Windows XP / DNS Queries

  • Thread starter Thread starter Mark Broyd
  • Start date Start date
M

Mark Broyd

I run a network consisting of Windows 2000 Server, and a mix of Windows 2000
/ XP desktops.

We access an https service external to our main office, which runs perfectly
OK on the Windows 2000 desktops. However, on the XP machines, the
application runs much slower. Other https sites seem to work OK on the XP
machines, so this led me to performing a sniff on the network.

Comparing the network traces of the Windows 2000 and XP systems I found just
one difference in that the XP systems are attempting an SRV query 3 times as
follows;

"Standard query SRV
_kerberos._tcp.Default-First-Site-Name._sites.dc._msdcs.www.abc.com"

Later on in the trace, the above query is responded to with "Standard query
response, Server failure", however the XP systems are still able to access
the web page. We have tried adding an entry for the web site in to the
hosts file, but this does not make any difference.

My thinking so far is that the performance problem on the XP systems is due
to the SRV query being attempted. I guess what I need to find out is what
exactly is different between XP and Win2K in this respect and how to change
XP's behaviour. Any help would be appreciated.

Many thanks
Mark
 
Check the ipconfig/all on the clients. Does everything point to your
server-IP? How many nics in your server?

Marina
 
All my XP clients are DHCP clients, so I know that is OK. I have two NICs
in the DNS server.

Many thanks
Mark
 
Preferred DNS points to itself and alternate DNS points to an external DNS
server.

Many thanks
Mark
 
Take out the external DNS entry. You only need to point to your server-IP on
the preferred DNS field.
You put the ISP-DNS-numbers in tab Forwarders of your DNS-server.
 
I have configured as you have suggested, however my problem still occurs.

Regards
Mark
 
Hi Marina

The ipconfig from the XP desktop is as follows;

Windows IP Configuration
Host Name . . . . . . . . . . . . : ABCWRK08
Primary Dns Suffix . . . . . . . : abc.com
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No
DNS Suffix Search List. . . . . . : abc.com

Ethernet adapter Local Area Connection:
Connection-specific DNS Suffix . : abc.com
Description . . . . . . . . . . . : SiS 900-Based PCI Fast Ethernet Adapter
Physical Address. . . . . . . . . : 00-0C-6E-27-33-4E
Dhcp Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
IP Address. . . . . . . . . . . . : 192.168.1.161
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 192.168.1.30
DHCP Server . . . . . . . . . . . : 192.168.1.7
DNS Servers . . . . . . . . . . . : 192.168.1.7
217.151.101.7
Primary WINS Server . . . . . . . : 192.168.1.7
Secondary WINS Server . . . . . . : 192.168.1.5
Lease Obtained. . . . . . . . . . : 19 December 2003 16:13:07
Lease Expires . . . . . . . . . . : 27 December 2003 16:13:07

Best Regards
Mark
 
Hi Mark,

Doesn't look good. Everything should *only* point to your server-IP. That
external DNS-address certainly doesn't belong in the ipconfig.
How many servers do you have and how many nics in the server?
 
Hi Marina

DCHP scope has been changed so that external DNS is no longer
included. Problem still occurs. The internal DNS server has two
NICS, both serving internal subnets.

Regards
Mark
 
Hi Marina

Thanks for your help, but I have resolved the problem. The network
trace I carried out in the initial troubleshooting stages threw me
completely off course. The problem actually related to having to
disable the 'Enable Integrated Windows Authentication' option in
Internet Explorer on WinXP desktops. This option is not available in
Win2K which is why my Win2K desktop did not suffer.

Many thanks
Mark
 
Hi Mark,

Glad you've got it solved now. But you've improved the serversettings in the
meantime too.
Thanks for reporting back.
 
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