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Archive for June 26th, 2009

IPV6 address’

Posted by Peter Kurdziel on June 26, 2009

http://www.potaroo.net/ispcol/2008-08/ipv6addr.html

::1/128 local host
::FFFF:w.x.y.z IPv4 mapped address – lookup IPv4 address w.x.y.z
FD00::/8 Unique Local Addresses.

    No registry is used for these addresses
FE80::/10 Link Local Addresses

    No registry is used for these addresses
2001:0::/32 Teredo address

    • a Cone NAT flag (C),
    • the Universal (U) flag (set to 0),
    • the Individual/Group (G) flag (set to 0),
    • a reserved flag (R),
    • a 12 bit random value (A) used to deflect intrusion attacks.
      2001:0:cf2e:308c:0:323d:3fa1:c0b0
      Teredo server IPv4 address is cf.2e.30.8c = 207.46.48.140
      External Obscured Port of client is 323d = port 52674
      External Obscured IP address of client is 3f.a1.c0.cb = 192.94.63.70
  • Bits 33 – 64 of the address contain the Teredo server address

    Bits 65 – 80 contain flags: The field format is: CRAA AAUG AAAA AAAA

    Bits 81 – 96 contain the external IPv4 port address, XORed with 1′s

    Bits 97 – 128 contain the external IPv4 address XORed with 1′s

    For example, the Teredo IPv6 address : can be mapped as follows:

2002::/16 6to4 address

    • 2002:cb0a:3cdd:1::1
      cb.0a.3c.dd = 203.10.60.221
  • Bits 17 – 48 contain the IPv4 address of the 6to4 gateway

    For example, the 6to4 address has the IPv4 gateway address of

Posted in IPV6, Routing & Switching Lab | Leave a Comment »

 
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