New Question
PRTG Network Monitor

Intuitive to Use.
Easy to manage.

300.000 administrators have chosen PRTG to monitor their network. Find out how you can reduce cost, increase QoS and ease planning, as well.

Download >>


What is this?

This knowledgebase contains questions and answers about PRTG Network Monitor and network monitoring in general. You are invited to get involved by asking and answering questions!

Learn more


Top Tags

View all Tags

Sensor dependencies: Child sensor will only be monitored if Parent sensor is down.



Your Vote:



I have a leased line (L/L) to monitor. It has an ISDN Dial Up line as backup. When the L/L is down, the ISDN link will be activated automatically.

At any one time, either one will be up i.e. L/L Up, ISDN Down, L/L Down, ISDN Up.

How do I configure sensor dependency whereby the child sensor (ISDN) will only be monitored when the parent (L/L) sensor is DOWN. When the parent sensor (L/L) goes back UP, the child sensor (ISDN) will be paused.

child-sensor dependencies parent-sensor prtg

Created on Apr 2, 2010 6:54:03 AM by  Chuah Chong Cheah (0) 1

Last change on Apr 6, 2010 7:19:22 AM by  Daniel Zobel [Product Manager]

1 Reply

Accepted Answer



Your Vote:



Dependencies only work on a "pause a sensor/object if dependency sensor is down" basis, see: Dependencies Concept

You may want to rethink your concept. Why not use two PING sensors with a short interval and monitor the first hops "behind" your data lines. These could control your other sensors.

Created on Apr 3, 2010 1:54:21 PM by  Dirk Paessler [Founder Paessler AG] (10,932) 3 4

Last change on Apr 6, 2010 7:16:33 AM by  Daniel Zobel [Product Manager]

Please log in or register to enter your reply.

Disclaimer: The information in the Paessler Knowledge Base comes without warranty of any kind. Use at your own risk. Before applying any instructions please exercise proper system administrator housekeeping. You must make sure that a proper backup of all your data is available.