01
ISP Core Network Architecture
Design, deployment and operation of production ISP core network infrastructure including routing, traffic separation, upstream connectivity and IPv4/IPv6 architecture.
Hello, I'm
Zahidul Islam
Network Infrastructure & Systems Engineer
ISP Networks • Cisco • MikroTik • BGP • IPv4/IPv6 • Linux • Servers • Cybersecurity
ABOUT ME
Building Reliable Networks, Systems & Infrastructure
I am Zahidul Islam, an engineer specializing in ISP networking, network infrastructure, system administration and server deployment. I hold a Diploma in Electronics and a B.Sc. in Electrical and Electronic Engineering (EEE).
My hands-on experience includes Cisco and MikroTik routing, BGP, VRF, IPv4/IPv6, Linux servers, virtualization, DNS, network monitoring, bandwidth management and ISP infrastructure.
Alongside my infrastructure work, I am expanding my expertise in cybersecurity with a long-term focus on network security, security engineering and remote technical consulting.
TECHNICAL EXPERTISE
Core Skills & Technologies
Networking & ISP
Cisco
MikroTik
BGP
VRF
IPv4 / IPv6
PPPoE
CGNAT
OLT / PON
Systems & Infrastructure
Linux
Ubuntu Server
Proxmox
DNS
PowerDNS
dnsdist
Docker
Server Deployment
Monitoring & Security
LibreNMS
PRTG
SNMP
NetFlow
Grafana
Network Security
Cybersecurity
SELECTED PROJECTS
Infrastructure & Network Engineering
02
ISP Access Network & PON Deployment
Planning and implementation of ISP access networks using GPON and EPON technologies, including OLT deployment, ODN design, fiber distribution, splitter planning and optical power-budget management.
03
Network Monitoring & Observability
Deployment and administration of network monitoring, traffic analysis and infrastructure visibility systems for routers, switches, OLTs, servers and ISP services.
04
Linux Server & ISP Service Infrastructure
Deployment and administration of Linux-based ISP services and virtualized infrastructure using Proxmox VE, Ubuntu Server, virtual machines and containers. Implemented services include recursive DNS, DNS security and caching, ISP speed-test infrastructure, monitoring services and containerized applications.
PROFESSIONAL EXPERIENCE
Experience
Ghatail Online
Internet Service Provider | Ghatail, Tangail, Bangladesh
March 2018 – Present
Career progression from FTTx engineering and technical support to system administration and operational leadership, while continuing hands-on responsibility for production ISP network and systems infrastructure.
Chief Operating Officer (COO)
January 2024 – Present
Manage day-to-day ISP operations, workforce coordination, technical procurement, vendor and upstream relationships, billing coordination, power infrastructure, budgeting and infrastructure expansion.
System Administrator
February 2021 – Present
Operate and maintain production ISP network and systems infrastructure supporting 8,000+ customers and more than 25 Gbps of production traffic, including Cisco NCS, MikroTik, BGP, VRF, IPv4/IPv6, Linux, Proxmox, DNS, monitoring and GPON/EPON infrastructure.
Help Desk Support Engineer
July 2019 – January 2021
Provided ISP customer and operational support for PPPoE, ONU/ONT, connectivity and optical faults, provisioning, monitoring, escalation and service restoration.
FTTx Engineer
March 2018 – June 2019
Worked on GPON/EPON/FTTx deployment, OLT/ONU provisioning, ODN planning, fiber distribution, splitter deployment, optical power-budget validation and last-mile troubleshooting.
BGP & Routing
Cisco & MikroTik
IPv4 / IPv6
GPON / EPON / FTTx
OLT Infrastructure
Linux & Proxmox
DNS Infrastructure
Network Monitoring
ISP Operations
Technical Procurement
Power & Backup Infrastructure
Infrastructure Planning
EDUCATION
Academic Background
2022
B.Sc. in Electrical & Electronic Engineering (EEE)
Southeast University
2018
Diploma in Electronics
Tangail Polytechnic Institute
CERTIFICATIONS & TRAINING
Professional Development
2026
IPv6 and Routing Best Practices
Bangladesh Network Operators Group (bdNOG)
Technical workshop focused on IPv6 deployment, routing architecture and operational best practices.
06 May – 08 May 2026 • Dhaka, BangladeshCONTACT
Let's Connect
For networking, infrastructure, ISP, Linux, cybersecurity or technical collaboration:
hello@zahidbhai.com LinkedIn Profile