About Dns probe
LANIf you run PRTG as a cluster and you want to run remote probes outside your local network, you must make sure that your cluster nodes and the addresses that they use are reachable from the outside. Check your cluster node settings under Cluster before you install a remote probe outside your local network. Enter valid Domain Name System (DNS) names or IP addresses for both cluster nodes to reach each other and for remote probes to individually reach all cluster nodes. Remote probes outside your LAN cannot connect to your cluster nodes if they use local addresses.If you already have a remote probe installed outside your LAN and the remote probe is disconnected because of this, follow these steps:Uninstall the remote probe.Update the cluster node settings with addresses that are reachable from outside your LAN.Restart the PRTG core servers.Install the remote probe again. It then obtains the IP address or DNS name entries that it can reach.See also section Failover Cluster Configuration, section Remote Probes in a Cluster.Step 3: Configure the Failover NodeIf you have not yet done so, add a device that represents the target system on which you want to install the remote probe. Set the correct Windows credentials for this device.Open the device settings.In the Credentials for Windows Systems section, provide Domain or Computer Name, User Name, and Password for the target system. You can also inherit the credentials from the settings of a parent object in the device tree.Make sure that this user account has administration rights on the target system.Step 4: Confirm the Failover NodeIn the device tree, open the context menu of the target device.Select Device Tools | Install Remote Probe to open the install dialog in a new window.This option is only available for devices on the local probe of PRTG Network Monitor.Remote Probe Installation DialogThe install dialog includes four sections:Experimental feature notice and short introductionDetails: Overview of the device like Device Name, Status, Priority, Parent Probe, Parent Group, and Sensors by Status.Prerequisites: Make sure that you meet the requirements listed here. If not, PRTG cannot start the installation process. Open requirements are highlighted in red.Installation Unable to Start Because Prerequisites Are Not MetStart Probe Installation: Time estimation for the installation and installation start buttonIf all prerequisites are met, you can install the remote probe on the target system by clicking Install Remote Probe on "[device name]". Wait until the process has
Key features of the Dns probe that are enabled through these drivers include:
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Failure to adjust the configuration of these solutions before employing the VAs may result in the complete ineffectiveness of the VAs and Umbrella. For more information, see Using Umbrella with an HTTP Proxy. Solutions include:Transparent HTTP/HTTPS ProxyStandard/Caching HTTP/HTTPS ProxyContent Filtering via a hardware applianceDNSCryptThe VA supports DNSCrypt between itself and the Cisco public DNS resolvers (Umbrella). This means any information contained in the EDNS packets forwarded from the VA are encrypted by DNSCrypt and cannot be intercepted. For optimum protection, this feature is enabled by default.Unencrypted traffic is considered a problem that should be resolved. When encryption cannot be established between your VA and the Cisco DNS service, your dashboard displays a warning. Encryption is established with a probe sent on port 53 (UDP/TCP) to 208.67.220.220 and 208.67.222.222 and if you have a firewall or IPS/IDS doing deep packet inspection and expecting to see only DNS traffic, the probe may fail. If the probe fails, it is retried on 443 (UDP/TCP) and then on 5353 (UDP). In other words, the encrypted packets may not match the expected traffic on that port. Review your firewall configuration if that is the case and open a case with Support if you believe that you are allowing this traffic.Introduction < Prerequisites > Deployment Guidelines" data-testid="RDMD">Virtual Appliance RequirementsNetworking RequirementsDNSCryptTwo virtual appliances (VAs) per Umbrella site—VAs must be deployed in pairs to ensure redundancy at the DNS level and to allow for updates without downtime.VA Specifications—At a minimum, each VA requires the following allocated resources:One virtual CPUMinimum 512MB of RAM (1GB RAM recommended)7GB of disk space.Each VA is able to process millions of DNS requests per day using these specifications. If you believe your network will exceed this number, see Sizing Guide.🚧ImportantHigh-traffic site VAs should use two virtual CPUs and 2048MB of RAM per VA.A high-traffic site is one that has more than 500 DNS queries per second coming from the overall network.Download a fresh image for each deployment—You need to download a fresh image from Umbrella for each deployment, and when there is a new version. For security reasons, Umbrella periodically changes the Org Token Secret, requiring you to use an image less than 24 hours old. Also, the Virtual Appliance may not register correctly with the Umbrella dashboard if you are using an older version. See, Umbrella Virtual Appliance and Active Directory Connector: Download and deploy.Correct Date/Time—Ensure your hypervisor host has the correct date
