- 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 not 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 Harder size ( more secure)
- No need for a DHCP (uses auto generated prefix from the router)
- Easier localhost address ::1 oppose to V4’s 127.0.0.1
- IPv6 has eight blocks of 16 bits for a total of 128 (called hextets)
IPV4 RFC 791, September 1981 http://tools.ietf.org/pdf/rfc791.pdf
IPV6 Original RFC 1884, December 1995 (Now obsolete) http://tools.ietf.org/pdf/rfc1884.pdf
Revised July 1998 RFC 2373 (Now obsolete) http://tools.ietf.org/pdf/rfc2373.pdf
Revised April 2003 RFC 3513 (Now obsolete) http://tools.ietf.org/pdf/rfc3513.pdf
Current RFC 4291, February 2006 RFC 4291 http://tools.ietf.org/pdf/rfc4291.pdf
V 4’s 4.2 billion address pales in comparison to what V6 offers.
V6 has 340,282,366,920,938,463,463,374,607,431,768,211,456 available numbers
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.
The above is meant as a reference, information is not static.