How do i setup netflow

This will result in fairly specific and granular flows. If you want broader coverage for individual flows, adjust as needed. The collect statements are for configuring what the flow records contain. In our example, we are only looking at the size of the packets, the interface, the tcp flags, and the time the flow started and ended. You can also add application-specific fields, flow direction, and other attributes.

The flow exporter is more straightforward. This is where you define the IP address of the NetFlow server you are sending to, and what interface you want to send from. Keep in mind you can not source from a normal switchport, you need some type of L3 interface.

You can also source from a loopback address or specific VLAN virtual interface if desired. We also specified a UDP port and time-to-live value, which are optional. Flow samplers are one of the benefits of Flexible NetFlow. A flow sampler allows you to limit the flow records that are sent, which can help with limiting the amount of resources that are consumed on the switch. It can also help with preventing overloading your NetFlow server. The configuration of them is straightforward.

You just need to pick a mode, and how large of a sample you want to send. You then need to specify the sampler you want to use when applying your Flow monitor to an interface. The flow monitor combines your flow record and flow exporter, and sets the maximum amount of time a flow will cover. The cache timeout arguments are measured in seconds.

Here, we are saying if a flow lasts longer than 60 seconds, create a new flow. If a flow is idle for 15 seconds, consider it inactive, and export that to the server. All other tradenames are the property of their respective owners.

Submit Search. Account Settings Logout. Select Enable NetFlow. For the protocol version, select V5 or V9. To monitor IPv6 traffic, you must use V9. In Fireware v The collector is the server that collects NetFlow data from the Firebox.

For example, you can set a Trigger Condition as when Application traffic exceeds the threshold and then set an Ingress Traffic parameter. There is also a day free trial version. You can monitor NetFlow with sensors. All traffic is presented in a graphical overview which shows a Top Talkers, Top Connections, and Top Protocols, alongside a time period of your choice. The sensors can be configured to send you alerts via email and SMS if traffic reaches unusual levels.

NetFlow monitoring is extremely useful as part of your network monitoring strategy because it allows you to view traffic and to identify cyber-attacks like DoS or DDoS. If you plan to use a NetFlow monitoring to oversee your network then it is a good idea to download a NetFlow analyzer.

It will provide you with a GUI to monitor traffic and make it easier to identify cyber-attacks. Monitoring traffic will help you to keep a watchful eye on performance and security events. This site uses Akismet to reduce spam. Learn how your comment data is processed.