Private Domain Name System (DNS) serves a pivotal role in managing your internal resources within your Virtual Cloud Network (VCN). While resembling public DNS in function, private DNS operates exclusively within your private network, inaccessible from the internet. Let’s delve into its intricacies to grasp its significance.
Differentiating Private DNS
Private DNS mirrors public DNS in many ways but functions solely within your internal network. Unlike public DNS, which resolves domain names accessible over the internet, private DNS focuses on resolving domain names specific to your private resources. This segregation ensures that your internal network remains isolated from external access.
Introducing Split Horizon
A notable feature of private DNS is the concept of split horizon. This entails having the same domain accessible both privately within your network and publicly over the internet. For instance, you can configure private DNS for “example.com” to resolve within your VCN while simultaneously having a public DNS resolution for the same domain. This duality is what we refer to as split horizon.
Establishing Connectivity
Private DNS facilitates seamless connectivity between your on-premises resources and those hosted on OCI. This connectivity is achieved through the deployment of listeners and forwarders.
- Listeners: These components intercept requests originating from on-premises resources destined for OCI resources. Once identified, the listener routes these requests to the appropriate destination within your VCN.
- Forwarders: Conversely, forwarders are responsible for directing DNS requests from your OCI resources to on-premises DNS servers. This ensures bidirectional connectivity between your on-premises infrastructure and resources hosted on OCI.
Interconnecting DNS
Private DNS empowers you to seamlessly interconnect DNS services across your on-premises infrastructure and VCN. By configuring forwarders and listeners, you establish a robust communication channel between your internal resources and OCI-hosted assets.
Essential Components
In navigating the realm of private DNS within OCI, it’s crucial to acquaint yourself with its core components:
- Private DNS Zone: Defines the scope and resolution rules for domain names within your VCN.
- Private DNS Views: Allows for customized DNS resolution policies tailored to specific network segments or requirements.
- Private DNS Resolver: Acts as the central hub for managing DNS resolution within your VCN, providing granular control over DNS configurations.
Accessing Private DNS
Navigating to private DNS is straightforward within OCI. You can access it either through the DNS section of networking or directly from the subnet settings. By accessing the resolver, you gain entry to the comprehensive suite of tools and configurations offered by the private DNS console.
In conclusion, private DNS in OCI serves as a vital cog in the wheel of network management, enabling secure and efficient communication within your virtual infrastructure. By understanding its functionalities and components, you can harness its potential to streamline connectivity and bolster the resilience of your network architecture.