13.1. Trisul with Netflow
This section explains how you can setup Trisul in Netflow mode. In this mode, Trisul uses Netflow and other flow telemetry to drive its analytics engine instead of raw packets. This section describes how to configure Netflow mode, to analyze from a Device perspective, and how to use advanced features such as “Interface Tracking”.
13.1.1 Key Features of Trisul Netflow
Trisul supports Netflow v1, v5, and Netflow v9, Flexible Netflow, and all versions of SFLOW, and IPFIX. All routers and interfaces are auto discovered.
Bandwidth and Traffic Monitoring
Monitor bandwidth usage
Device and interface drilldown
Over 200 Metrics,TopN,BottomN
NO ROLL UPS
Full resolution metrics
LIVE Real Time views
Long term interface drilldowns
Flow Analytics for incident response
Store ALL flows
No rollups or loss of info
Drilldown flows from interfaces
Powerful Flow Query
Graph Analytics for Flows
Enrich withFlow Taggers
Long timeframe Top-K flows
Detect Exfil and Long Sessions
13.1.2 Introduction to Netflow for Trisul
Netflow is a very handy mechanism to acquire network data from a very large number of network elements in a cost effective manner. For maximum visiblity, we recommend you enable Netflow all over your network and send the logs to a Trisul context.
The following diagram shows an example deployment.
13.1.3 Advantages of Netflow vs Packet Capture
Trisul’s default input mode is raw packet capture. But Trisul also has comprehensive support for Netflow v5/v9/JFlow/IPFIX/and SFlow metering.
|advantages of netflow input||disadvantages|
|easier distributed deployment||no packet based traffic metering like DNS, HTTP, SSL analysis,etc|
|less expensive hardware||limited security visibility|
|scales far better than packets||cannot access packets for forensics or malware analysis|
13.1.4 Global vs Device View
This may be confusing for those coming to Trisul from traditional netflow solutions. Most of the Trisul dashboards are Global views that represent the sum total of all the interfaces in your network. If you see metrics for 22.214.171.124 it represents the TOTAL traffic to 126.96.36.199 from all the routers in your network.
There is also comprehensive support for a Device View. You access that through the Routers and Interfaces tool. The Device View allows you to select a router then an interface on that router and then see the breakup of traffic within that.
If you log on for the first time into a Netflow instance you may get a dashboard like below. The image below shows where to find the Router and Interfaces for getting to the Device Specific view.