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When a Distributed Cloud Firewall (DCF) rule attempts a DNS match because of the included DNS Hostname SmartGroup, the Aviatrix Default DNS server is used to resolve the DNS, unless you configure a custom DNS Server.
You should select the DNS server to use before adding a DNS Hostname SmartGroup to a DCF rule.
To select a DNS server:
  1. In Aviatrix PaaS, go to Groups > Settings.
  2. Select one of the following on the DNS Server for Hostname Resolution card:
  • Gateway’s Management DNS Server: This is the Aviatrix default DNS server.
  • Custom DNS Servers: Enter one or more custom DNS server addresses (maximum is two) that will be updated for all enforcing gateways.
Ensure the correctness of the custom DNS server addresses before saving. Any valid IP address is accepted by this field, even if it is not the IP address of a DNS server.
  1. Click Save.