![]() ![]() Around half of the time, it’s just the one person who cries wolf that’s having issues-typically solvable with some browser troubleshooting techniques. “Is anyone else’s internet not working?” is the modern office’s equivalent to pulling the fire alarm in a high school-the quickest way to cause hell to break loose. To help calm the nerves, here are some tips for resolving DNS issues. That’s why messages such as “DNS server not responding”, “DNS Server Unavailable” or “Server DNS Address could not be found” can bring on panic attacks. We’ve grown accustomed to having access without interruption. There’s more redundancy, and resources are more distributed. ![]() Free Tier also includes several “Always Free” services that are available for an unlimited time, even after your credits expire.Today’s internet is more resilient than it was even five years ago. If you want to try this lab for yourself, check out Oracle Cloud’s Free Tier with US$300 credits for a 30-day free trial. ![]() This blog provided one solution for configuring DNS for a client-to-site VPN using an OpenVPN access server running in your Oracle Cloud Infrastructure network. Properly setting up DNS within your private network and any connected networks is important because it allows you to use human-readable names instead of IP addresses and makes adding and removing servers seamless. Just as public DNS is essential for accessing public sites, private DNS is essential to access your company’s internal sites. You can resolve your OCI private zone while still being able to resolve public DNS! Conclusion In this example, 216.146.35.35 is one of Oracle’s public DNS servers, but any public DNS server can suffice. The expected behavior changes to the following options: With this ideal setting, you can now specify the DNS listener endpoint created for your zone as the primary DNS server and then a public DNS server as secondary. So, the default expected behavior has the following details:Ĭhanging the DNS settings to “Have clients use specific DNS servers” allows you to specify DNS servers for the VPN clients to use. Consequentially, nothing on the DNS side changes. With the default option, “Do not alter clients’ DNS server settings,” internet traffic is not routed through the VPN and the access server doesn’t push DNS servers to the client. A forwarding endpoint allows the resolver to query a remote DNS as defined by forwarding rules. A listening endpoint allows the resolver to answer DNS queries from outside the VCN. Private DNS resolver endpoints: Comes in two options. Private DNS zones: Contains DNS data only accessible from within a VCN, such as private IP addresses has similar capabilities to an internet DNS zone but provides responses only for clients that can reach the VCN As a starting point for private DNS in OCI, I recommend reading this blog on common private DNS scenarios. This blog doesn’t cover setting up OpenVPN, but for details, refer to links at the end of this blog. Best of all, the OpenVPN Access Server is free to install and use for two simultaneous VPN connections. In OCI OpenVPN is a powerful and easy-to-use enterprise VPN with a simple and friendly licensing model based on active VPN connections. Many client-to-site VPN appliances are available, but this blog focuses on using OpenVPN. The client is typically a single laptop with no network behind it. It usually uses N-to-1 configurations, with N clients connecting to one server. It typically uses 1-to-1 configurations where both sides have a network behind them.Ĭlient-to-site: Also known as remote access, client-to-site is a single user cconnection to a network. Site-to-site: Also known as a gateway-to-gateway, site-to-site is a connection between entire networks. VPN connections have the following main categories: Plenty of documentation for configuring DNS between VCNs and other private networks exists, but in this blog, I walk through achieving DNS resolution with OpenVPN, a popular client-to-site VPN solution offered on the Oracle Cloud Marketplace. We recommend properly configuring DNS when connecting networks to allow proper resolution between all devices. However, companies often have multiple remote users or don’t have a corporate network at all and require client-to-site connections to their VCNs. Oracle Cloud Infrastructure (OCI) provides complimentary site-to-site IPSec VPNs to your OCI networks, called virtual cloud networks (VCNs). ![]()
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