Solved

Slow dns resolution

Posted on 2008-10-21
5
584 Views
Last Modified: 2012-05-05
I have a server running SBS 2003 without the ISA server. There were no issues until this last weekend when I shut down the server to move it to a new server room. Upon rebooting the server at its new location, all internet is horribly slow both on the server and on all clients. The server was setup to resolve all dns (standard setup). Running a ping to an outside server takes about 15-20 seconds to resolve, and then once resolved it responds with very low latency. Similarly, when loading a large website, the dns takes forever to resolve, but after resolution, it loads very fast.

I tried switching the dns on the server and also the DHCP settings for the workstations to point towards the ISP's DNS servers. This resolved the resolutions issues for the outside web, but created a lot of issues on the internal network with name resolution.

Any forum I've searched so far about the issue seems to recommend simply using the ISP's dns servers for everything. I however, don't see this being a viable solution as I need the server to resolve the dns. Any help would be great!
0
Comment
Question by:b00meRr
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
5 Comments
 
LVL 2

Expert Comment

by:Shecky919
ID: 22770869
What is the resolution time like if you try to ping internally? I'd suspect bad cable to switch port for where the server is now.
0
 
LVL 6

Expert Comment

by:powercram
ID: 22770906
Using your ISP's DNS servers exclusively is not a good solution - as you mentioned it creates problems with your MS domain.  In order for AD to work properly your clients need to use at least one internal AD/DNS server.

Try to ping the root DNS servers by IP address.  Are you having any trouble accessing them?
0
 
LVL 59

Expert Comment

by:Darius Ghassem
ID: 22771122
You should put your local DNS server's IP address in the server's TCP\IP. Also, you should only have your local DNS server IP listed in the client's TCP\IP settings. Check to make sure your Forwarders are up to date. You should never have an external IP address within the local network.


http://www.windowsnetworking.com/articles_tutorials/DNS_Conditional_Forwarding_in_Windows_Server_2003.html
0
 

Author Comment

by:b00meRr
ID: 22777760
The local DNS server's IP address is what I have in the server's TCP/IP. The server is a standalone server. It performs all DNS queries. The forwarders have been checked and are up to date. Pinging this server from the internal network is fast. However, the first ping to the server usually takes a little longer.
First pings are usually around 130ms, all subsiquent pings are 1ms.
As long as all dns pointers are pointed toward the SBS, the internal network runs fast. No problems. It's only when trying to resolve outgoing DNS queiries that it hangs.

Is there a way to recreate the DNS and possibly WINS databases? I suspect they may be corrupt.
0
 
LVL 59

Accepted Solution

by:
Darius Ghassem earned 500 total points
ID: 22778431
Go into DNS clear the cache & Reload the zone.
0

Featured Post

How our DevOps Teams Maximize Uptime

Our Dev teams are like yours. They’re continually cranking out code for new features/bugs fixes, testing, deploying, responding to production monitoring events and more. It’s complex. So, we thought you’d like to see what’s working for us. Read the use case whitepaper.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

The problem of the system drive in SBS 2003 getting full continues to be an issue, even though SBS 2008 and SBS 2011 are both in the market place.  There are several solutions to this, including adding additional drive space or using third party uti…
There have been a lot of times when we have seen the need to enter a large number of DNS entries in a forward lookup zone. The standard procedure would be to launch the DNS Manager console, create the Zone and start adding new hosts using the New…
I've attached the XLSM Excel spreadsheet I used in the video and also text files containing the macros used below. https://filedb.experts-exchange.com/incoming/2017/03_w12/1151775/Permutations.txt https://filedb.experts-exchange.com/incoming/201…

740 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question