topic Re: Problem: Searching for matching fields within multiple source types in Getting Data In

Problem: Searching for matching fields within multiple source types

KNichol5hd — Mon, 28 Sep 2020 13:29:32 GMT

I am a new Splunk user who uses Splunk to find infected hosts on our network. I currently run 3 separate searches to pinpoint the users but would like to combine them into one with the goal of ultimately having this e-mailed to myself.

These are the following searches:
sourcetype=pan:traffic src_translated_port=##### src_translated_ip=###.###.##.## earliest=11/02/2012:23:00:00 latest=11/03/2012:00:23:00

I then review these results to find the src_ip needed to run the subsequent searches.
Using the src_ip, I then run this search:
sourcetype=msdhcp earliest=11/02/2012:23:00:00 latest=11/03/2012:00:23:00 src_ip=###.###.##.###

I then review these results to find the MAC address associated with the first two searches.
Using the MAC address, I then run this search to determine the user associated with the MAC:
sourcetype=campusmgr earliest=11/02/2012:23:00:00 latest=11/03/2012:00:23:00 ##:##:##:##:##:##

Is there a way to combine these searches into one using map search or the eval commands?

Any insight would be appreciated. Thanks

Re: Problem: Searching for matching fields within multiple source types

martin_mueller — Mon, 11 Mar 2013 21:20:25 GMT

You could combine the searches like this:

sourcetype=campusmgr earliest=11/02/2012:23:00:00 latest=11/03/2012:00:23:00 [search sourcetype=msdhcp earliest=11/02/2012:23:00:00 latest=11/03/2012:00:23:00 [search sourcetype=pan:traffic src_translated_port=##### src_translated_ip=###.###.##.## earliest=11/02/2012:23:00:00 latest=11/03/2012:00:23:00 | return 100 src_ip] | return 100 MAC]

return takes the subsearch results, picks out the specified field (src_ip or MAC) and builds an OR'd chain of up to 100 or however many you like matches, which then get applied to the outer search as a filter. In order for this to work nicely you need to extract the MAC as a field in the campusmgr sourcetype... which probably is a good idea on its own.

Re: Problem: Searching for matching fields within multiple source types

gkanapathy — Tue, 12 Mar 2013 00:47:21 GMT

Note that you can leave out the time specifiers (earliest/latest) since you're using the same ones in all searches. Just specify the time using the time dropdown or the earliest/latest flags/parameters on the CLI or API, rather than directly in the query, and all searches and subsearches will use that time range.