My name is Daniel and i am from Prague in Czech Republic. This is my blog about about cyber security, networking, ethical hacking and digital forensics. Basically every exercise and labbing projects i do in my free and university time, i upload here. When i was 22 and came back from Iceland where i was working on a farm for half a year, i realized i want to work in IT.
Data Centre Network Support Technician
I had this job for only two months starting with February ending in April in 2019. Despite the short duration of this work I leant lot of things and it was the first time touched the networking, Linux, server building so I leant something about hardware as well. When i built a server, then i went to server room, mounted in the rack closet, plugged the fiber optic interfaces or 1 gigabit Ethernet cable based on customer’s requirements and then configured it. I made the RAID configuration and specified Linux OS such as CentOS, Ubuntu, Debian and others.
That was my first small experience i got in datacenter. Then left because i didn’t have any experiences.
ISP Internet Network Service Technician / Customer Service
After some self studying i managed to work for ISP company where i was working as service technician. I was connecting people to internet and repairing their internet connection, i loved this job because i got to work outside and still doing networking which was very fun. My work was mostly in Central Bohemian region, west and south part to be specific and sometimes Prague. The Bohemian region was better because there were houses mostly and easy to park and many time you could enjoy the nature and view from the roof. In my free time i was studying frequency range and was fascinated with those radio waves and electromagnetic specter where is actually the range which is visible light.
Imagine you are on a roof where you are mounting Nanostation AC from Ubiquity to the boom on chimney, and you are enjoying summer sunny afternoon forestry landscape all around you. You lay the cable where customer wants to, ideally i had to force them to let me leave the “Power over Ethernet” or “PoE” on the attic. Then lead it the living room because everyone wants to be on the phone while watching TV. Sometimes they were honest and told me they want to have a signal on the toilet as well. We were deploying routers WR0841 TP-link and for more heavy users like gamers or people that took more expensive tariff, TP-Link Archer C6.
On the main nodes in the network we were using OSPF to dynamically advertise the networks. On smaller transmitters we had edge router that has statically configured routes. I got to work on transmitters that had no router, just switch and some VLANs. These transmitters usually worked as a bridge to someone who had no choice to get another internet connection to their house on the village or hut. Since there are lot of edge routers with static router in the network, we had to go with multi-area OSPF because the routing tables the routers would go crazy. The major nodes on the network were one for Prague, one for Beroun area, one for Mníšek area. Those are main towns we were covering with connection and where i worked. Each of them we assigned subnet from private range. Prague was the only one that had B range, Beroun had 10.200.0.0/16 from class A but subnetted. Mníšek had many small subnet form class A.
The datacenter with BGP we had in Prague and i also heard that there is another one under the Žižkov tower that was in previous years in communism era used is radio Centre or something and now they are converting it to datacenter. I don’t know if there is another BGP or not but probably yeah. We were lucky because when i worked there we had thousands of public IP addresses, and new blocks ran out. That means if there was a new ISP company, they would have to wait until old ISP is bankrupts or terminates the business. I didn’t know much about the infrastructure, or how our backbone was design, so the stuff i talk about here is just what my colleague told me or what i heard or saw, i got to work on small transmitters only.
This job I held since May 2019 up until November 2020 before I left to UK on the university to study Cyber Security.
IT Cyber Security Consultant
In 2021 since May up until August i worked at KPCS s.r.o. Cyber Security company in Prague, my hometown in Czech Republic. I learned there so many things like how to configure Syslog for logging per device for company that distributes gas from Russia into Czechia and other countries in Europe. Also I was configuring Stormshield firewalls for deployment in location that server the purpose in case some hackers infiltrate them and attempt to acces the Programmable Logic Controllers (PLC) which are actually the machines that open and close valves for gas.
Unfortunately I had to the company didn’t allow me to work remotely and I had to go back to UK for my second academic year.
BSc (hons) Cyber Security
Working for the ISP was amazing, sometimes i really miss that. But i realized that IT is extremely large field, you never stop to learn, every employer wants you to know everything and if i want to make some progress then i probably have to have at lest bachelors degree, because i didn’t know how to approach this, where should i start to make some progress because at the ISP i was just going from house to house swapping antennas and routers and didn’t do any progress. So i left to UK to study Cyber Security (hons) bachelors degree.
I made a huge progress since I was here, I’m finishing my degree very soon and I learned a lot. I can create API in python, write a program that extracts packet headers, basics of forensics, use so many tools for hacking and so much more. I still want to improve my skills, that’s why i want to work and apply for masters as well.