.. _node-updown-status:

Configuring Node Network Connection Health Checks
==============================================================================
Genian ZTNA an check node network connection status utilizing the Network sensor
Collected note connection status information can used by Network usage trends and Node group's Criteria


.. note:: Min Period is set as default for Node health check method. 

#. Go to **system** in the top of panel
#. Go to **System > System** in the left System Management panel
#. Find the **Network Sensor** and click **CheckBox** (multiple choice available)
#. Click **Tasks > Edit Appliance Settings**
#. Find **Miscellaneous> Whether to check node status** 
#. Click **CheckBox** and select **ON**
#. Find **Node health check method** and choose **Status Scans period** 
#. Click ``Run``


Genian ZTNA Node health check method
-------------------------------------------------------------------------------------------------------

Genian ZTNA Node health check method is listed below:

.. list-table::
   :widths: 3 10 12
   :header-rows: 1

   * - Method
     - Description
     - Recommendations
   * - Min Period
     - Set the period for sending ARP Request to perform node health check
     - Recommend to configure for managing Class C Network Sensor
   * - Number of Count
     - Set the number of sending ARP Request to perform node health check
     - Recommend to configure for managing Class C Network Sensor

1. Min Period option process flow
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This guide decribes the Min Period process flow based on default setting of Scan Period 15 second(s).

.. list-table::
   :widths: 3 10 12
   :header-rows: 1

   * - Sequence
     - Process
     - Description
   * - 1
     - Check ARP packets from node to network sensor for the first 120 seconds (2 minutes)
     - Keep node status UP, if ARP packets received
   * - 2
     - The network sensor sends an ARP Request to the node during the inspection time of 180 seconds (3 minutes)
     - Keep node status UP when node response occurs within 12 (180/15)
   * - 3
     - Change the node state to DOWN if there are no packets or responses within 300 seconds (5 minutes)
     - ARP requests are not sent to nodes once they are marked as down

2. Number of Count process flow
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''

This guide decribes the Number of Count process flow based on default setting of Scan times 256.

.. list-table::
   :widths: 3 10 12
   :header-rows: 1

   * - Sequence
     - Process
     - Description
   * - 1
     - Check ARP packets from node to network sensor for the first 120 seconds (2 minutes)
     - Keep node status UP, if ARP packets received
   * - 2
     - The network sensor sends an ARP Request to the node during the inspection time of 180 seconds (3 minutes)
     - All nodes are checked every 4 seconds(256/1024). And Keep node status UP when node response occurs within 45 (180/4)
   * - 3
     - Change the node state to DOWN if there are no packets or responses within 300 seconds (5 minutes)
     - ARP requests are not sent to nodes once they are marked as down