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lukasdula (Lukáš) · GitHub

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lukasdula/README.md

Hi, I'm Lukas

I'm an aspiring Network Engineer from the Czech Republic. I have completed CCNA I – Introduction to Networks at Czech Technical University in Prague and I actively build networking projects in GNS3.

I enjoy designing networks and understanding how routing, security, and monitoring work together in real-world scenarios.

Projects & Labs

I’m building a portfolio of projects in Packet Tracer and GNS3. These projects show my progress from simple labs to more complex networks. You can find all my projects and labs in the -> repositories section.

Goals

  • Build a strong junior network engineer portfolio
  • Improve network security and firewall rules
  • Learn how to work with firewalls in network labs
  • Learn MikroTik RouterOS in GNS3
  • Build better and more complex networks

Skills

  • Networking: VLAN, Inter-VLAN routing, static routing, OSPF, NAT/PAT, ACL, VRRP, GRE tunnels, LACP, RSTP, NTP, ...
  • Network security: OPNsense firewall, firewall rules, NAT, RADIUS authentication
  • Monitoring: Zabbix, Wireshark, basic traffic analysis, Rsyslog
  • Server services: DHCP, DNS, HTTP (Apache2 / IIS), SSH, RADIUS server, Active Directory
  • Lab tools & virtualization: GNS3, Cisco Packet Tracer, VirtualBox, KVM/QEMU
  • Operating systems: Windows, Linux, Windows Server 2022
  • Documentation: Obsidian, Visual Studio Code, Markdown

Connect with me

   Lukáš Dula

   lukasdula@seznam.cz

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  1. project-02-packet-tracer-distribution-network-infrastructure project-02-packet-tracer-distribution-network-infrastructure Public

    A medium-sized distribution network is my second project in Cisco Packet Tracer (CZ & EN documentation)

    2

  2. project-01-GNS3-small-office-network project-01-GNS3-small-office-network Public

    Cisco-based small office network built in GNS3. Uses VLANs, static routing, DHCP, NAT/PAT, and ACL-based security. Includes Windows Server, Windows 10 clients, and Cisco IOS/IOSv-L2 devices.

    1 1

  3. project-02-GNS3-medium-company-network project-02-GNS3-medium-company-network Public

    Cisco-based medium-sized company network in GNS3 using VLANs, OSPF failover on VLAN 99, RSTP, DHCP relay, Linux DNS/HTTP services, NAT/PAT, port security, ACL-based security and Wireshark.

    2

  4. project-03-GNS3-advanced-network-design project-03-GNS3-advanced-network-design Public

    Cisco-based advanced network design in GNS3 using VLANs, DHCP, OSPF, VRRP redundancy and failover testing, LACP, RSTP, PortFast, and BPDU Guard. Focuses on reliable Layer 2 and Layer 3 design.

    1

  5. project-04-GNS3-enterprise-network project-04-GNS3-enterprise-network Public

    Cisco-based enterprise network built in GNS3 with HQ and Branch sites. Uses GRE tunnel, OSPF routing, VRRP gateway redundancy, DNS,HTTP, DHCP, Rsyslog,PuTTY, and Zabbix monitoring.

    1 1

  6. project-05-GNS3-network-security-operations project-05-GNS3-network-security-operations Public

    Cisco-based security-focused network in GNS3 using OPNsense firewall, RADIUS authentication, Windows Server (DHCP, HTTP, DNS), WireGuard VPN access, and segmented VLANs.

    2

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