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How can I monitor a DHCP server in a specific network if there are several DHCP networks?



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On the computer running the probe with my DHCP sensors are several network adapters. Each adapter is connected to another network with a DHCP server in each network. When I add one DHCP sensor to each available NIC, all sensors only show the network to which the first adapter is connected.

Why does not send PRTG the DHCP request via the NICs to which I add the sensors so that one DHCP sensor gets the response from one specific DHCP server? What can I do to monitor several DHCP networks via several network adapters on one probe system?

dhcp dhcp-sensor nic prtg remote-probe

Created on May 20, 2015 5:13:54 PM by  Gerald Schoch [Paessler Support]

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This article applies to PRTG Network Monitor 14 or later

Monitoring DHCP Servers in Different Networks

Although the DHCP sensor connects to a specific network card, the probe on which the sensor runs is responsible to get a DHCP based IP address via the DHCP request. For this purpose, the probe server uses any available NIC. Because of this, DHCP sensors only show the DHCP server that sends the first response. The sensors monitor all NICs on which you create them, but they all get the response from the same DHCP server in this case. It is not possible to restrict this sensor type to send the DHCP request to only one specific connected network.

To monitor a specific DHCP network if you have more than one, add a remote probe to each desired network and create the sensors on the corresponding probe devices. If you do so, you can monitor each DHCP server individually.

Created on May 20, 2015 5:14:45 PM by  Gerald Schoch [Paessler Support]

Last change on May 21, 2015 3:24:45 PM by  Martina Wittmann [Paessler Support]

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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.