Ipv6 addressing details
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IPv6 Addressing Details. LAC NIC VII October 26, 2004 Wilfried [email protected] 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 [email protected]


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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