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Tag: dns

30 June 2017

What is Authoritative and Non-authoritative DNS Server

Written by Rahul
What is Authoritative and Non-authoritative DNS Server? Understand the difference between Authoritative and Non-answer for DNS query in simple words. What is Non-Authoritative DNS Server? Non-authoritative name servers do not contain original source files of domain’s zone. They have a cache file for the domains that is constructed from all the DNS lookups done...
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23 June 2017

nslookup Command in Linux (Name Server Lookup)

Written by Rahul
nslookup stands for “name server lookup” is a useful command for getting information from DNS server. It also very useful for troubleshooting DNS related issues. It queries to DNS (Domain Name Server) and get the dns records for any domain for ip address. In this tutorial you will get some useful examples for nslookup...
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21 October 2015

How to Configure DNS Settings on Ubuntu & LinuxMint

Written by Rahul
To configure your system on network and access internet. You also need to configure dns server. It is necessary to access websites by their name. When we visit a website, system first search for dns server we provided in configuration file. Then query to that DNS server for providing ip address corresponding to that...
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08 October 2015

How to Setup Forward Only DNS Server on Ubuntu & Debian

Written by Rahul
The Domain Name System (DNS) is a hierarchical distributed naming system for computers connected over network. It resolves ip address correspondence to a domain name. A forward-only DNS server does not keep the domain information. If any query comes to this server, it forwards to the configured DNS server. A details information about DNS...
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08 October 2015

How to Configure DNS Server on Ubuntu & LinuxMint

Written by Rahul
The Domain Name System (DNS) is a hierarchical distributed naming system for computers connected over network. It resolves ip address correspondence to a domain name. There are four type of dns servers . This article will help you to configure dns server (Domain Name System) using bind packages on Ubuntu, Debian and LinuxMint systems....
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17 February 2015

How To Clear DNS Cache on Windows

Written by Rahul
When you access any domain from your system, an IP of the remote system is resolved by the DNS server. When you access it the first time, IP is directly resolved from DNS server’s, then the system makes a cache on the local system to as not to send a query to the DNS...
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01 December 2014

What is Google Apps MX Records for DNS ?

Written by Rahul
MX records in DNS are used to route emails to correct mail servers and properly send to correct destination server. If you are using Google apps account for hosting email accounts on Google servers for your domains, then you need to add following MX records in your domains DNS configuration. Google Apps MX Records:...
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07 January 2014

How to Setup Caching NameServer on CentOS/RHEL 6/5

Written by Rahul
Definition at Wikipedia: Caching name servers, also called DNS caches, store DNS query results for a period of time determined in the configuration (time-to-live) of each domain-name record. DNS caches improve the efficiency of the DNS by reducing DNS traffic across the Internet, and by reducing load on authoritative name-servers, particularly root name-servers. Because...
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04 April 2013

How to Check DNS ( BIND ) Configuration File

Written by Rahul
Command named-checkconf checks the syntax only of a named ( bind ) configuration file. The file is parsed and checked for syntax errors, along with all files included by it. If there is no file is specified with the command, /etc/named.conf is read by default. 1. Check DNS (Bind) Configuration In case of any...
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02 April 2013

How to Setup DNS (Bind) Server on CentOS/RHEL 7/6/5

Written by Rahul
The DNS (Domain Name System) is a distributed system, used for translate domain names to IP address and vice a versa.For example when we type domain name in browser url like “https://tecadmin.net”, Our computer sends a request to DNS and get an ip address of domain. This article will help you to step by...
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