IPv6

1
IPv6

• Keith Thompson

2
IPv4

• We currently use IPv4 as the widely adopted
  standard for an Internet Protocol.
• Ver. 4 has been around since late 70s
• Uses 32-bit addresses ie 128.193.736.445
• Used by P.C.s, Supercomputer systems, ATM
  systems.

3
Why a new protocol?

• Main reason Shortfalls in ver. 4s addressing
  scheme
• Version 4 supports 4,294,967,295 theoretical
  unique addresses.
• Some experts say that we are reaching the useable
  limit of the current 32-bit architecture.
• We need more addresses to supply growth in
  hardware market and new technologies

4
IPv6

• Uses 128-bit addresses
• Address delineated with semicolons
• eight four-digit hexadecimal integers ie
  1fff9f3eba26c08dbb5203aa92fab2af
• Not case sensitive
• 3X1038 theoretical addresses
• No more scarce addresses problem

5
IPv6 data overhead

• Low data overhead
• Critical for wireless devices (bandwidth)
• Use of optional header fields
• Less constrained to preset size and data contents
  allowing more packet features (authentication,
  encryption)
• Overall overhead size approx. doubled

6
IPv6 auto-configuration

• Auto-configuration made more robust, and simple
• Allows certain devices to get IP without the help
  of a server (like DHCP)
• Allows devices an always on connection (mobile
  devices, car internet)

7
IPv6 implementation

• Implementation presents problem
• Planned roll out of ver. 6 or smooth transition?
• Version 6 designed with backward compatibility
  with ver. 4
• This means to can co-exist indefinitely

8
IPv6 future

• Currently, IPv4 is still standard
• ISPs have been slow to adopt (profitability,
  demand) Spain has a few select IPv6 ISPs
• Some software is on market already
• Military uses IPv6 (DOD, Navy),
• Government mandates agencies by July, 2008.
• China, Europe have plans to implement soon

9
IPv6 future

• Changeover takes new routers, switches, OSs.
• Adoption has been slower than many thought
• Standard in next decade?