Splunk Search

DDoS: How to find average connection count per IP in 5 minute window?


Hi friends, I am trying to piece together some splunk searches across application logs to try and piece together what 'normal' traffic patterns look like, vs DDoS attacking IP addresses. The end goal is to answer the question: "For each IP that connects to our application, what is the average connection count within a 5m span, across a 2 hour period? What are the outlier ( greater than average) 5m span connection counts? 

I have the following timechart which has been useful, but I'm sure there is a better way to do this. 


index=myapplicationindex sourcetype=_json cluster=cluster23 | timechart span=5m count by x_forwarded_for where count > 75



Labels (2)
0 Karma

Ultra Champion

Use streamstats with time_window=5m (there is however an upper limit on events within the window - by default it's 10000 - so if you accumulate more than this number, your search may fail or produce erroneous results).

0 Karma
Get Updates on the Splunk Community!

Improve Your Security Posture

Watch NowImprove Your Security PostureCustomers are at the center of everything we do at Splunk and security ...

Maximize the Value from Microsoft Defender with Splunk

 Watch NowJoin Splunk and Sens Consulting for this Security Edition Tech TalkWho should attend:  Security ...

This Week's Community Digest - Splunk Community Happenings [6.27.22]

Get the latest news and updates from the Splunk Community here! News From Splunk Answers ✍️ Splunk Answers is ...