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erivera3/README.md

Eladio Rivera

Systems & Infrastructure | Active Directory | Networking | Troubleshooting


๐Ÿš€ About

Built and operated a multi-system lab environment supporting real users, designed under constraints such as ISP limitations, hardware inefficiency, and network instability.

12+ years managing high-accountability environments, now applying that same operational mindset to IT systemsโ€”focusing on troubleshooting, system reliability, and controlled deployment.

Work is centered on identifying failures, making decisions under constraints, and restoring system functionality across Windows, Azure, virtualization, and networked environments.


๐Ÿ›  Core Skills

  • Active Directory & user lifecycle management
  • Windows / Azure environments
  • Virtualization (Proxmox)
  • Networking (TCP/IP, DNS, DHCP, VLANs)
  • Firewall configuration (OPNsense / pfSense)
  • Help desk workflows & ticketing systems (osTicket)
  • Troubleshooting & system diagnostics
  • Technical documentation

๐Ÿ’ป Projects

๐Ÿ”น Homelab Infrastructure (System Administration & Networking)

๐Ÿ‘‰ View Project

Context:
Environment supporting ~13 real systems, built under hardware, network, and ISP constraints.

Key Problems Solved:

  • ISP router restriction preventing full network control
  • High power consumption and thermal inefficiency from legacy hardware
  • Fragmented storage and lack of centralized data management
  • Flat network design with limited traffic control

Decisions & Actions:

  • Introduced OpenWRT and OPNsense to regain routing and firewall control
  • Consolidated storage using TrueNAS with ZFS
  • Redesigned infrastructure using smaller, energy-efficient hardware
  • Reimaged and deployed 13 systems for real user environments

Result:

  • Stable multi-system environment with controlled networking and centralized storage
  • Reduced power usage, heat, and operational noise
  • Real-world troubleshooting across DNS, AD, networking, and deployment
  • Environment actively used and maintained, not simulated

๐Ÿ”น Help Desk & Ticketing Systems (osTicket)

Projects:
Deployment in Azure
Configuration & Setup
Ticket Lifecycle Examples

Context:
Simulated support environment to understand how ticketing systems behave under different configurations and access constraints.

Key Problems Solved:

  • Application deployment blocked by misconfigured dependencies
  • Lack of structured ticket routing and ownership
  • Limited agent permissions preventing escalation

Decisions & Actions:

  • Diagnosed and resolved IIS, PHP, and MySQL integration issues
  • Structured help desk using roles, departments, teams, and SLA policies
  • Simulated restricted access scenarios requiring escalation and admin intervention

Result:

  • Fully functional ticketing system with controlled access and workflow structure
  • Demonstrated understanding of how configuration impacts system behavior
  • Experience troubleshooting multi-layer application environments

๐Ÿ”น Azure & Active Directory

Projects:
Active Directory Deployment
Network Security & Traffic Inspection

Context:
Cloud-based environment to analyze system communication, identity management, and network behavior.

Key Problems Solved:

  • Domain join failures due to DNS misconfiguration
  • Network communication issues between virtual machines
  • Lack of visibility into how traffic behaves at the protocol level

Decisions & Actions:

  • Reconfigured DNS to align with domain controller requirements
  • Validated connectivity and network placement within Azure
  • Used Wireshark to analyze real traffic across ICMP, DNS, DHCP, SSH, and RDP
  • Applied and tested NSG rules to control traffic flow

Result:

  • Functional Active Directory environment with domain-joined systems
  • Improved troubleshooting through traffic-level validation
  • Clear understanding of how cloud security rules impact real communication

๐Ÿšจ Incident Response (Transferable Skills)

Projects:
Wildfire Incident Response System
Earthquake Response Protocol (coming soon)
Campus Security Intruder Response (coming soon)

Context:
Managed a real-world emergency involving 100+ individuals under uncertain and rapidly changing conditions.

Key Problems Solved:

  • Unclear threat progression with limited visibility
  • Need for immediate decision-making without external direction
  • Risk of delayed response under pressure

Decisions & Actions:

  • Established predefined evacuation triggers to eliminate hesitation
  • Implemented continuous monitoring and escalation protocols
  • Reduced system load (population) to improve control and response speed

Result:

  • Maintained full operational control with no injuries or incidents
  • Demonstrated structured response under pressure
  • Direct alignment with incident response, escalation workflows, and operational reliability in IT environments

๐Ÿ“˜ Certifications


๐ŸŽฏ Current Focus

  • VLAN segmentation & network design
  • Firewall deployment (OPNsense)
  • Active Directory expansion
  • Infrastructure documentation

๐Ÿค Connect

Popular repositories Loading

  1. erivera3 erivera3 Public

  2. osticket-prereqs osticket-prereqs Public

    Azure lab installing and configuring osTicket with IIS, PHP, MySQL, and Windows 10.

  3. post-install-config post-install-config Public

  4. ticket-lifecycle ticket-lifecycle Public

  5. configure-ad configure-ad Public

    Active Directory deployment in Azure including DNS configuration, domain join, OU structure, bulk user creation, account lockout policy, and log analysis.

  6. azure-network-protocols azure-network-protocols Public

    Azure lab demonstrating network traffic analysis with Wireshark and security control using Network Security Groups (NSGs).