DNS Tips

[rosy]

I dont know about DNS

[sajis18]

DNS troubleshooting is an absolutely vital process in Active Directory. It is important to keep DNS healthy and to know how to repair it when it breaks.

Let's take a look at some common DNS problems and the tools to use for DNS troubleshooting.

Typical DNS errors include the following:

* DNS Lookup Failure -- usually indicated on events in the system or Directory Service event logs.
* Unable to Find a Domain Controller for the Domain Logon Failure -- caused by unable to contact the domain. Typically the "unable to contact the domain" error means a DC for the domain can't be contacted, which usually is due to a DNS failure.

These and similar errors can show up in a variety of places -- often in the description of an event. For instance, the famous replication error, event 1311, often lists "DNS Lookup Failure" in the description. The repadmin/showrepl command may expose a DNS failure, or DCPromo may indicate "unable to contact domain." You get the idea.

AD Replication failure may indicate that replication failure to a DC failed, and the DC is identified by its alias or Cname record name, such as ._msdcs.corp.net, indicating a possible incorrect Cname record.

Diagnosing the problem usually starts with simple tests. If the error occurs on some interactive command, such as a logon or DCPromo, then a quick ping of the fully qualified domain name is helpful. If pinging the FQDN fails, then ping the IP address. That will isolate the problem to either a DNS or a network problem. Remember, you can ping the domain name, and it will return the IP address of one of the DNS Servers:

If DCpromo fails with a DNS error, see if you can ping the domain name from that server.

NSLookup is a helpful tool. It is handy if you are trying to resolve Internet DNS names as well as local names. It lets you know if the name can be resolved. Remember that NSLookup requires defined reverse lookup zones in ord............................

[ami1990]

Thank you so much for sharing these tips. They are really informative.

Website Designers London

[sanseo]

good articles !!

there is so many dns look up, But i like this [http://network-tools.com].
There is so many test and accurate in results.

[sim000]

Hello
As broadband services become more widely available, the need for dynamic DNS services grown increasingly important. While setting up a dynamic client is quite simple, there are certain tricks that can be used to ensure your domain is managed most efficiently.

In order to manage your dynamic DNS records using your DNS Park account, you need to create a DDNS user that will be used to authenticate any changes you make (separate from your DNS Park User login) and at least one Host Record that is marked as dynamic.

To create a DDNS user, log in to your DNS Park Account and click on Account Information in the Configuration Menu, and then DDNS Users. Provide a Username and Password for authenticating the requests that are made. Check the box labeled 'Active'. Click the button labeled Update Dynamic Users. You can always return to this screen to modify, remove, or add additional Dynamic DNS users.

[mathew24]

Wow it's really Good tip, thanks for post this....!

[arslan321]

hi thanks for sharing this.

[dave1280]

Thanks for the awesome and interesting info on DNS and its been such a useful information.... thanks for sharing........

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[newman9800]

Good, its a basic understanding for beginners.Thank you...................
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[nnelsotn55]

Thanks for sharing such good tips with us.

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[oliver6419]

Flush DNS

First of all it would be a good idea to flush the local DNS cache so we are
starting with a clean ***!

To do this simply enter: ipconfig /flushdns in a command prompt. You will
then get the following window appear confirming the flush,



[Ad: DNS Windows XP]

Successful DNS Flush

Now we have a clean DNS cache lets make the changes to the registry.
Block Negative Entries

To force Windows XP NOT to cache negative entries we need to add a new DWORD
to the following Registry key:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet
\Services\Dnscache\Parameters

DWORD: MaxNegativeCacheTtl

Value: 0

This will now ensure NO negative entries are stored
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[web_design]

This is a good page to get DNS tips and tricks http://www.petri.co.il/dns

[charcoal]

good thread, good tips, tnx

[FINNEGAN.JAXON]

Switching your DNS won't increase your speed if you're using a phone as a modem.
Make sure your phone is operating on 3G/UMTS, or purchase a phone that can.

[Timothy8797]

I think that you'd better contact your web hosting provider.
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