Configuring DNS Forwarder in NSX
1440 Ansichten
27.02.2023 
Cloud / VMware
Objective
You can use a DNS forwarder in NSX that centralises all DNS queries and redirects them to external DNS servers, which reduces network traffic. You can attach the DNS forwarder to the north-south gateway (ovh-T0-gw) or the east-west gateway (ovh-T1-gw), depending on your needs.
Discover how to configure a DNS forwarder.
OVHcloud provides services for which you are responsible, with regard to their configuration and management. It is therefore your responsibility to ensure that they work properly.
This guide is designed to assist you as much as possible with common tasks. However, we recommend contacting a specialist provider if you experience any difficulties or doubts when it comes to managing, using or setting up a service on a server.
Requirements
- Being an administrative contact of your Hosted Private Cloud infrastructure to receive login credentials
- A user account with access to the OVHcloud Control Panel
- You need to have NSX deployed with a segment configured in your NSX configuration. Use our guide on segment management in NSX for more information.
Instructions
We will create a DNS redirector and attach it to the north-south gateway (ovh-t0-gw), it will be usable on all segments of NSX.
DNS forwarder configuration
Through the NSX interface go to the Networking tab and click on DNS on the left in the IP Management section. Then click ADD DNS SERVICE.
Enter this information :
- Name : Your service name, such as
dns-forwarder. - Tier-0/Tier-1 Gateway : Your North-South gateway
ovh-T0-gw. - DNS Service IP : a private IP address not used in your segments, such as
192.168.200.1.
Next, click the three vertical dots below Default DNS Zone.
Click Add New Default Zone.
Fill in these values :
- Name : The name of the zone, such as
cdns.ovh.net. - DNS Servers : OVHcloud DNS server
213.186.33.99.
Then click SAVE.
Click SAVE.
Your DNS forwarder is active and usable on all your overlay or VLAN segments connected to your north-south gateway (ovh-t0-gw).
Editing the DHCP server to use a DNS forwarder
If you have configured DHCP servers in NSX as described in our Configuring DHCP guide, you have the option to modify the configuration to use the DNS forwarder in your DHCP configurations.
We will see how to modify the DNS server on the DHCP configuration of one of your segments.
Still from the Networking tab, click Segments on the left in the Connectivity section.
Then click on the three vertical dots next to your segment and choose Edit from the menu.
Click EDIT DHCP CONFIG.
Click the X to the right of the existing DNS in the DNS Servers option to remove it from the configuration.
Add your DNS redirector IP address in DNS Servers as 192.168.200.1 and click APPLY.
Click SAVE.
Click CLOSE EDITING.
Your segment's DHCP settings now use the DNS forwarder you created earlier.
Go further
VMware documentation on DNS in NSX
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Segmentverwaltung in NSX (EN)
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