What is this?

This knowledgebase contains questions and answers about PRTG Network Monitor and network monitoring in general.

Learn more

PRTG Network Monitor

Intuitive to Use. Easy to manage.
More than 500,000 users rely on Paessler PRTG every day. Find out how you can reduce cost, increase QoS and ease planning, as well.

Free Download

Top Tags

View all Tags

sFlow Sensor Filtering VLANs




We are monitoring the internal interface of our firewall (Fortigate 200B) with sFlow.

The internal interface of the firewall sits on a Management VLAN, which then passes traffic through to various businesses each on their own VLAN which are segregated from each other via ACLS.

The Management VLAN has access to all VLANs.

Set up like this, it works - we can see all traffic for all VLAN's.

However we want to be able to filter to see only traffic to/from a certain VLAN.

I think we are setting the Include Filter wrong - we have tried:

DestinationVLAN[13] IP[]

Once these are set, it stops collecting data. As soon as it is removed it works again.

What is the correct setting?

filter sflow vlan

Created on Apr 11, 2012 1:48:29 PM

1 Reply

Accepted Answer




it's very likely that in your old PRTG version the sflow-sensors do not support VLAN-functionality. This was implemented later on in PRTG, therefore please update your PRTG.

best regards.

Created on Apr 11, 2012 3:16:22 PM by  Torsten Lindner [Paessler Support]

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.