Kevin D. Goodknecht Sr. [
Guest
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 Posted:
Mon Nov 07, 2005 9:51 am Post subject:
Re: DNS Recursion Questions |
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kupriaa1 <kupriaa1@discussions.microsoft.com> wrote:
| Quote: | I have cut a dns zone for testing purposes-
test.com on server1
sub.test.com on server2
on server1 i configured the glue record point to dns.sub.test.com
with the appropiate IP address. at this point server1 does not know
how to resolve dns.sub.test.com since this record is actually located
on server2. Server1 is configured to support recursive queries.
The DNS resovler on the client is configured for Server1. When the
client queries Server1 for test.sub.test.com, Server1 sends the
forwarding query to Server2 using the IP address configured on the
glue record- THIS DOES NOT CONFORM TO RFC 1035- not the end of the
world however.
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What do you think the glue record is for?
If a zone is delegated to another DNS server, the first server will go get
the answer from the second using the glue to find the second and cache the
answer.
| Quote: |
Where it gets strange. When i disable the recursion on Server1 and
query
for test.sub.test.com, Server1 responds to the client with the
appropiate referral conforming to RFC 1035 (NS records without the IP
address), XP doesnt attempt resolving the NS record. Granted XP is
designed for recursion- but ....
XP will not resolve DNS names, only DNS servers will. That's why you must |
use recursive DNS servers in the DNS client settings.
If DNS server1 supports recursion it should get the answer for the client.
If a DNS server does not support recursion it cannot be used a a resolving
proxy DNS, because it will only resolve names it has in its zones and return
referrals for names it does not own.
| Quote: |
Am i off the beaten trail? shouldnt the client resolver attempt to
finish
the query?
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The DNS client does not use recursion, it will not resolve names, it is
basically the DNS cache. It is up to the DNS server to get the answer and
return it to the DNS client on XP.
--
Best regards,
Kevin D. Goodknecht Sr. [MVP]
Hope This Helps
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