How to convert MaxMinds MMDB GeoIP to DAT format so that I can use with modsecurity+Apache. Modsecurity supports only DAT format.
As of February 2019, the following Python script is the best option for converting GeoIP2 MMDB format to legacy .dat format:
https://github.com/sherpya/geolite2legacy
Using this script, somebody has done the conversion and made the resulting .dat files available for download: