RFC 4291 https://www.rfc-editor.org/pdfrfc/rfc4291.txt.pdf
Posted from: http://itknowledgeexchange.techtarget.com/whatis/ipv6-addresses-how-many-is-that-in-numbers/
The above is meant as a reference, information is not static.
George S. Davis
Sr. Network Engineer
George has worked in data, voice, and electronic technologies for over twenty-five years.
From small and mid-size offices to large enterprise fortune 500 companies. He is experienced in legacy voice communications, electronics, VOiP, and DATA networking.
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