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    This discussion has been archived. No new comments can be posted.
    Telecordia Responds to (Some) Critics | Log in/Create an Account | Top | 20 comments | Search Discussion
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    Remember Root Anycast ? Now Watch The Cover-Up
    by Anonymous on Thursday May 05 2005, @05:26AM (#15106)
    david.conrad@nominum.com (David Conrad) writes:

    > In my experience, shared unicast DNS provides quite a few benefits,
    > particularly in the context of ISPs or services that need to be highly
    > available, at the cost of some additional routing configuration
    > complexity. There are, of course, situations in which the costs of
    > shared unicast DNS outweigh the benefits, but I've found those situations
    > to be rare in larger networks.

    i figure this is as good a time to mention this as any. david conrad was
    the first voice for wide scale ipv4 anycast of root name servers, and when
    f-root started deploying this (in the months before the october 2002 ddos)
    it was because david and i had been sharing an office and talking about it.
    ("and it makes for great security/resiliency slideware.")

    for the record, i remain convinced that unowned anycast (where the prefix
    being advertised isn't solely controlled by a single entity worldwide) is
    dangerous and should not be done except in cases like AS112 (www.as112.net).
    ("but it makes for great socialist-internet slideware.")

    while i'm on the subject, i also remain convinced that using anycast to do
    distributed load balancing for applications like WWW, on the assumption
    that the path you heard a dns query on is instructive as to what content
    would be best to answer with, is silly, and will more often do harm or do
    nothing than do good. (and i've told akamai and speedera this many times.)
    ("but it makes for great marketing slideware.")

    lest anyone be confused, ultradns's anycast for .ORG is completely coherent
    and doesn't admit the possibility of giving out different responses from
    different anycast nodes for policy reasons or any other reason, and so it's
    an example of "good" anycast the way i count such things.

    finally, a word about tcp. even the most pessimistic route-change
    measurements (from verisign and IIJ) wouldn't affect tcp performance for
    transactions as short-lived as occur with dns queries. but that's not a
    justification for switching to tcp. if we believe that EDNS0's buffer
    size management isn't good enough, then we can bring back the MD bit from
    an old EDNS1 proposal. but we won't be holding full tcp session state in
    dns servers. nope nope nope.
    --
    Paul Vixie
    [ Reply to This | Parent ]
    Re:On the .BIND and .SERVER Top Level Domains
    by Anonymous on Thursday May 05 2005, @05:50AM (#15107)
    For the DNS-Challenged:

    "My intent in writing the original draft was to document existing practice and behavior (a txt query in the chaos class for {version,hostname}.bind) and suggest an alternative with minimal changes that would be less offensive to other vendors (a txt query in the chaos class for {version,id}.server)."

    Note: The approach is for the ICANN, ARIN and Root Operator insiders to add whatever TLDs they want and then documwent them as "existing practice and behavior".

    Cisco of course added the .LAN TLD to their products.

    [ Reply to This | Parent ]


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