How to check DNS health?
DNS Server
Domain Name System is a service that can be installed on any windows server operating system to resolve the Name to IP Address and vice-versa. TCP/IP networks, such as the Internet, use DNS to locate computers and services through user-friendly names.
DNS is the most critical infrastructure, that’s publicly available for use to everybody out there. You can in fact say that, it’s a single point of failure, that can take down the World Wide Web.
Without DNS we can not imaging internet. You know before DNS how websites were getting resolved Name to IP address. At that time, We use the host file and make the point the website names to web server where websites were hosted. this was manually task and not possible to do for all websites and it was required on each and every systems where you want to access the websites by name.
DNS Port No
This is very important to know about DNS port number.without port number we can not start any DNS related troubleshooting as well can not create any forwarder because we should know about before doing DNS operation tasks, 53 is the port number of DNS. DNS port should be opened between DNS server to your web server as well to DNS client to perform the name resolution.
DNS Server Health Test
In this tutorial, I’ll show you how to use the Dcdiag command line utility to perform a domain controller health Check.
Using the DCdiag.
i.e. (dcdiag /test:dns /v /e)
How to test DNS with DCDiag
The DNS diagnostics also includes several tests.
Here are the tests that are required to performed, by default all tests except external name resolution.
/DnsBasic (basic tests, can’t be skipped)
/DnsForwarders (forwarders and root hints tests)
/DnsDelegation (delegations tests)
/DnsDynamicUpdate (dynamic update tests)
/DnsRecordRegistration (records registration tests)
/DnsResolveExtName (external name resolution test)
/DnsAll (includes all tests above)
/DnsInternetName: <internet name> (for test /DnsResolveExtName)
dcdiag /s:dco1 /test:dns
So, that’s all in this blog. I will meet you soon with next stuff .Have a nice day !!!
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