Fluke Computer Accessories Enabling NetFlow on an Enterasys Device, set netflow cache enable

User’s Guide – version 3.5 NetFlow Tracker

To ensure that NetFlow Tracker receives enough information from the device you must ensure that the “Look Community String” configured in the “SNMP” page is one of those set up in SNMP Settings, and you must set “Packeteer-0 Packets” to “on” in the “system variables” page.

If you have a recent version of PacketWise, you may have extra settings on the “system variables” page that should be changed. If available, “Intermediate FDR” should be set to “on”, “Intermediate FDR Timeout “ to 30000 milliseconds, and “Reset Packeteer 1/2 counters” to “on”. If these settings are not available then the PacketShaper will describe all of the traffic for a long-lived flow in one record, and NetFlow Tracker will account for it all in the minute during which the flow ended. This will lead to large spikes in charts for the device.

Enabling NetFlow on an Enterasys Device

NetFlow Tracker supports Enterasys devices capable of exporting NetFlow version 9 exports. To enable NetFlow, enter the following commands while logged in to the router with read/write access:

set netflow cache enable

This enables NetFlow.

set netflow export-destination <address> 2055

Use the address of your NetFlow Tracker machine and one of the ports configured in the Listener Ports settings page. Port 2055 is monitored by default.

set netflow export-interval 1

This breaks up long-lived flows into one-minute segments.

set netflow port <port-string> enable

You need to enable NetFlow on each interface through which traffic you are interested in will flow. This will normally be the Ethernet and WAN interfaces.

set netflow export-version 9

This sets the export version. Version 9 is required for NetFlow Tracker to be able to associate NetFlow information with the interfaces it relates to.

84