View Full Version : DNS Tips

02-08-2008, 02:03 AM

Let me share some knowledge related to DNS. I hope you are aware of the tool dig that comes with linux.

To check your nameservers are properly responding and to override the cache of your ISP, go for a recursive query.

dig +trace domain.com

Here you will see the query going to root name servers and then it refers to top level domains and finally it reaches your nameservers and from it resolves your ip.

You can also check if the nameservers are properly functioning by

dig domain.com @ns1.domain.com and
dig domain.com @ns2.domain.com


02-13-2008, 07:13 AM
I do not understand question.
You can check for quick DNS on

If you need more test regarding DNS, WHois etc... you can check

02-18-2008, 06:36 AM
sparktechs I think that you'd better contact your web hosting provider with this problem ;)

02-27-2008, 02:30 AM
I second intodns.com, great service with a lot of info to analize.

04-10-2008, 04:41 AM
I Can not understand your Question Properly. But I give you some info about DNS it may be help full for You........
Domain Name System Client Behavior in Windows Vista
Microsoft® Windows Vista™ includes both Internet Protocol version 4 (IPv4) and Internet Protocol version 6 (IPv6) protocol stacks that are installed and enabled by default. Domain Name System (DNS) name queries and registrations can now involve both IPv4 address records (A records) and IPv6 address records (AAAA records). This article describes the behavior of the DNS Client service in Windows Vista for DNS queries and registrations and the possible impact on DNS traffic.
Note: This article does not describe changes to DNS client behavior in versions of Windows released after Windows Vista with Service Pack 1 and Windows Server 2008, including additional service packs or other updates.
DNS Query Behavior
Computers running Windows Vista need to perform both A and AAAA queries to determine the best method of connectivity to the desired endpoint. By obtaining both IPv4 and IPv6 addresses, there is an increased chance of being able to access the desired endpoint if one of the addresses is unreachable.
The DNS Client service in Windows Vista has been designed to minimize the impact on DNS servers when performing DNS name queries through the following behavior:
• If the host has only link-local or Teredo IPv6 addresses assigned, the DNS Client service sends a single query for a records.
• If the host has at least one IPv6 address assigned that is not a link-local or Teredo address, the DNS Client service sends a DNS query for A records and then a separate DNS query to the same DNS server for AAAA records. If an A record query times out or has an error (other than name not found), the corresponding AAAA record query is not sent.
This DNS querying behavior will assist enterprises and ISPs in their transition to IPv6. When AAAA records are added to DNS either manually or through DNS dynamic update, computers running Windows Vista will by default use IPv6 over IPv4, providing proof to IT staff that the IPv6 routing and name resolution infrastructure is working properly for IPv6 connectivity. When organizations transition to an IPv6-only infrastructure and disable IPv4, the DNS Client service will send only AAAA queries.
Computers running Windows Vista can increase DNS traffic and the load on DNS servers when the computers have been configured with a global address:
• On intranets that have deployed IPv6 (either native or ISATAP), there will be additional DNS query traffic. However, deployments of Windows Vista in enterprise networks using IPv6 have not resulted in dramatic increases in the loads on intranet DNS servers. Intranets running at or near capacity for DNS might need to provide additional capacity to better support an enterprise deployment of Windows Vista.
• On the Internet, computers running Windows Vista by default will typically not be configured with a global address from their ISPs or from their gateway devices. At this time, typical ISPs do not support native IPv6 connectivity and typical home routers do not support the 6to4 transition technology. If a computer running Windows Vista is located behind a network address translator (NAT), the Teredo client component will automatically configure a global Teredo address, even if it is in an inactive state. However, a computer running Windows Vista will not send AAAA record queries if it only has a Teredo address assigned.
DNS Registration Behavior
The DNS Client service in Windows Vista uses DNS dynamic update and attempts to register the following records:
• A records for all IPv4 addresses assigned to the interfaces that are configured with a DNS server
• Pointer (PTR) records for IPv4 addresses assigned to interfaces that are configured with a DNS server
• AAAA records for all global IPv6 addresses assigned to interfaces that are configured with a DNS server
Teredo addresses are not registered.
For the typical intranet host configured with a global IPv6 address, additional AAAA records for IPv6 global addresses are registered. However, a DNS dynamic update client includes all of the records that they are registering in a single packet. Therefore, although there are additional records to register, there are no additional packets for AAAA record registration. Therefore, the impact on intranet DNS servers for AAAA registration is minimal.
Typical Internet-based DNS servers do not support DNS dynamic update. However, if an Internet-based DNS server did support DNS dynamic update, there is typically no additional traffic because the typical Windows Vista-based Internet host does not have a global IPv6 address assigned and Teredo addresses are not registered. Therefore, for typical Windows Vista-based hosts on today's Internet, there is no performance impact on Internet DNS servers for DNS registration.

05-06-2008, 07:11 AM
I do not understand question.
You can check for quick DNS on

If you need more test regarding DNS, WHois etc... you can check

01-14-2009, 08:08 AM
intodns.com is good to text dns nameservers.

02-08-2009, 10:15 PM

03-08-2009, 11:15 AM
thank you for intodns.com site , it was great

03-26-2009, 08:28 AM
Try OpenDNS :) Its Smooth

05-15-2009, 04:11 AM
Typical DNS errors include the following:

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."

07-11-2009, 06:42 AM
thanks for sharing these tips.

09-09-2009, 08:45 AM
Yeah!! You're right..I think you can also get it checked online anywhere..
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09-16-2009, 10:06 AM
Great Tips Provide by you regarding the DNS. Actually I doen't know about DNS so these information is helpful for me.
Thank you for share with us.

10-07-2009, 03:30 AM
thank u one and all for providing great information regarding DNS Tips.....

10-29-2009, 04:02 AM
I dont know about DNS

11-02-2009, 01:58 AM
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............................

01-05-2010, 05:26 AM
Thank you so much for sharing these tips. They are really informative.

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01-28-2010, 03:20 AM
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.

01-28-2010, 06:26 AM
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.

02-10-2010, 03:26 AM
Wow it's really Good tip, thanks for post this....!

02-15-2010, 01:22 PM
hi thanks for sharing this.

02-26-2010, 01:33 AM
Thanks for the awesome and interesting info on DNS and its been such a useful information.... thanks for sharing........

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03-09-2010, 11:00 PM
Good, its a basic understanding for beginners.Thank you...................
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05-07-2010, 01:08 PM
Thanks for sharing such good tips with us.

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07-10-2010, 11:35 PM
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:


DWORD: MaxNegativeCacheTtl

Value: 0

This will now ensure NO negative entries are stored
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10-18-2010, 10:42 AM
This is a good page to get DNS tips and tricks http://www.petri.co.il/dns

10-19-2010, 05:20 AM
good thread, good tips, tnx

10-21-2010, 02:15 AM
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.

11-12-2010, 05:11 AM
I think that you'd better contact your web hosting provider.
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11-20-2010, 02:29 PM
Thanks for sharing it here, it may be helpful to ones like me that are greedy for IT info.

12-08-2010, 05:40 AM
DSn is Domain Name System
Some domain types and their meaning.

com Commercial Organization
edu Educational
gov Government
mil Military

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12-09-2010, 06:16 PM
www.DNSStuff.com works great for me.

02-03-2011, 03:40 PM
Well all of you providing really great tips regarding DNS tips.

02-08-2011, 03:14 AM
www.DNSStuff.com works great for me.

thanks for sharing this link

02-11-2011, 03:53 AM
www.DNSStuff.com works great for me.

but it's paid, any free similar tools?

03-19-2012, 12:58 AM
If you're using a phone as a modem then changing your DNS can not boost your rate. You should operate your phone at 3G/UMTS or buy a new phone.

04-02-2012, 06:17 AM
Thanks for the DNS tips that you have provided over here. I am greatly looking for those tips. Knowing these things was really important for me. So thanks a lot guys!

04-04-2012, 02:56 AM
For Windows vista both A and AAA queries are important. Knowing the DNS will helps lot in such cases. Please share your views on this. Thanks a lot.

05-16-2012, 02:25 AM
Try Here (http://www.howstuffworks.com/dns.htm), you can get some tips.

05-21-2012, 10:26 PM
Thank you for sharing ! well gotta figure out and deal with it later on DNS.

09-10-2012, 06:51 AM
These and comparable mistakes can display up in a range of places, over and over again in the report of an occasion. For a case in point, the well-known replication error, event 1311, and many others.

01-12-2013, 10:27 AM
When DNS problems occur, one of the first things you should do is verify that the DNS server still has network connectivity. After all, if the problem ends up being something as simple as a NIC failure, you can save yourself a lot of time by checking for the problem up front.

The easiest way to verify connectivity is to log on to the DNS server and try to ping a few machines. You should also try to ping the DNS server from a few random machines. Remember that ping will work only if you allow ICMP packets through the firewall on the machine you are pinging.