This add-on does local lookups of AS number, organization and selected geographic data for IP address(es) using the GeoIP2-format database from MaxMind and ASN data from the RIRS and iptoasn.com. It is based loosely on and intended as a near-drop-in replacement for GeoASN by Heinrik Strom at Telenor.

The following commands are provided

Your system must have the following installed prior to installing this add-on:

• Python version 2.6 or later. (These programs should run under Python 3 as well but have not been tested.)
• The GeoIP2 API for Python and all of its prerequisites. On Linux distributions derived from Red Hat, this is available in the EPEL repo as python2-geoip2.

You will need a license key issued by MaxMind. To do that:

• Sign up for a MaxMind account.
• Set up your password as directed in the confirmation email.
• Create a license key.

Copy the GeoASN2 directory into $SPLUNK_HOME/etc/apps.

In the copy, create a file in the etc directory called maxmind-license containing your license key.

In the top-level directory of the copy, run make to set up the add-on and update the data.

Optionally, test the programs using the procedure below.

Restart Splunk.

The data can be brought up to date by doing the following:

$ make -C $SPLUNK_HOME/etc/apps/GeoASN2 update

You can verify that the programs work by doing the following:

$ cd $SPLUNK_HOME/etc/apps/GeoASN2/bin
$ make test

If it works, you should see output for each of the programs that resembles this:

ip,country,asn,org
200.148.108.124,Brazil,27699,DE SAO PAULO S/A - TELESP
203.129.108.100,Japan,10000,Nagasaki Cable Media Inc.

If you have logs with a single IP address field:

* | lookup ga2 ip
* | lookup ga2 ip AS the_name_of_your_ip_addr_field

If you have logs with two IP address fields:

* | lookup geoasn2 src_ip dest_ip
* | lookup geoasn2 src_ip AS your_1st_field dest_ip AS your_2nd_field

TODO: This doesn't work the same way in this version.

If you always want your searches to lookup the Country, AS number and Organization for IP addresses, you can configure props.conf to do this:

[asa] LOOKUP-geoasn = geoasn2 src_ip dest_ip

In this example, all events with sourcetype 'asa' (Cisco firewall logs) will use the geoasn command to lookup the src_ip and dest_ip This produces the following fields:

src_country : The Country as found in the Maxmind GeoCity database dest_country : The Country as found in the Maxmind GeoCity database src_asn : The AS number and Org as found in the Maxmind ASN database src_as : The AS number, without the 'AS' prefix src_org : The Organization, without the AS number dest_asn : The AS number and Orgn as found in the Maxmind ASN database dest_as : The AS number, without the 'AS' prefix dest_org : The Organization, without the AS number

If the IP address being looked up is within the ranges defined in RFC 1918, the Country and Organization fields are set to 'RFC1918', to make it easy to filter on Private IP addresses. AS number is set to 0.

If the address was not found in the database, and it is not an RFC 1918 address, the Country and/or Organization is set to 'Unknown', and the AS number is set to 0.