What Is NXDOMAIN?

What is NXDOMAIN? How does nxdomain affects my browsing? Explains the relationship between NXDOMAIN and DNS Hijacking.

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Wikipedia Site Not Reachable Due To DNS Issues

Wikipedia Explains Today’s Global Outage – Wikipedia.org is one of the busiest website on the Internet went down today due to DNS issues.

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25 Years Of The .com

The domain name .com is a generic top-level domain (gTLD) in the Domain Name System of the Internet. .COM is one of the first set of gTLD. It was first implemented for use on the Internet in January 1985. The internet celebrates a landmark event on the 15 March – the 25th birthday of the day the first dotcom name was registered.

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CentOS: Use OpenDNS To Resolve Hostnames

How do I use OpenDNS server for my CentOS Linux vps or dedicated server to resolve hostnames?

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Ubuntu: Set OpenDNS DNS Server

How do I set OpenDNS DNS server under Ubuntu Linux desktop operating systems by editing configuration files?

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What Is Round Robin DNS?

Explains round robin DNS server, and how it works under UNIX / Windows / Linux / BSD operating systems.

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BIND 9: External: zone serial has gone backwards Error And Solution

I see the following error in my /var/log/messages file under Linux operating systems running BIND 9 master name server:

May 25 15:43:29 ns1 named[11794]: general: info: loading configuration from ‘/etc/named.conf’
May 25 15:43:29 ns1 named[11794]: general: info: using default UDP/IPv4 port range: [1024, 65535]
May 25 15:43:29 ns1 named[11794]: general: info: using default UDP/IPv6 port range: [1024, 65535]
May 25 15:43:29 ns1 named[11794]: general: error: the working directory is not writable
May 25 15:43:29 ns1 named[11794]: general: error: zone example.org/IN/external: zone serial has gone backwards
May 25 15:43:29 ns1 named[11794]: general: info: zone example.org/IN/external: loaded serial 2008090814
May 25 15:43:29 ns1 named[11794]: notify: info: zone example.org/IN/external: sending notifies (serial 2008090814)

How do I fix this problem under BIND 9 named server?

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What is Time To Live (TTL)?

Time to live (TTL) is used for computer data including DNS servers. It is nothing but time on the period of time or number of iterations or transmissions in computer and computer network technology that a unit of data (e.g. a packet) can experience before it should be discarded.

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What Is NXDOMAIN (Non-Existent Domain)?

A NXDOMAIN is Non-Existent Domain. It is a term used for the Internet domain name that is unable to be resolved using the DNS servers or domain name not yet registered. NXDOMAIN can also take place due to the network or DNS server problem.

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What Is Authoritative Name Server?

Explains Authoritative DNS Name Server – which provides actual answer to your DNS queries such as – mail server IP address or web site IP address (A resource record).

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