Overview

ICMP tests allow you to monitor the availability of your hosts and diagnose network communication issues. By asserting on the values received from one or more ICMP pings to your endpoint, Datadog can help detect connectivity issues, above-quota latency for round trip times, and unexpected changes in security firewall configuration. The tests can also track the number of network hops (TTL) required to connect to your host and view traceroute results to discover details on each network hop along the path.

ICMP tests can run from both managed and private locations depending on whether you want to trigger ICMP pings to your endpoints from outside or inside your network. You can run ICMP tests on a defined schedule, on demand, or from within your CI/CD pipelines.

Configuration

You may create a test using one of the following options:

• Create a test from a template:

  1. Hover over one of the pre-populated templates and click View Template. This opens a side panel displaying pre-populated configuration information, including: Test Details, Request Details, Assertions, Alert Conditions, and Monitor Settings.
  2. Click +Create Test to open the Define Request page, where you can review and edit the pre-populated configuration options. The fields presented are identical to those available when creating a test from scratch.
  3. Click Save Details to submit your API test.
     
     

• Build a test from scratch:

  1. To build a test from scratch, click the + Start from scratch template, then select the ICMP request type.
  2. Specify the Domain Name or IP address to run your test on.
  3. Select or deselect Track number of network hops (TTL). When selected, this option turns on a “traceroute” probe to discover all gateways along the path to the host destination.
  4. Select the Number of Pings to trigger per test session. By default, the number of pings is set to four. You can choose to decrease this number or increase it up to ten.
  5. Name your ICMP test.
  6. Add Environment Tags as well as any other tags to your ICMP test. You can then use these tags to filter through your Synthetic tests on the Synthetic Monitoring & Continuous Testing page.
  7. Click Test Host to try out the request configuration. A response preview is displayed on the right side of your screen.
     
     
  8. Click Create Test to submit your API test.

Snippets

When setting up a new Synthetic Monitoring API test, use snippets to automatically fill in basic auth, performance, and regions, rather than selecting these options manually. The following snippets are available:

• Basic Auth: Automatically test your APIs using pre-populated basic auth headers, JavaScript, bearer token, and API/app key auth variables.

• Performance: Automatically configure a test with the shortest frequency (one minute), perform a gRPC health check, and test for overall response time latency with a breakdown of network timing.

• Regions: Automatically test your API endpoint against a location in each of the three primary geographic regions (AMER, APAC and EMEA).
  
  

  

Define assertions

Assertions define what an expected test result is. After you click Test URL, basic assertions on latency, packet loss, and packet received are added. You must define at least one assertion for your test to monitor.

You can create up to 20 assertions per API test by selecting New Assertion or by selecting the response preview directly:

If a test does not contain an assertion on the response body, the body payload drops and returns an associated response time for the request within the timeout limit set by the Synthetics Worker.

If a test contains an assertion on the response body and the timeout limit is reached, an Assertions on the body/response cannot be run beyond this limit error appears.

Select locations

Select the Locations to run your ICMP test from. ICMP tests can run from both managed and private locations depending on your preference for triggering trigger the ICMP pings from outside or inside your network.

Datadog’s out-of-the-box managed locations allow you to test public-facing websites and endpoints from regions where your customers are located.

AWS:

GCP:

Azure:

The Datadog for Government site (US1-FED) uses the following managed location:

Specify test frequency

ICMP tests can run:

• On a schedule to ensure your most important services are always accessible to your users. Select the frequency at which you want Datadog to run your ICMP test.
• Within your CI/CD pipelines.
• On-demand to run your tests whenever makes the most sense for your team.

Define alert conditions

Set alert conditions to determine the circumstances under which you want a test to fail and trigger an alert.

Alerting rule

When you set the alert conditions to: An alert is triggered if any assertion fails for X minutes from any n of N locations, an alert is triggered only if these two conditions are true:

• At least one location was in failure (at least one assertion failed) during the last X minutes;
• At one moment during the last X minutes, at least n locations were in failure.

Fast retry

Your test can trigger retries X times after Y ms in case of a failed test result. Customize the retry interval to suit your alerting sensibility.

Location uptime is computed on a per-evaluation basis (whether the last test result before evaluation was up or down). The total uptime is computed based on the configured alert conditions. Notifications sent are based on the total uptime.

Configure the test monitor

A notification is sent by your test based on the alerting conditions previously defined. Use this section to define how and what to message your team.

1. Similar to how you configure monitors, select users and/or services that should receive notifications either by adding an @notification to the message or by searching for team members and connected integrations with the dropdown menu.

2. Enter the notification message for your test. This field allows standard Markdown formatting and supports the following conditional variables:

   Conditional Variable	Description
   {{ #is_alert }}	Show when the test alerts.
   {{ ^is_alert }}	Show unless the test alerts.
   {{ #is_recovery }}	Show when the test recovers from alert.
   {{ ^is_recovery }}	Show unless the test recovers from alert.
   {{ #is_renotify }}	Show when the monitor renotifies.
   {{ ^is_renotify }}	Show unless the monitor renotifies.
   {{ #is_priority }}	Show when the monitor matches priority (P1 to P5).
   {{ ^is_priority }}	Show unless the monitor matches priority (P1 to P5).

3. Specify how often you want your test to re-send the notification message in case of test failure. To prevent renotification on failing tests, leave the option as Never renotify if the monitor has not been resolved.

4. Click Create to save your test configuration and monitor.

For more information, see Using Synthetic Test Monitors.

Create local variables

To create a local variable, click + All steps > Variables. You can select one of the following available builtins to add to your variable string:

{{ numeric(n) }}

Generates a numeric string with n digits.

{{ alphabetic(n) }}

Generates an alphabetic string with n letters.

{{ alphanumeric(n) }}

Generates an alphanumeric string with n characters.

{{ date(n unit, format) }}

Generates a date in one of Datadog’s accepted formats with a value corresponding to the UTC date the test is initiated at + or - n units.

{{ timestamp(n, unit) }}

Generates a timestamp in one of Datadog’s accepted units with a value corresponding to the UTC timestamp the test is initiated at +/- n units.

{{ uuid }}

Generates a version 4 universally unique identifier (UUID).

{{ public-id }}

Injects the Public ID of your test.

{{ result-id }}

Injects the Result ID of your test run.

To obfuscate local variable values in test results, select Hide and obfuscate variable value. Once you have defined the variable string, click Add Variable.

Use variables

You can use the global variables defined on the Settings page in the URL and assertions of your ICMP tests.

To display your list of variables, type {{ in your desired field.

Test failure

A test is considered FAILED if it does not satisfy one or more assertions or if the request prematurely failed. In some cases, the test can fail without testing the assertions against the endpoint.

These reasons include the following:

DNS

DNS entry not found for the test URL. Possible causes include misconfigured test URL or the wrong configuration of your DNS entries.

Permissions

By default, only users with the Datadog Admin and Datadog Standard roles can create, edit, and delete Synthetic ICMP tests. To get create, edit, and delete access to Synthetic ICMP tests, upgrade your user to one of those two default roles.

If you are using the custom role feature, add your user to any custom role that includes synthetics_read and synthetics_write permissions.

Restrict access

Use granular access control to limit who has access to your test based on roles, teams, or individual users:

1. Open the permissions section of the form.
2. Click Edit Access.

3. Click Restrict Access.
4. Select teams, roles, or users.
5. Click Add.
6. Select the level of access you want to associate with each of them.
7. Click Done.

Further Reading

Additional helpful documentation, links, and articles:

Introducing Datadog Synthetic MonitoringBLOG Get started with API testsDOCUMENTATION Run ICMP pings on internal endpointsDOCUMENTATION Learn about Synthetic test monitorsDOCUMENTATION