NetFlow Analysis with Elastic Stack

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Presentation transcript:

NetFlow Analysis with Elastic Stack Elasticsearch Seoul Meetup NetFlow Analysis with Elastic Stack me@madkoala.net

Presenter manager at SK broadband me@madkoala.net I don’t have any f**king Btv coupons!

What is NetFlow? Cisco router feature that provides the ability to collect IP network traffic information on interfaces Main components Flow Exporter Flow collector (logstash) Analysis application (elasticsearch) Visualization (kibana or whatever works) Source: Wikipedia

NetFlow Architecture Source: Wikipedia

NetFlow Protocol (v5 header) Source: https://www.plixer.com/support/netflow_v5.html

NetFlow Protocol (v5 record) Source: https://www.plixer.com/support/netflow_v5.html

What we can do with NetFlow Application usage analysis Troubleshoot network problem Track down bandwidth hogs Detect abnormal traffic usage Detect hosts infected by malwares …

Elastic Stack - NetFlow Logstash: NetFlow collector Elasticsearch: NetFlow storage & analysis Kibana: Visualization

System Architecture 이보다 더 간단할 수 없다.

Logstash Configuration (input)

Logstash Configuration (filter) Calculate estimated traffic volume (need to consider sampling rate)  Enrichment with geolocation info

Logstash Configuration (output)

Template for NetFlow data

Collected data sample

Demo! Demo!! Demo!!!

Thank you.

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