Re: Slow DNS lookup

From: Kevin D. Goodknecht Sr. [MVP] (admin_at_nospam.WFTX.US)
Date: 08/20/04 

Date: Fri, 20 Aug 2004 07:29:07 -0500

In news:u%235vkLphEHA.2848@TK2MSFTNGP10.phx.gbl,
Peter Schou <psc@EM_MAPS_TNOD_flexatel.com> wrote their comments
Then Kevin replied below:
> Thanks for your reply Kevin.
>
> I havent found any 7063 events in my log.
> Every thing seems to be working OK now. However I will
> try using the forwarders you suggested in a previous post.
>
> Sorry I forgot to tell you my forwarder timeout. Its set
> to 5 sec. Lowering this value did help, but didn't
> resolve the problem. Now using 5 sec again. Is 5 the
> default value?

5 Sec is default, but you cannot use the DNS servers you posted as
forwarders, a forwarder must do recursive lookups. You would be better
disabling forwarders than using a non-recursive DNS as a forwarder.
Forwarders are not required, DNS is still able to resolve queries buy
getting referrals from the root servers, through root hints.

Below is a query I tried on the DNS servers you are using, notice the rd
flag and the lack of an ra flag. Also notice it only returned a referral to
the gTLD servers and one only returned the gTLD servers by name not even an
IP address.

opcode: Query, status: NOERROR, id: 42
flags: qr rd; QUERY: 1, ANSWER: 0, AUTHORITY: 13, ADDITIONAL: 13

QUESTION SECTION:
lsaol.com. IN ANY

AUTHORITY SECTION:
com. 71555 IN NS i.gtld-servers.net.
com. 71555 IN NS f.gtld-servers.net.
com. 71555 IN NS h.gtld-servers.net.
com. 71555 IN NS d.gtld-servers.net.
com. 71555 IN NS k.gtld-servers.net.
com. 71555 IN NS j.gtld-servers.net.
com. 71555 IN NS a.gtld-servers.net.
com. 71555 IN NS l.gtld-servers.net.
com. 71555 IN NS g.gtld-servers.net.
com. 71555 IN NS e.gtld-servers.net.
com. 71555 IN NS m.gtld-servers.net.
com. 71555 IN NS c.gtld-servers.net.
com. 71555 IN NS b.gtld-servers.net.

ADDITIONAL SECTION:
i.gtld-servers.net. 75826 IN A 192.43.172.30
f.gtld-servers.net. 75826 IN A 192.35.51.30
h.gtld-servers.net. 75826 IN A 192.54.112.30
d.gtld-servers.net. 75826 IN A 192.31.80.30
k.gtld-servers.net. 75826 IN A 192.52.178.30
j.gtld-servers.net. 75826 IN A 192.48.79.30
a.gtld-servers.net. 71430 IN A 192.5.6.30
l.gtld-servers.net. 75826 IN A 192.41.162.30
g.gtld-servers.net. 75826 IN A 192.42.93.30
e.gtld-servers.net. 75826 IN A 192.12.94.30
m.gtld-servers.net. 75826 IN A 192.55.83.30
c.gtld-servers.net. 75826 IN A 192.26.92.30
b.gtld-servers.net. 75826 IN A 192.33.14.30

Query time: 341 ms
Server : 193.162.153.164:53 udp (193.162.153.164)
When : 8/20/2004 7:22:36 AM
Size rcvd : 459

opcode: Query, status: NOERROR, id: 42
flags: qr rd; QUERY: 1, ANSWER: 0, AUTHORITY: 13, ADDITIONAL: 0

QUESTION SECTION:
lsaol.com. IN ANY

AUTHORITY SECTION:
com. 172796 IN NS I.GTLD-SERVERS.NET.
com. 172796 IN NS J.GTLD-SERVERS.NET.
com. 172796 IN NS K.GTLD-SERVERS.NET.
com. 172796 IN NS L.GTLD-SERVERS.NET.
com. 172796 IN NS M.GTLD-SERVERS.NET.
com. 172796 IN NS A.GTLD-SERVERS.NET.
com. 172796 IN NS B.GTLD-SERVERS.NET.
com. 172796 IN NS C.GTLD-SERVERS.NET.
com. 172796 IN NS D.GTLD-SERVERS.NET.
com. 172796 IN NS E.GTLD-SERVERS.NET.
com. 172796 IN NS F.GTLD-SERVERS.NET.
com. 172796 IN NS G.GTLD-SERVERS.NET.
com. 172796 IN NS H.GTLD-SERVERS.NET.

Query time: 200 ms
Server : 194.239.134.83:53 udp (194.239.134.83)
When : 8/20/2004 7:22:52 AM
Size rcvd : 251 

-- 
Best regards,
Kevin D4 Dad Goodknecht Sr. [MVP]
Hope This Helps
================================================
-- 
When responding to posts, please "Reply to Group"
via your newsreader so that others may learn and
benefit from your issue, to respond directly to
me remove the nospam. from my email address.
================================================
http://www.lonestaramerica.com/
================================================
Use Outlook Express?... Get OE_Quotefix:
It will strip signature out and more
http://home.in.tum.de/~jain/software/oe-quotefix/
================================================
Keep a back up of your OE settings and folders
with OEBackup:
http://www.oehelp.com/OEBackup/Default.aspx
================================================

Relevant Pages

  • Re: Slow DNS lookup
    ... Peter Schou made a post then I commented ... > forwarders you suggested in a previous post. ... Just wanted to jump in and add that what Kevin is trying to say is that the ... than the zones that were created in their own DNS servers). ...
    (microsoft.public.win2000.dns)
  • Re: Slow DNS lookup
    ... Thanks Ace for taking your time to drop in. ... I have already disabled forwarders on my server and are now only using ... using those addresses Kevin gave me. ... > content only DNS servers and will not resolve queries ...
    (microsoft.public.win2000.dns)
  • Re: DNS recursion question while studying for 70-293
    ... it will query the servers listed as ... forwarders and then return a negative if it can't resolve the query with ... My question is about the servers that are queried as forwarders (DNS B & ... those servers do not have recursion disabled, ...
    (microsoft.public.cert.exam.mcse)
  • DNS recursion question while studying for 70-293
    ... I think I understand that if I have a server with a couple of forwarders ... it will query the servers listed as ... forwarders and then return a negative if it can't resolve the query with the ... My question is about the servers that are queried as forwarders (DNS B & C): ...
    (microsoft.public.cert.exam.mcse)
  • Re: Stale records in DNS
    ... Query each of these servers to make sure they have the correct MX records. ... If you use forwarders, query these servers to see if they are reporting ... Using SBS 2003. ...
    (microsoft.public.windows.server.dns)