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IPv6 Addressing Details. LAC NIC VII October 26, 2004 Wilfried Woeber woeber@cc.univie.ac.at. topics. Header (format, extension header) Addresstypes Configuration Scope, lifetime. Header. fixed-length 40 byte header checksum removed no options in base header

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ipv6 addressing details

IPv6 Addressing Details

LACNICVII

October 26, 2004

Wilfried Woeber woeber@cc.univie.ac.at

topics
topics
  • Header (format, extension header)
  • Addresstypes
  • Configuration
  • Scope, lifetime
header
Header
  • fixed-length 40 byte header
  • checksum removed
  • no options in base header
  • new flow label field (use is currently not defined)
  • faster packet processing (with hardware support)
  • options in flexible and extensible extension headers (can be transparent for transit nodes)
extension headers
Extension Headers
  • hop-by-hop (various, e.g. discard packet w/o ICMP)
  • routing (address list  source routing)
  • fragment (fragmentation only done by source)
  • destination options (various , e.g. discard packet w/o ICMP)
  • authentication (integrity and data origin auth.)
  • encapsulating security payload (confidentiality)
addresstypes
Addresstypes
  • unicast (identifier for single interface, packet is sent to interface identified by that address)
  • anycast (identifier for a set of interfaces, packet is sent to one of the interfaces identified by that address (the \'nearest\' one))
  • multicast (identifier for a set of interfaces, packet is sent to all interfaces identified by that address)
ext representation format
Ext. Representation / Format
  • x:x:x:x:x:x:x:x  x is 16bit hex-value
  • leading zeros are not necessary &series of zeros can be compressed2058:0000:0000:000b:0800:ac23:0001 = 2058::b:800:ac23:1
  • prefix length is written in CIDR notation3ffe:8034:80:1:2a0:24ff:fe9d:5094/64
unicast addresses
Unicast Addresses
  • unspecified (::/128) [ no IPv4 equivalent ]
  • loopback (::1/128) [similar to 127.0.0.1 in IPv4]
  • link-local (prefix fe80::/10 + interface identifier)
  • site local (prefix fec0::/10 + interface identifier) [killed]
  • global (e.g. prefix 2001:600::/23 for RIPE region)
  • IPv4-compatible address (::131.130.1.201)
  • IPv4-mapped address (::ffff: 131.130.1.201)
  • IPv6 addr. cont. encoded OSI NSAP addr.
interface identifier
Interface Identifier
  • used to identify interfaces on a link
    • has to be unique on that link
  • 64 bits long, modified EUI-64 format
    • created from -) IEEE EUI-64 identifier -) IEEE 802 48 bit MAC -) any other link identifier -) manually chosen identifier
  • uniqueness can be independent of address
  • ==> or picked at random to protect privacy!
anycast addresses
Anycast Addresses
  • allocated from the unicast address space nodes must be explicitly configured
  • host-routes are needed !!!  most likely NO global anycast sets
  • status: no anycast for hosts, only for routers: subnet-router anycast address same as unicast address, but interface identifier set to zero
multicast addresses
Multicast Addresses
  • ff00::/8
  • flags: 3 high-order reserved, permanently/ non-permanently
  • scope: various scopes (e.g. link-local, org-local, global)
  • group id: identifies multicast-group
  • some multicast addresses are reservede.g.: all nodes addr (ff0x::1) all routers addr (ff0x::2) solicited-node address
  • routers must not forward any multicast packet beyond the scope indicated by the scope field
lifetime scope
Lifetime / Scope

lifetime

  • valid preferred
  • valid deprecated - not to be used to initiate new communication
  • invalid - must not be used (neither source nor destination)

scope

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