Splunk Search

Comparing IP Addresses for differences

swright_rl
Explorer

Hi All,

I'm trying to create a search, to potentially be made into a monitoring rule later on.

What I am trying to achieve is a way to compare if a user has logged into his machine from a wildly different IP address.  This will be using external IP addresses only.

As an example I want to know if a user logged into the estate from an IP which wasn't the same or similar as the previous day.

 

UserTodayYesterday
User A155.123.1.1155.123.1.1
User B155.124.1.2155.125.20.2
User C155.166.2.522.18.254.56

 

In the table able, I have 3 users, user A and B have logged into pretty similar IP's although user B has logged in from a different one today ( this often happens in our logs ).  What I am more wanting to see is User C, who has logged into from a completely subnet IP and is not similar to their IP from the previous day. 

This is what I have so far:

 

index=foo (earliest=-1d@d latest=now())  
| eval TempClientIP=split(ForwardedClientIpAddress,",")
| eval ClientIP=mvindex(TempClientIP,0) 
|  eval ClientIP1=mvindex(TempClientIP,1) 
|  eval ClientIP2=mvindex(TempClientIP,2) 
| search NOT ClientIP=10.*
| where LIKE("ClientIP","ClientIP")
| eval when=if(_time<=relative_time(now(), "@d"), "Yesterday", "Today")
| chart values(ClientIP) over user by when 
|  where Yesterday!=Today

 

 

Some context regarding the search the ForwardedClientIpAddress field has 3 items inside, ClientIP + ClientIP1 are the same address, ClientIP2 is the end internal address. ClientIP can be an internal address, which is why there is a NOT to remove it from the searches.

 

Any help would be very much appreciated. 

 

Thanks

Labels (1)
Tags (3)
0 Karma
Got questions? Get answers!

Join the Splunk Community Slack to learn, troubleshoot, and make connections with fellow Splunk practitioners in real time!

Meet up IRL or virtually!

Join Splunk User Groups to connect and learn in-person by region or remotely by topic or industry.

Get Updates on the Splunk Community!

Index This | What travels the world but is also stuck in place?

April 2026 Edition  Hayyy Splunk Education Enthusiasts and the Eternally Curious!   We’re back with this ...

Discover New Use Cases: Unlock Greater Value from Your Existing Splunk Data

Realizing the full potential of your Splunk investment requires more than just understanding current usage; it ...

Continue Your Journey: Join Session 2 of the Data Management and Federation Bootcamp ...

As data volumes continue to grow and environments become more distributed, managing and optimizing data ...