IPv6

Key Aspects Increased address space SLAAC Security Simplified router processing

Address Space IPv4 – 32 bit space – Billion+ IPv6 – 128 bit space – – 340,282,366,920,938,463,463,374,607,431,768,211,456 – This is approximately 665,570,793,348,866,943,898,599 addresses per square meter of the surface of the planet Earth (assuming the earth surface is 511,263,971,197,990 square meters). – If addresses are assigned at the rate of one million address every microsecond, it would take over 20 years to assign all possible address. – Standard size of subnet – 2 64 (square of entire IPv4 network)

Addressing Eight groups of four hex digits 2001:0db8:85a3:0000:0000:8a2e:0370:7334 One or more leading zeros from any groups can be removed Consecutive sections of zeroes are replaced with a double colon (::)

Addressing (cont) Initial address: 2001:0db8:0000:0000:0000:ff00:0042:8329 After removing all leading zeroes: 2001:db8:0:0:0:ff00:42:8329 After omitting consecutive sections of zeroes: 2001:db8::ff00:42:8329

SLAAC Stateless address autoconfiguration Uses Neighborhood Discovery Protocol “Stateless DHCP”

Security Internet Security Protocol (IPsec) developed for IPv6 found its way into IPv4 Was mandatory – now optional

Simplified Router Processing Simplified header Routers don’t do fragmentation – Hosts responsible Perform path MTU discovery Default MTU of 1280 octets Hop count instead of TTL

IPv6 Packet Header - 40 octets Payload – 64 KB without options – 4GB as Jumbo Payload