That is correct make sure your DCs only point to internal DNS servers like you currently have. All clients should have the same setup.
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DNS Clarification for two internal DNS servers
Windows 2003 network. 2 dedicated domain controllers both running DNS as well , about 10 member servers serving about 100 people. Currently configured like this:
DC1 - 1st DNS entry points to self
2nd DNS entry points to DC2
DC2 - 1st DNS entry points to self
2nd DNS entry points to DC1
In the "Forwarder" entries on both, I have two external DNS servers listed provided by our ISP.
Is that how it supposed to be? We are on a bonded T1 and external access (mainly download speeds) are PAINFULLY slow. I'm talking anywhere from 17kbps to maybe 160kbps when downloading files from the internet. Thanks for any suggestions in advance.
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Answers
Is there a tool I can use from my workstation that will allow me to find out exactly what kind of traffic (and preferrably an IP address of the offender) is causing the slowness when things bog down? I run a Sonicwall NSA3500, but trying to figure out what is happening in real time using the logs is pretty cryptic.
You may want to look at squeezing in a monitoring box between your firewall and your LAN. Something like Untangle does this job fairly nicely and it can operate in bridge mode so that you don't need to change anything. Alternatively, if your LAN switch has mirroring capability, you can mirror your firewall port to a real-time analyser like ntop. This will give you an exact idea of where your traffic is going. Otherwise, maybe just ask your ISP?
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by: stefanxPosted on 2009-09-23 at 14:22:01ID: 25408092
Your DNS setup sounds fine to me, but I don't think this has anything to do with your slow downloads ;)
You can really only think of DNS as being the culprit if your browser spends a long time saying "Looking up..."