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IPv6 The Next Generation. Presented by Anna La Mura Jens Waldecker. Content - Overview. Situation IPv6 challenges IPv4 Header Comparison IPv4 - IPv6 Operation modes Unicast / Multicast / Anycast Addresses Notation Prefixes Autoconfiguration Compatibility / Tunneling.

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ipv6 the next generation

IPv6 The Next Generation

Presented by

Anna La Mura

Jens Waldecker

content overview
Content - Overview
  • Situation
    • IPv6 challenges IPv4
  • Header
    • Comparison IPv4 - IPv6
  • Operation modes
    • Unicast / Multicast / Anycast
  • Addresses
    • Notation
    • Prefixes
    • Autoconfiguration
    • Compatibility / Tunneling
ipv4 what s wrong
IPv4 – What’s wrong?
  • Insufficient address space
  • Subnetting and CIDR don't solve this problem in the long term
  • Router tables are getting too big
    • slowing down the connection speed
    • wastes bandwidth
  • But: traffic grows every day!
ipv6 intention
IPv6 – Intention
  • 128 bit address space Þ 3.4 x 1038 IP’s
  • Can replace NAT with native P2P
    • Except NAT used for security reasons
  • Optimized for Stacking
  • Simplified header structure
ipv6 operation modes
IPv6 – Operation modes
  • Unicast
    • Single sender to single receiver
    • Global unique address
    • Peer to Peer connection
  • Multicast
    • Single sender to multiple receivers
ipv6 operation modes1
IPv6 – Operation modes
  • Anycast
    • Single sender to receiver group
    • IPv6 routes the message to the nearest of several possible gateway hosts
      • There packets are seen as if they were unicast.
      • Any one of them can manage the forwarding
    • Designed to let one host initiate the efficient updating of routing tables along the line.
ipv6 addressing
IPv6 – Addressing
  • Notation
  • Prefix
  • Subnetting
  • Address auto configuration
  • Multiaddressing
ipv6 notation
IPv6 – Notation
  • Hexadecimal
  • 8 4-tuple with 2 bytes each, divided by „:“
    • Groups of 0‘s can be written as :: (one time)
    • Leading 0‘s can be dropped
  • Examples:
    • 5F15:A1CD:1E34:5378:9AFC:18A4:5F78:8907
    • 3FFE:645:879::371
ipv6 addresses
IPv6 – Addresses

FP = format prefix

TLA ID = top level aggregator

RES = reserved

NLA ID = next level aggregator

SLA ID = side level aggregator

ipv6 prefixes
IPv6 – Prefixes
  • Prefix length
    • „Value specifying the leftmost contiguous bits of the address comprise the prefix”
    • Compare with Subnetting in IPv4
  • Example: prefix 12AB00000000CD3
    • 12AB:0000:0000:CD30:0000:0000:0000:0000/60
ipv6 prefixes1
IPv6 – Prefixes
  • Do these addresses match prefix 12AB00000000CD3 ?? Why?
    • 12AB:0:0:CD3/60
    • 12AB::CD30:0:0:0:0/60
    • 12AB:0:0:CD30::/60
    • 12AB::CD30/60
ipv6 prefixes defined
IPv6 – Prefixes defined
  • Unspecified ::/128
  • Loop back ::1/128
  • Multicast FF00::/8
  • Link-local unicast FE80::/10
  • Site-local unicast FEC0::/10
  • Global unicast Rest

(Local addresses are not routed)

ipv6 auto configuration
IPv6 – Auto configuration
  • Privacy Extensions for Stateless Address Auto configuration (RFC 3041)
  • Interface ID to identify an Interface to one link. (64 bit)
    • MAC Address:
      • 00-00-39-63-D0-F7
    • Interface ID:
      • FE80::200:39FF:FE63:D0F7
ipv6 ipv4 compatibility
IPv6 – IPv4 Compatibility
  • IPv4 compatible addresses:
    • ::80.140.24.23
      • Used for native IPv6 nodes
  • IPv4 mapped addresses:
    • ::FFFF:80.140.24.23
      • Used for IPv4 nodes only
      • Don‘t appear on a connection
ipv6 tunneling
IPv6 – Tunneling
  • Virtual Link between two IPv6 hosts via IPv4
  • IPv6 Packet encapsulated in IPv4 Packets as Payload information
  • Nodes don‘t have to understand IPv6
  • Reverse resolution supported
ipv6 end of presentation
IPv6 – End Of Presentation
  • [x] Any questions? Feel free to ask!
  • [x] Thanks for your Attention!
  • [x] Pause