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Home > Success Center > Network Performance Monitor (NPM) > NPM - Knowledgebase Articles > NPM server requests promiscuous mode from the ESXi server

NPM server requests promiscuous mode from the ESXi server

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Updated July 18, 2017

Overview

This article describes why the NPM server is requesting promiscuous mode from the ESX server where it is hosted.

Environment

All NPM versions

Detail

 

Promiscuous mode is a security policy which can be defined at the virtual switch or portgroup level in vSphere ESX/ESXi. A virtual machine, Service Console or VMkernel network interface in a portgroup which allows use of promiscuous mode can see all network traffic traversing the virtual switch. Promiscuous mode is where NIC passes all received traffic to the CPU instead of passing only the frames that the CPU requested to receive.

Placing the guest's network adapter in promiscuous mode causes it to receive all frames passed on the virtual switch that are allowed under the VLAN policy for the associated portgroup. This can be useful for when a sniffer needs to analyze all traffic on the network segment. Solarwinds applications include Netpath & Qoe which require WinPCap to be installed in order to be able to collect the statistics which are used for monitoring purposes.

If you are to disable this mode you will impact the ability of Netpath or QoE to work as expected.

 

 

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