Question

Slow Internet on WinXP with Server 2008 DNS

Asked by: Quetzal

New DC and file server using Server 2008.  When WinXP computers on the LAN are using this server as DNS, Internet browsing is extremely slow and "page not found" errors crop up frequently.  If machine DNS is set to 4.2.2.2 or to the old Server 2003 DC and file server, these same page refs are very fast and there are no "page not found" errors.  Changing the DNS back and forth this problem can be reproduced at will.

This server (Svr09) replicates AD with another server on another site (Svr01).  It also does DFS replication with the old Server 2003 DC (Svr02) and with Svr01.  DNS is configured with forwarders to ISP DNS.  Server has a static ip and the DNS setting on its nic is set to the actual ip.

The machines on the LAN are all WinXP, so we don't know if this issue would occur with Vista.

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Asked On
2009-09-23 at 12:49:33ID24756315
Tags

Server 2008 DNS slow Internet WinXP

Topics

Domain Name Service (DNS)

,

Windows Server 2008

,

Windows XP Operating System

Participating Experts
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Comments
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Answers

 

by: dariusgPosted on 2009-09-23 at 13:17:17ID: 25407447

Disable IPv6 on the Windows 2008 server make sure there are no external DNS servers listed in your TCP\IP settings. Run ipconfig /flushdns, ipconfig /registerdns, dcdiag /fix.

Have you entered the DNS Forwarders in your Windows 2008 server also?

 

by: QuetzalPosted on 2009-09-23 at 14:17:06ID: 25408040

WRT IPv6.  I happen to be one of those people who want to begin to grapple with IPv6 properly and gradually rather than to avoid it.  To that end, we're using stateful configuration and this server's IPv4 address and gateway address were converted to IPv6 and the nic was configured with both IPv4 and IPv6 (see attached).  IPV6 is not enabled in DHCP.  Is there anything wrong with this approach?

WRT TCP/IP settings.  Only the server's static ip address is entered as DNS (see attached).

WRT DNS Forwarders.  There are 2 and both are the ISP's DNS servers.

 

by: dariusgPosted on 2009-09-23 at 14:23:59ID: 25408105

IPv6 for internal use really isn't needed and most likely will never really be needed. If you enabled Ipv6 on the servers then all clients should be running the same configuration if not confusion with DNS and TCP\IP can cause issues. If you want to tackle IPv6 then you need to make your whole network be IPv6 compatiable to standarizing it.

One other problem is that the DC isn't pointing to it's IP address it is only poiting to  192.168.20.250 this could slow down DNS as well.

 

by: QuetzalPosted on 2009-09-23 at 15:00:12ID: 25408406

omg, how times I've stared at that address.  .250 is the the old DC.  It's fixed, but that did not resolve the slow Internet.

WRT IPv6.  I'll disable during my upcoming maintenance window and get back.

Thanks for sharper eyes than mine.

 

by: dariusgPosted on 2009-09-23 at 15:03:48ID: 25408451

Did you place the IP address of the DC as primary? Run ipconfig /flushdns, ipconfig /registerdns, and dcdiag /fix. Check to see if this speeds it up a little.

 

by: QuetzalPosted on 2009-09-23 at 15:09:56ID: 25408508

dcdiag showed NCSecDesc failure.  I will followup on this

ipconfig's and dcdiag did not resolve the issue.

 

by: QuetzalPosted on 2009-09-23 at 15:10:44ID: 25408515

And I did correct primary DNS address to point to .251, no secondary is specified.

 

by: dariusgPosted on 2009-09-23 at 15:13:59ID: 25408544

After disabling Ipv6 Run ipconfig /flushdns, ipconfig /registerdns, and dcdiag /fix

 

by: QuetzalPosted on 2009-09-23 at 17:22:07ID: 31632659

After disabling IPv6, still had problem.  Of all the advice offered, I had not re-checked the DNS forwarders.  Replaced with different ISP forwarders and problem was resolved.  Thank you for all of your helpful tips.

20120131-EE-VQP-002

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