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Guardian
Learn how Guardian provides comprehensive asset inventory and network visibility for OT and IoT environments.
User Guide
Information and resources about the main features of Guardian, and the tasks that you can do from the user interface (UI).
Assertions
The Assertions page shows all the assertions and lets you configure them.
Configure an assertion on links
This lets you configure the scope of the assertion for the related links.

Guardian
Learn how Guardian provides comprehensive asset inventory and network visibility for OT and IoT environments.
- Introduction
  An overview of Guardian.
- Installation Guide
  Information and resources on how to install Guardian, and the different options and settings that are available.
- Administrator Guide
  Information and resources about the Administration section of Guardian, and the tasks that you can do in this part of the software.
- User Guide
  Information and resources about the main features of Guardian, and the tasks that you can do from the user interface (UI).
  - Sensors
    The Sensors page lets you view all of the sensors that you have in your system.
  - Alerts
    The Alerts page shows all the latest alerts in the system. It lets you view the alerts in different modes, and carry out actions on the alerts.
  - Assets
    The Assets page shows all the physical components and systems in the local network environment and their associated details. It also lets you perform actions on those assets. Depending on the nodes and components involved, assets can range from a simple personal computer to an operational technology (OT) device.
  - Queries
    You can use the Nozomi Networks Query Language (N2QL) syntax to create complex data processes to obtain, filter, and analyze lists of information from the Nozomi Networks software.
  - Smart Polling in Guardian
    The Smart Polling page lets you view and manage Smart Polling.
  - Arc in Guardian
    Arc™ is a host-based sensor that detects and defends against malicious or compromised endpoints, and insider attacks. You can use Arc sensors to aggregate data for analysis and reports, either on-premises, or in the Vantage cloud.
  - Network
    The Network page gives you access to multiple pages that show nodes, links, sessions in tabular format and graphs and traffic in a graphical format.
  - Process
    Process is a set of repeatable functions that a business does to deliver a core value.
  - Reports
    The Reports page lets you manage, generate, schedule and view reports.
  - Assertions
    The Assertions page shows all the assertions and lets you configure them.
    - Assertion operators
    - Save an assertion
      You can save assertions to have them continuously executed in the system.
    - Edit an assertion
      This lets you edit the details for an existing assertion.
    - Configure an assertion
      This lets you configure the execution interval of the assertions, in seconds.
    - Configure an assertion on links
      This lets you configure the scope of the assertion for the related links.
    - Configure an assertion on variables
      This lets you configure the scope of the assertion for the related variables.
  - Time machine
    Time machine lets you load a snapshot, which is a previously saved state, and go back in time, to analyze the data from a past situation. You can load a single snapshot and use the platform as usual or load two snapshots and compare the user interface to highlight changes.
  - Vulnerabilities
    The Nozomi Networks software continuously discovers vulnerabilities in monitored assets.
  - Administration
  - Personal settings
    The personal settings page lets you do actions that are specific to your profile.
- Maintenance Guide
  Information about the maintenance tasks of Guardian, to help you administer and maintain the solution in a production environment.
- Print format documentation
  A list of all the print-format documentation that is available for Guardian.

Configure an assertion on links

This lets you configure the scope of the assertion for the related links.

Procedure

In the top navigation bar, select icon > Network.
The Network page opens.
Select Links.
The Links page opens.
To the left of the applicable link, select the configure icon.
A dialog opens.
Optional: Select Is persistent.

Note:
When selected, this check raises a new alert whenever a transmission control protocol (TCP) handshake is successfully completed on the link.
Optional: Select Alert on SYN.

Note:
When selected, this check raises a new alert whenever a client sends a TCP SYN on the link.
Optional: Select Track availability (seconds).

Note:
When selected, a link is considered non-functioning if it is unresponsive for the specified time.
Optional: Select Last activity check (seconds).

Note:
When selected, this check raises an alert when the link is not receiving data for more than the specified time.
Select Save.

Results

The assertion has been configured.