Create a monitor
The following sections describe how to create a monitor in Amazon CloudWatch Network Monitor, including the required probes. When you create a monitor, you specify probes by choosing source subnets, and then adding up to four destinations for each one. Each source-destination pair is a probe.
You can make changes to a monitor after you create it, for example, to add, remove, or deactivate probes. For more information, see Working with monitors and probes in Network Monitor.
You can work with monitors and probes by using either the Amazon CloudWatch console or the AWS Command Line Interface. To work with Network Monitor programmatically, see the Amazon CloudWatch Network Monitor API Reference and networkmonitor in the AWS Command Line Interface Command Reference.
The following procedures provide step-by-step instructions for how to create a monitor by using the Amazon CloudWatch console.
Important
These steps are designed to be completed all at once. You can't save in-process work to continue later.
Define monitor details
The first step to create a monitor is to define the basic details, by giving the monitor a name and defining the aggregation period. Optionally, you can also add tags.
To define monitor details
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Open the CloudWatch console at https://console.aws.amazon.com/cloudwatch/
, and then, under Network Monitoring, choose Network Monitor. -
Choose Create monitor.
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For Monitor name, enter a name for the monitor.
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For Aggregation period, choose how often you want to send metrics to CloudWatch: 30 seconds or 60 seconds.
Note
A shorter aggregation period provides faster detection of network issues. However, the aggregation period that you choose can affect your billing costs. For more information about pricing, see the Amazon CloudWatch pricing
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(Optional) For Tags, add Key and Value pairs to help identify this resource, so that you can search or filter on specific information.
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Choose Add new tag.
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Enter a Key name and associated Value.
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Choose Add new tag to add the new tag.
You can add multiple tags by choosing Add new tag, or you can remove a tag by choosing Remove.
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If you want to associate your tags with the probes for the monitor, keep Add tags to probes created by monitor selected. This adds the tags to the monitor probes, which can be helpful for tag-based authentication or metering.
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Choose Next. On the next page, you'll specify sources and destinations, to create probes for the monitor.
Choose sources and destinations
For each monitor in Network Monitor, you specify one or more probes, which are a combination of an AWS source and a destination.
A source for a probe is a VPC and associated subnets (or just a VPC subnet) in the Regions where your network operates.
A destination is the combination of on-premises IP addresses, network protocols, ports, and network packet size.
Important
These steps are designed to be completed all at once. You can't save in-process work to continue later.
To choose sources and destinations
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Prerequisite: Define monitor details.
Under AWS network source, choose one or more subnets to include in the monitor. To choose all subnets within a VPC, choose the VPC. Or, choose specific subnets within a VPC. The subnets that you choose are the monitor sources.
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For Destination 1, enter a destination IP address of the on-premises network. IPv4 and IPv6 addresses are both supported.
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Choose Advanced settings.
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For Protocol, choose the network protocol for the on-premises destination. The protocol can be either ICMP or TCP.
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If you choose TCP, enter the following information:
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Enter the Port that your network uses to connect. The port must be a number from 1 to 65535.
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Enter the Packet size. This is the size, in bytes, of each packet that's sent on the probe, between the source and destination. Packet size must be a number from 56 to 8500.
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Choose Add destination to add another on-premises destination to the monitor. Repeat these steps for each destination that you want to add.
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When you're finished adding sources and destinations, choose Next to confirm the probes for the monitor.
Confirm probes
On the Confirm probes page, review all the probes that will be created for the monitor, to make sure that they're the correct set of sources and destinations.
The Confirm probes page shows all the possible combinations of the sources and destinations for the probe specifications that you provided in the previous step. For example, if you have six source subnets and four destination IP addresses, there are 24 possible probe combinations, so 24 probes will be created.
Important
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These steps are intended to be completed in one session. You can't save in-process work to continue later.
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The Confirm probes page does not indicate whether a probe is valid. We recommend that you review this page carefully, and then delete any probes that aren't valid. You might be charged for probes that aren't valid if you don't remove them.
To confirm monitor probes
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Prerequisite: Choose sources and destinations.
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On the Confirm probes page, review the list of source and destination probe combinations.
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Choose any probes that you want to remove from the monitor, and then choose Remove.
Note
You are not prompted to confirm deleting a probe. If you delete a probe and want to restore it, you must set it up again. You can add a probe to an existing monitor by following the steps in Add a probe to a monitor.
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Choose Next, and then review the monitor details.
Review and create monitor
The final step is to review the details of the monitor and the probes for the monitor, and then create the monitor. You can change any information about the monitor at this point.
When you have finished reviewing and updating any information that isn't correct, create the monitor.
As soon as you create the monitor, Network Monitor begins tracking metrics and you'll start being charged for probes in the monitor.
Important
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This step is intended to be completed in one session. You can't save in-process work to continue later.
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If you choose to edit a section, you must step through the process to create a monitor from the point that you make the edits. Earlier monitor creation pages maintain the information that you already entered.
To review and create a monitor
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On the Review and create probes page, choose Edit for any section where you want to make changes.
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Make changes in that section, and then choose Next.
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When you're finished making edits, choose Create monitor.
The Network Monitor page displays the current state of monitor creation in the Network monitors section. While Network Monitor is creating the monitor, the State is Pending. When the State changes to Active, you can view CloudWatch metrics in the monitor dashboard.
For information on working with the monitor dashboard, see Network Monitor dashboards.
Note
It can take several minutes for a newly-added monitor to begin collecting network metrics.
