Cybersecurity enthusiast
Sridhar Cybersecurity & Network Infrastructure
Securing networks with advanced pfSense solutions and enterprise-grade security
About Me
Cybersecurity and networking professional with deep expertise in pfSense, firewall security, and network infrastructure design. Founder of NexusSec, offering Web Vulnerability Assessments (WEBVAPT), enterprise-grade network security solutions, and public DNS filtering services.
Adept at designing and managing advanced home lab environments, security automation, and penetration testing methodologies. Passionate about creating robust, scalable network architectures with a focus on security and performance.
Security Expert
Web Vulnerability Assessments (WEBVAPT) and penetration testing
Network Architect
pfSense deployments with multi-ISP failover and VPN integration
Security Automation
Custom dashboards and AI-driven CLI-to-Web UI solutions
Professional Experience
Present
Founder
NexusSec
- Built a cybersecurity firm offering Web Vulnerability Assessments (WEBVAPT) and Networking Design services
- Developed a public DNS service with filtering, blocking, and real-time reporting
- Designed secure and scalable network architectures using pfSense for enterprise and ISP-grade setups
- Implemented multi-ISP failover and load balancing using pfSense for high-availability networks
- Configured site-to-site VPNs, VLAN segmentation, and IDS/IPS for enhanced security
Ongoing
Advanced Home Lab Architect & Security Specialist
Self-Hosted Lab
- Network Security & Firewall Management:
- Running pfSense on a Lenovo ThinkStation P330, configured with dual-ISP failover, load balancing, and policy-based routing
- Implemented advanced firewall rules, VLAN segmentation, site-to-site VPNs, and IDS/IPS (Snort/Suricata) for enhanced security
- Managing SonicWall TZ200 alongside pfSense for comparative security analysis
- Virtualization & Server Management:
- Running Proxmox on a Dell PowerEdge R420, hosting multiple VMs for security research, networking simulations, and automation
- Deployed TrueNAS for network storage, optimized with RAID and NFS/Samba shares for efficient data access
- Integrated Zabbix monitoring for real-time performance tracking of all home lab systems
- Private DNS Infrastructure & Security Enhancements:
- Operating a private DNS server (dns.nexusseclabs) with custom filtering, blocking, and reporting features
- Configured AdGuard Home and Unbound for secure, encrypted DNS resolution with customized domain filtering
- Developing a public DNS service with reporting similar to NextDNS and AdGuard
- Automation & Custom Solutions:
- Built a custom Home Assistant dashboard running on a 10-inch tablet for real-time monitoring of Proxmox, pfSense, and network performance
- Designed a Stream Deck-like interface using Home Assistant to control critical home lab functions such as VM management, firewall rules, and DNS settings
- Running Ollama AI locally with a custom CLI-to-Web UI interface for on-prem AI processing
Previous Experience
Networking & Security Consultant
Previous Company
- Designed and deployed enterprise-level firewall solutions with pfSense and SonicWall
- Conducted security audits and penetration testing for corporate networks
- Optimized firewall rules, packet filtering, NAT configurations, and network segmentation
Technical Skills
Network Design & Security
- pfSense Advanced Configurations & Deployment
- Multi-WAN & VPN Integration
- Enterprise Network Architecture Design
- SD-WAN Implementation & Management
- IDS/IPS Configuration & Tuning
- SonicWall & Cisco IOS XR
- VLAN Segmentation & Network Isolation
- Zero Trust Architecture Implementation
Penetration Testing
- Web Application Vulnerability Assessment
- Network Infrastructure Penetration Testing
- Wireless Network Security Assessment
- Social Engineering & Phishing Campaigns
- Vulnerability Scanning (Nessus, OpenVAS)
- Exploitation Frameworks (Metasploit, Burp Suite)
- OWASP Top 10 Vulnerability Remediation
- Secure Code Review & Analysis
Systems & Development
- Linux Server Administration & Hardening
- Windows Server Management & Security
- Python Scripting for Security Automation
- Bash Scripting for System Administration
- DNS Services & Security Filtering
- Containerization & Virtualization
- CI/CD Security Integration
- Cloud Security (AWS, Azure)
Get In Touch
Contact Information
Feel free to reach out for projects, consulting, or just to say hello!
Location
Navi Mumbai, IN