This guide contains different information to help with editing your DNS zone.

DNS Overview

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Definition

The DNS (or Domain Name System) translates a domain name into an IP address (the actual location of your website), so that your requests can reach the target server.
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Differences between the DNS zone and DNS servers

DNS servers
  • DNS servers are the servers which have been assigned to a domain name. It is therefore these servers which respond first before handing over to the DNS zone.
DNS zone
-The DNS zone is a file that stores different records which specify the addresses of servers hosting your site (A), or your emails(MX). These addresses can be in the form of IP addresses or host names.
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Why edit servers or DNS zone?

DNS servers
It may be necessary to modify DNS servers when changing registrar. Indeed, some registrars do not allow you to continue using their servers after you have switched your domain name to a competitor .
It is also possible that you have a dedicated server which uses a DNS server, and you want to use this to manage your domain .
DNS Zone
When you want to modify the server hosting your website or emails following change of hos, for example, you have to modify your DNS zone. Once this is updated, your domain will point to these new servers.
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What factors affect propagation time?

The impact of TTL
TTL (Time to Live) is the time period for which servers cache the information for your DNS records.
At OVH, newly created DNS zones are set to one hour TTL. (TTL = 3600)

DNS zone modification

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Connecting to the customer account

  • Connect to your customer account with your nic-handle and password.

  • Click "Login" to confirm.
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Selecting a domain

  • In the left hand menu, select "Domains" then the domain you wish to modify.
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Consulting the DNS zone

Click on the "DNS Zone" in order to view your zone. Here you can see your different fields. You can also filter the display to make it easier.
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Modifying an entry

In order to modify an entry, just click on the penci icon, "Next" and then et "Confirm".
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Deleting an entry

In order to modify an entry, you have to click on the trash icon and then click confirm.
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Reset configuration

This button lets you reset your DNS zone configuration in order to rest all the fields by default.
Click on the type of zone which you want then click on "Confirm":

  • Minimal entries: This choice will provide a zone with minimal entries needed for your domain to work.

  • Reset as normal: This choice will provide you with additional entries, like CNAM for FTP, etc.
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Add an entry

This button let's you add a new field in your DNS zone.
You just have to choose the entry type and then click "Next".
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Modify in text mode

This button lets you edit your zone in text mode for advanced use.
This mode is useful for experienced users who want to carry out quick modifications.
You just have to modify the text zone and click confirm.
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Default TTL

This button lets you modify your DNS zone's TTL in order to manage time period in cache.
You just have to choose the TTL defaut that you want, and then click "Confirm".

Different types of DNS zone records

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A

A Records point your domain name to an individual server using an IP address
You cannot have a type A and a CNAME for the same host name.
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MX

MX Records point your domain name's email to its email provider.
Only a host name can be indicated, not an IP address
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CNAME

CNAMEs entry is used to create an alias for a host name to another host name.
Only a hostname can be specified, and not an IP address.
You cannot have a CNAME and an A record for the same host name.
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TXT

A TXT record allows you to insert a text into your DNS zone.
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SPF

An SPF record lets you specify the servers authorised to send email with yout domain name.
More information here:

Tools and options

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Check Zone

This tool lets you check that your DNS servers have updated successfullly.
See the following guide:
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DNSSEC

This option lets you protect your domain against Cache Poisoning.
A guide is available here:

Useful information

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Timings

DNS Servers
  • All DNS server modifications can take up to 49 hours.

DNS Zone
  • All DNS zone modifications can take up to 24 hours.