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    This discussion has been archived. No new comments can be posted.
    VeriSign Domain Report Shows Criticality of .net | Log in/Create an Account | Top | 12 comments | Search Discussion
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    Re:AAAA DNS Records Carry TEXT Strings for .NET
    by Anonymous on Saturday September 18 2004, @07:38AM (#14162)
    Check out the new .MAN TLD

    Another issue is the aspect of mobility, which is different from what
          has traditionally been termed "IP mobility". The concept in IP
          Mobility is that a device has a normal home in some topological part
          of a stable network, as indicated by its address, but may temporarily
          move somewhere else. That "address" then becomes something more like
          a name. A home agent translates it into a second address, which
          represents the device's current actual topological location, and the
          packet stream is forwarded there. The device may then advise its
          correspondent of its current topological "care-of" address,
          facilitating more direct routing. In a MANET, the address is tied to
          the device, not a topological location, as there is no fixed network
          infrastructure. When the addressed device moves, therefore, the
          motion changes the routing infrastructure. There is no question of
          the correspondent transmitting to the new care-of address, or of a
          home agent forwarding traffic from "the right place" to "somewhere
          else" along a dog-leg path; standard routing will get the packets
          there as a direct outcome as routing tracks the motion of the device.

          Mobility is not an aspect of all MANETs; some varieties of sensor
          networks (such as forest fire sensors scattered by airdrop in the
          region of a fire) can be expected to be stationary once deployed.
          However, even in this case, topological relationships are arbitrary
          and unengineered. In applications where node mobility is in view, it
          can be haphazard, and in extreme cases can result in entire networks
          randomly partitioning and joining together.

          The fundamental behavior of a manet is that a routing node carries
          with it an address or address prefix, and when it moves, it moves the
          actual address. When this happens, routing must be recalculated in
          accordance with the new topology.
    [ Reply to This | Parent ]
    Re:AAAA DNS Records Carry TEXT Strings for .NET
    by Anonymous on Saturday September 18 2004, @11:19AM (#14169)
    Note: DNS AAAA Records Contain 128 Bits. With a 5-bit Alphabet, 32 Characters (Symbols) can be supported. Each 128-bit AAAA Record can contain up to 25 Characters with 3 bits for Record Type. The 32 Characters can be ® A to Z dash under-score @ © and of course DOT (.). Using the right-most 2 bits of the TTL field on legacy 32-bit A Records, a 128-bit AAAA Record can be constructed from one to four A Records.

    It may be hard to get Milton's ego into 25 characters.

    [ Reply to This | Parent ]
    Re:AAAA DNS Records Carry TEXT Strings for .NET
    by Anonymous on Monday September 20 2004, @06:51PM (#14183)
    Not all AAAA records will contain IPv6 addresses.
    The A6 DNS record type is designed for IPv6.

    IPv6 support for com/net zones on October 19, 2004

            * From: Matt Larson
            * Date: Mon Sep 20 17:09:58 2004

    VeriSign will add support for accessing the com/net zones using IPv6
    transport on October 19, 2004. On that day, AAAA records for
    a.gtld-servers.net and b.gtld-servers.net will be added to the root
    and gtld-servers.net zones.

    We do not anticipate any problems resulting from this change, but
    because these zones are widely used and closely watched, we want to
    let the Internet community know about the changes in advance.

    Matt Larson
    VeriSign Naming and Directory Services

    [ Reply to This | Parent ]

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