"Do not use recursion for this domain"?

Discussion in 'DNS Server' started by Spin, Apr 15, 2004.

  1. Spin

    Spin Guest

    "Do not use recursion for this domain"?

    What does this checkbox mean in the Forwarders tab of a DNS server
    properties? It doesn't make any sense. In what case would you *not* want a
    DNS server to perform recursion for a specific domain?
     
    Spin, Apr 15, 2004
    #1
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  2. In
    Check that box means that it will only use the forwarder listed and will not
    attempt to resolve names from the root hint servers.

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    Kevin D. Goodknecht [MVP], Apr 15, 2004
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  3. S> "Do not use recursion for this domain"?
    S>
    S> What does this checkbox mean in the Forwarders tab
    S> of a DNS server properties? It doesn't make any sense.

    It's egregiously mis-named. This is a long-standing wart in Microsoft's DNS
    server that catches novices out reasonably often. A far better name would be
    "use only forwarding".

    This is because even when this option is enabled, the server _does_ use
    recursion. (Recursion is where a DNS server sends back-end queries of its own
    to other DNS servers, in order to obtain the answers to questions that its own
    front-end has received.) Forwarding is recursion. This option doesn't
    control the use of recursion. It controls the use of _just one type of_
    recursion. There are, of course, two types of recursion: forwarding (to other
    proxy DNS servers) and (what Microsoft terms) "standard recursion" (to content
    DNS servers). This option controls whether the latter form of recursion is
    used whenever the former form of recursion fails (or is not configured).
     
    Jonathan de Boyne Pollard, Apr 16, 2004
    #3
  4. Spin

    Roger Abell Guest

    In an earlier terminology, this makes the DNS server into a
    slave of its forwarders for all data outside of its authority.
     
    Roger Abell, Apr 17, 2004
    #4
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