What are NS Records?
NS Records indicate which name servers are authoritative for the domain. NS Records are used in the event that another external DNS provider will be used in conjunction with Constellix DNS. They can also be used if a sub domain delegation will take place to external name servers. In most cases, no NS records need to be added for a domain as Constellix DNS defines the Constellix name servers under the system NS records section.
Video Tutorial: How to Add, Edit, and Delete Records
NS Record Fields
|Name||This will be the host name for the record, typically a computer or server within your domain. It is important to note, the domain name is automatically appended to the “Name” field of the record. For example, defining sub.example.com in DNS would be creating an A record with the name field of “sub” within the example.com domain. If the “Name” field is left blank, it represent the root record of the domain. The root record for the base domain can also be referred to as the apex record and is represented in a @ symbol in some documentations.|
|Value||This will be the host name for the name server, for example ns0.nameserver.com. It is important to note, the domain name is automatically appended to the end of this field unless it ends with a dot (.).|
|TTL||The TTL (Time to Live) in seconds is the amount of time the record will cache resolving name servers and in web browsers. The longer the TTL the less frequent remote systems will lookup the DNS record and the less query traffic the domain receives. The shorter the TTL the faster DNS changes propagate in servers that have cached data, however the higher the volume of query traffic the domain receives.
Typically NS records should have a higher TTL as they are static values which receive a high volume of queries. A TTL of 86400 is recommended for NS Records.
Records configured with Failover or that change often should have TTL’s set anywhere from 180 to 600 (3 to 10 minutes cache).
Records that are static and don’t change often should have TTL’s set between 1800 (being on the low end) to 86400 seconds (30 minutes to 1 day cache).
If a change is needed for a record with a high TTL, the TTL can be lowered prior to making the change and then raised back up again after.
ADD AN NS RECORD
4. Enter a name for the record and edit the default TTL if needed. Enter the Host Name of the target name server. Please note, the value field must end with a dot (.) to keep the example.com domain from being appended to the end of the value. The notes section lets you add a helpful note about this record if you wish. Click Save and Close.
A) Name: In this screen, you will add the record information. Follow the steps below:
B) TTL: Edit the TTL. Time to Live is measured in seconds and is the amount of time the record will cache in resolving name servers and web browsers.
C) Host: This is the hostname of the target name server. Please note, the value field must end with a dot (.) to keep the example.com domain from being appended to the end of the value.
D) Note: Add a helpful note with keywords so you can search for your records later.
E) Save and Close: Save your changes. Don’t forget to commit your changes.
Information on the NX Domain feature can be found in the Disabling a Record tutorial.
EDIT AN NS RECORD
3. Under the NS Records section, select a record by clicking the check mark next to it, then click the icon to edit a record.
Please note, you can not edit a record that has not been committed following its creation.
DELETE AN A RECORD
3. Under the NS Records section select a record by clicking the check mark next to it, click the icon to delete a record.
Please note, you can not delete a record that has not been committed following its creation.
4. The record will now show as strike through text, and is now in the queue of changes to be committed.