Adding hostnames to IP addresses
In this recipe, you will learn how to add hostnames to IP addresses in the log data by leveraging external lookups. There are many times where a hostname value can be more valuable than an IP address, and it can provide an easier identifier around what clients are connecting to your application. Many ISP-based connections can be very identifiable by the format of their hostnames, which can help you identify potential malicious activity.
Getting ready
To step through this recipe, you will need a running Splunk Enterprise server, with the sample data loaded from Chapter 1, Play Time – Getting Data In. You should be familiar with navigating the Splunk user interface.
How to do it...
Follow the steps in this recipe to lookup hostnames for given IP addresses:
On your Splunk server, create a new
transforms.conffile at$SPLUNK_HOME/etc/apps/operational_intelligence/local/transforms.conf. If one already exists, then you can just edit the existing file.Add the following...
