NetFlow: What is it, why and how to use it? Miloš Zeković, ICmyNet Chief Customer Officer Soneco d.o.o.

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1 NetFlow: What is it, why and how to use it?, Soneco d.o.o. Serbia

2 Agenda What is NetFlow? What are the benefits? How to deploy NetFlow? Questions 2 / 22

3 What is NetFlow? NetFlow protocol IP Flow How it works NetFlow equivalents 3 / 22

4 NetFlow protocol Developed by Cisco Systems Classifies network traffic into 'flows' v5 - most common version, IPv4 v9 - template based, IPv6 and MPLS v10 (IPFIX) standardised, flexible fields 4 / 22

5 IP Flow RFC 3954 An IP Flow,..., is defined as a set of IP packets passing an Observation Point in the network during a certain time interval. All packets that belong to a particular Flow have a set of common properties... at the Observation Point. 5 / 22

6 IP Flow Cisco NF v5 Unidirectional sequence of packets that all share the following 7 values: Ingress interface (SNMP ifindex) Source IP address and Destination IP address IP protocol Source and destination port for UDP or TCP, 0 for other protocols IP Type of Service 6 / 22

7 How it works? Flow record Exporter Flow Collector Netflow Server (flow collection + aggregation) 7 / 22

8 How it works? (2) 8 / 22

9 NetFlow equivalents Jflow Juniper Networks NetStream - 3Com/HP NetStream - Huawei Technologies sflow Cisco, Juniper, HP, IBM, Huawei... 9 / 22

10 What are the benefits? Bandwidth utilization understanding Application monitoring Top consumers by host, service, QoS... Accounting/Billing Network optimization and planning Traffic trend visualization Traffic engineering 10 / 22

11 What are the benefits? (2) Faster network troubleshooting Faster, better diagnostics Complements network monitoring systems Network security Traffic anomaly analysis Flow records inspection Lower operational cost 11 / 22

12 How to deploy NetFlow? Netflow capability Configuring netflow export NetFlow Analyzers 12 / 22

13 NetFlow capability NetFlow capable devices: Routers L3 switches NetFlow probes e.g. softflowd Capability issues Netflow protocol conversion e.g. nprobe Multiple exporting e.g. samplicator Sampling 13 / 22

14 Configuring netflow export Export planning On what routers/interfaces to enable netflow Duplication issues Exporter configuration Configure exporters Setup sampling, conversion, probes Choose and setup netflow collector/analyser 14 / 22

15 Exporter configuration INCORRECT CORRECT 15 / 22

16 Double export example 16 / 22

17 De-duplication of netflow Duplication is usually a problem for networkwide statistics Some NetFlow analysers have automatic de-duplication Some Netflow analysers can be configured to avoid duplication 17 / 22

18 NetFlow Analysers - approaches Statistics per/by: exporter/interface application/service IP address group routers/interfaces group specific traffic host 18 / 22

19 NetFlow Analysers Commercial applications: ManageEngine NetFlow Analyzer SolarWinds NetFlow Traffic Analyzer Plixer - Scrutinizer Peassler PRTG Traffic Grapher Fluke Networks Soneco - ICmyNet/NetVizura / 22

20 Question time Questions? 20 / 22

21 Thank you 21 / 22

22 NetFlow: What is it, why and how to use it?, Soneco d.o.o. Serbia

NetFlow use cases. ICmyNet / NetVizura. Miloš Zeković, milos.zekovic@soneco.rs. ICmyNet Chief Customer Officer Soneco d.o.o.

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