Re: DNS Recursive Query
From: Herb Martin (news_at_LearnQuick.com)
Date: 05/05/04
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Date: Wed, 5 May 2004 12:58:50 -0500
"Roland Hall" <nobody@nowhere> wrote in message
news:OQmLw0mMEHA.3556@TK2MSFTNGP09.phx.gbl...
> "Matt" wrote in message news:85d101c43248$5af2c430$a501280a@phx.gbl...
> : Can someone explaine (or tell me where there is info on)
> : DNS Reversive Query. I have 2 DNS servers, DNS1 will
> : always pass tests, DNS2 will always pass simple query, but
> : fail recursive squrey. Both are configured exactly the
> : same.
>
> DNS2 is not a secondary to DNS1?
Fairly irrelevant to "recursive queries" but it does point out that
it is UNLIKELY the two servers are exactly the same.
Recursive queries are those that must be answered by a DNS
server going to OTHER DNS servers to answer the request.
Such queries can be answer by forwarding to another DNS
server, or by performing the actual recursion from the ROOT
down of the namespace.
In the latter (general) case, the server much have the correct
"root servers" configured (in Root Hints or Cache file) and be
able to reach them through any intevening firewalls.
One example problem would be a firewall that blocked the
internal server from reaching "The Internet" and yet it was
configured with root hints to recurse from the Internet Root
servers.
(In such cases, forwarding usually works better. )
Another example might be a machine which SHOULD be
using an Internal Root or External (Internet) root configured
with the opposite.
-- Herb Martin > > -- > Roland Hall > /* This information is distributed in the hope that it will be useful, but > without any warranty; without even the implied warranty of merchantability > or fitness for a particular purpose. */ > Online Support for IT Professionals - > http://support.microsoft.com/servicedesks/technet/default.asp?fr=0&sd=tech > How-to: Windows 2000 DNS: > http://support.microsoft.com/default.aspx?scid=kb;EN-US;308201 > >
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