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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).
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.
Links
The Links page shows all the links in your environment.
Configure a link
The Links page lets you configure 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.
    - Nodes
      The Nodes page lets you view all the network nodes in your environment and perform actions on them.
    - Links
      The Links page shows all the links in your environment.
      - Link events
        Link events are shown in a graphical format.
      - Link availability
        A history of events is stored for each link.
      - Configure a link
        The Links page lets you configure links.
      - Show alerts for a link
        The Links page lets you show alerts for a selected link.
      - Show requested traces for a link
        The Links page lets you show requested traces for a selected link.
      - Request a trace for a link
        The Links page lets you request a trace for a selected link.
      - Show events for a link
        The Links page lets you show requested traces for a selected link.
      - Show captured URLs for a link
        The Links page lets you show captured URLs for a selected link.
      - Manage learning for a link
        The Links page lets you manage the learning for a selected node.
      - Navigate from a link
        The Links page lets you navigate to related entities from a selected node.
    - Physical links
      The Physical links page lets you view all the physical links in your environment and perform actions on them. Smart Polling captures and displays the physical connections between the nodes in the physical graph. For switches, the graph also shows the physical port that maps each connection.
    - Sessions
      A session is established at a certain point in time, and later turned down. An established communication session might involve more than one message in each direction.
    - Traffic
      The Traffic page shows charts with information about throughput, protocols, and open transmission control protocol (TCP) connections.
    - Details page
      The details page lets you view more detailed information for a network.
  - Graph
    The Graph pages gives a graphical representation of the nodes in the environment.
  - 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.
  - 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 a link

The Links page lets you configure 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 shows.
Optional: To raise an alert when a new transmission control protocol (TCP) handshake is detected on the link, select Is persistent.
Optional: To raise an alert when a TCP SYN packet is detected on the link, select Alert on SYN.
Optional: To notify the link events when the link communication is interrupted or resumed., select Track availability (seconds) and enter a value.
Optional: To raise an alert when the link becomes inactive for more than the specified number of seconds, select Last activity check (seconds) and enter a value.
Select Save.

Results

The link has been configured.