View source for The DNS

<span data-link_translate_en_title="The DNS"  data-link_translate_en_url="The DNS"></span>[[:en:The DNS]][[en:The DNS]]
<span data-link_translate_ja_title="DNS"  data-link_translate_ja_url="DNS"></span>[[:ja:DNS]][[ja:DNS]]
<span data-link_translate_zh_title="DNS"  data-link_translate_zh_url="DNS"></span>[[:zh:DNS]][[zh:DNS]]
<span data-link_translate_de_title="Das DNS"  data-link_translate_de_url="Das+DNS"></span>[[:de:Das DNS]][[de:Das DNS]]
<span data-link_translate_he_title="ה-DNS"  data-link_translate_he_url="%D7%94-DNS"></span>[[:he:ה-DNS]][[he:ה-DNS]]
<span data-link_translate_ro_title="DNS"  data-link_translate_ro_url="DNS"></span>[[:ro:DNS]][[ro:DNS]]
<span data-link_translate_ru_title="DNS"  data-link_translate_ru_url="DNS"></span>[[:ru:DNS]][[ru:DNS]]
<span data-link_translate_pl_title="DNS"  data-link_translate_pl_url="DNS"></span>[[:pl:DNS]][[pl:DNS]]
<span data-link_translate_ar_title="نظام أسماء النطاقات"  data-link_translate_ar_url="%D9%86%D8%B8%D8%A7%D9%85+%D8%A3%D8%B3%D9%85%D8%A7%D8%A1+%D8%A7%D9%84%D9%86%D8%B7%D8%A7%D9%82%D8%A7%D8%AA"></span>[[:ar:نظام أسماء النطاقات]][[ar:نظام أسماء النطاقات]]
<span data-link_translate_nl_title="De DNS-server"  data-link_translate_nl_url="De+DNS-server"></span>[[:nl:De DNS-server]][[nl:De DNS-server]]
<span data-link_translate_it_title="Il DNS"  data-link_translate_it_url="Il+DNS"></span>[[:it:Il DNS]][[it:Il DNS]]
<span data-link_translate_pt_title="O DNS"  data-link_translate_pt_url="O+DNS"></span>[[:pt:O DNS]][[pt:O DNS]]
<span data-link_translate_es_title="El DNS"  data-link_translate_es_url="El+DNS"></span>[[:es:El DNS]][[es:El DNS]]
<span data-link_translate_fr_title="Le DNS"  data-link_translate_fr_url="Le_DNS"></span>[[:fr:Le DNS]][[fr:Le DNS]]
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{{#seo:
    |title= DNS server
    |titlemode=replace
    |keywords=DNS server
    |description=A Server DNS provides the DNS service by definition. Most internet service providers /Web hosts provide a DNS service with recursion.
    |og:type=article
    |og:image=https://en-wiki.ikoula.com/resources/assets/logo_ikwiki.png
    
    }}

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==Description ==
The most common use of a DNS is to match a  {{Template:Domaine}} to an IP address. It would be possible to navigate using addresses IP, but this would be less user friendly.

To contact a site, there is a resolution of  {{Template:Domaine}} What translates the ip address.

==The  {{Template:Serveur}}s DNS ==
A  ''''{{Template:Serveur}} DNS''' provides the ''DNS'' service by definition. Most internet service providers /Web hosts provide a DNS service with recursion.

Following the reservation of a name of  {{Template:Domaine}}, you will need a  {{Template:Serveur}} DNS where its DNS zone is registered. We are talking about in this case of  {{Template:Serveur}} name  (NS).

==DNS recursion ==
When a  {{Template:Serveur}} DNS is queried for the resolution of a name of  {{Template:Domaine}} what he doesn't know, he asks another  {{Template:Serveur}} DNS for resolution. He kept this information in its cache.
<div style="background-color: #FF9999;"> '''Attention''': DNS recursion can be diverted to make the 'DDOS DNS amplification'. It must therefore allow the use of this service only to trusted clients.  </div>

==Server NS ==
It comes from  {{Template:Serveur}}s that contain a DNS zone  {{Template:Domaine}}. These  {{Template:Serveur}}s are declared responsible for the first level of the extension register  (.fr, .com...).

====How to determine the  {{Template:Serveur}}s NS a DNS zone ====
For example we want to determine this for   "'ikoula.wiki"'.
As a first step consult a  {{Template:Serveur}} DNS root to determine what  {{Template:Serveur}}s ''DNS'' contain extensions area "'.wiki ' '  :

<pre>
$ dig -t NS wiki @a.root-servers.net

;; AUTHORITY SECTION:
wiki.                   172800  IN      NS      a.nic.wiki.
wiki.                   172800  IN      NS      b.nic.wiki.
wiki.                   172800  IN      NS      c.nic.wiki.
wiki.                   172800  IN      NS      d.nic.wiki. 
</pre>

Then he must consult the DNS of the extension to determine what are the  {{Template:Serveur}}s of our domain  :

<pre>
$ dig -t NS ikoula.com @a.nic.wiki

;; AUTHORITY SECTION:
ikoula.com.             172800  IN      NS      ns4.ikoula.com.
ikoula.com.             172800  IN      NS      ns5.ikoula.com.
</pre>

===The main type of DNS records ===

====SOA ====
The registration of type SOA  (Start Of Authority ) contains several important as information the  {{Template:Serveur}} NS primary, contact e-mail address, and the serial.

====A====
Records of type A  (for host address ) are mappings between a host name and an address IPv 4.

====YYYY ====
Records of type yyyy are the mappings between a host name and an address IPv 6.

====CNAME ====
Records of type CNAME  (Canonical NAME or CNAME ) are mappings between a host name and a different host name. It helps to have the same IP match the hostname defined in value.
Define a CNAME at the root of a DNS zone is not permitted.

====MX ====
The record type   MX (Mail eXchanger ) sets the host name of  {{Template:Serveur}} Messaging and a priority.
When multiple MX records are present in the same area, the MX with the lowest priority takes precedence. If the  {{Template:Serveur}} Priority MX is faulty, the  {{Template:Serveur}} With the lowest priority MX which is non lacking is used.

====NS====
Records of type NS  (Server name or  {{Template:Serveur}} name ) identify the  {{Template:Serveur}}s DNS from the DNS zone. One of them must be the primary and is set in the SOA record, but the entirety of  {{Template:Serveur}}s NS of a DNS zone must be reported to the responsible for the first level of the extension registry.
 
====TXT ====
The TXT record is used among other for  :

- validate the property of a site  ("' Example  : GoogleAnalytics ' ' ).

- define the  {{Template:Serveur}}Messaging s allowed to relay emails for your domain  (’’’SPF’’’)

- define a public key for the encryption of e-mail  ("'DomainKeys"' )

====SRV ====
Records of type SRV  (service) used to map a hostname to a given service type. Thus the SRV records can retrieve a list of  {{Template:Serveur}}s HTTP or domain controllers. It is possible to give different priority to every SRV record.

==The principle of DNS replication ==
The DNS change should be present on the  {{Template:Serveur}} NS primary.  

In order for this change replicates, the serial must be incremented.

So the  {{Template:Serveur}}s secondary NS recover the DNS on the primary NS zone, should be  :

- have a serial in the SOA in the primary ''DNS server'' of NS zone that is greater than the serial of the SOA of the zone on the secondary NS 

- only the  {{Template:Serveur}}s secondary NS are allowed on the  {{Template:Serveur}} primary to make zone transfer. This is a DNS AXFR query.

To verify that replication in many was effective there are different site, including  : '''whatsmydns'''
This allows to check the current status of the DNS propagation after changing names of  {{Template:Serveur}}s.
To do this, simply return the  {{Template:Domaine}} be desired in the field provided for this purpose.

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