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Ian Marrero Posts

GIAC GCIH Certified!… and some tips.

On October 16 2019, I passed GCIH exam with a score of 93%. Honestly, I was surprised I scored so high. I didn’t feel like I had a passing score until 2.5 hours (out of 4 hours) into the exam. The exam is designed to measure your knowledge on the many cyber attack types and tools discussed in their book material. In order to pass, it is important to understand in which stage of incident handling you are in. Additionally,…

Enabling Intel 10G SFP+ X520 Series module on Centos 7

By default, Centos 7 doesn’t support Intel’s 10G SFP+ X520 module. When you look at the dmesg you find the following error: “failed to load because an unsupported SFP+ or QSFP module type was detected.” The workaround is to allow unsupported SFP modules in the kernel by enabling ixgbe kernel module. Let’s start by editing /etc/default/grub file and change the line : to Now, we create the new grub configuration with the new option. Next, the configuration file for the…