DNS

Default DHCP: Internal DNS

  • The VCN Private Domain Name System (DNS) enables instances to use hostnames instead of IP addresses to talk to each other.


Options for DNS

  • Internet and VCN Resolver: default choice for new VCN
  • Custom Resolver: lets instances resolve the hostnames of hosts in your on-premise network through IPsec VPN/Fastconnect.
  • Optional specify DNS label when creating the VCN/subnets/instances
    • VCN: <VCN DNS label>.oraclevcn.com
    • Subnet: <subnet DNS label>.<VCN DNS label>.oraclevcn.com
    • Instance FQDN: <hostname><.subnet DNS label>.<VCN DNS label>.oraclevcn.com
  • Instance FQDN resolves to the instance’s private IP address.
  • No automatic creation of FQDN for public IP addresses. Cannot use outside the OCI network, for example: cannot ssh using the hostname.subnet DNS label.VCN DNS label.oraclevcn.com.

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