In Splunk Enterprise Security, can you help me fix my search that uses the tstats command with a NOT operator?

[jvanbibber]

I'm trying to use the NOT operator in a search to exclude internal destination traffic. Any help would be great!

| tstats summariesonly=t count from datamodel=Network_Traffic where * by All_Traffic.dest All_Traffic.src | sort - count

[pkeenan87 · Accepted solution]

You could try and exclude RFC 1918 ranges from the dest field

| tstats summariesonly=t count from datamodel=Network_Traffic where All_Traffic.dest!=10.0.0.0/8 AND All_Traffic.dest!=172.16.0.0/12 AND All_Traffic.dest!=192.168.0.0/16 by All_Traffic.dest All_Traffic.src | sort - count

[jvanbibber]

Will give it a try, thank you!

[FrankVl]

And how would you recognize internal destination traffic in your case? Do you have asset enrichments in place, so you can do All_Traffic.dest_category!=internal or so?

Hard to help with this little information. We'll need better info on what your data looks like, how you think you want to recognize internal destinations and what you have tried so far.

[jvanbibber]

Well, based on IP private IP ranges is a good place to start, don't you think? 10.0.0.0/8
I don't know how I would incorporate that into the search string