I help businesses design, secure, troubleshoot, and optimize enterprise network and infrastructure environments.
With 12+ years of hands-on experience in ISP, Data Center, Enterprise Networking, and Systems Administration, I have successfully deployed and managed Cisco, Palo Alto, MikroTik, VMware, Linux, and cloud-based infrastructure solutions for organizations of all sizes.
My expertise includes Network Architecture, Network Security, Firewall Deployment, Routing & Switching, VMware Virtualization, Linux Administration, and Infrastructure Monitoring. I specialize in designing highly available, scalable, and secure environments that improve performance, reduce downtime, and support business growth.
Core Expertise:
✔ Network Architecture & Design
✔ Network Security & Firewall Solutions (Palo Alto, Cisco ASA/FTD, pfSense, Sophos)
✔ Enterprise Routing & Switching (BGP, OSPF, EIGRP, MPLS)
✔ Data Center & ISP Network Infrastructure
✔ Cisco Nexus, Catalyst, ISR, ASR & Meraki
✔ MikroTik Routing, VPN, VLAN & Automation
✔ VMware vSphere, ESXi & Virtualization
✔ Linux System Administration (RHEL, CentOS, Ubuntu, Debian)
✔ AWS Networking & Cloud Infrastructure
✔ Monitoring & Observability (Zabbix, SolarWinds, Grafana, Prometheus, LibreNMS)
✔ Network Automation using Python
✔ Security Assessment (Wazuh, Nessus, Nmap, OpenVAS)
✔ SSL/TLS Certificate Deployment & Management (Commercial SSL, Let's Encrypt, Renewal & Troubleshooting)
✔ Linux Infrastructure & Services
DNS (Primary DNS, Secondary DNS)
Mail Servers (Zimbra, Postfix)
Web Servers (Apache, Nginx)
Hosting Platforms (WHM, cPanel, WordPress)
FTP Services
TACACS+
FreeRADIUS
Samba File Services
Whether you need a new network deployment, firewall migration, VPN implementation, BGP/MPLS troubleshooting, VMware infrastructure support, or security hardening, I can deliver reliable and business-focused solutions.
Let's discuss how I can help strengthen and optimize your infrastructure.
Network Security
VPN
Python
System Administration
VMWare
Cisco IOS
Cisco Meraki
Sophos Sophos UTM
Cisco Router
Kubernetes
Network Engineering
Red Hat Enterprise Linux
Linux System Administration
MikroTik RouterOS
Network Monitoring
Toufik H.
Dhaka, Bangladesh
$50/hr
4.9
107 jobs
I have over 12+ years of practical working experience in VPN (Openvpn, IPSec, PPTP, IPSec/L2TP), Networking (Cisco Nexus, ISE, Juniper, Mikrotik, Ubiquiti) firewall (Sonicwall, Watchguard,Fortigate, Sophos, checkpoint, ASA, Palo Alto), Cloud system (AWS, Digital Ocean, Azure), WAF (F5), Cisco ISE, Mail server (SPF,DKIM,DMARC records) and troubleshooting.
Apart of that have working experience on Azure sentinel, 365 Defender, Defender for Cloud, Nessus
Also I am holding the following vendor certification
1. Cisco Certified Network Associate
2. Red Hat Certificate of Expertise in Server Hardening
3. Red Hat Certificate of Expertise in Server Hardening
4. Red Hat Certified Virtualization Administrator - (RHCVA)
5. Red Hat Certified Engineer (RHCE)
6. Red Hat Certified System Administrator (RHCSA)
7. Red Hat Certified System Administrator in Openstack
8. ISC2 - Certified in Cybersecurity Certification
9. AWS Certified Solutions Architect - Associate
I am interested to work on any project related to VPN, Network and cloud Security, Cisco, VoIP, Asterisk, FreePBX, Elastix, IP Networking, Firewall, Linux system administration, and network/server troubleshooting.
Network Security
Firewall
VPN
Cisco ASA
Web Proxy
Cisco ISE
OpenVPN
Cisco ACI
Palo Alto Firewalls
F5, Inc.
Information Security
Asterisk
FortiGate Firewall
Amazon Web Services
Md Norul A.
Dhaka North City Corporation, Bangladesh
$40/hr
5.0
169 jobs
I am a Dynamic, Dedicated, Passionate and Quickly Adaptable Freelancer with Technological innovations. I am a 🏅Upwork-Skill-Certified Freelancer with ✅100% JSS ✅ 70%+ Long-Term Clients ✅ 80%+ Clients Recommendation ✅ 90+ Active and Completed Jobs with Positive Feedback🏅Architect Certified on Sophos, Fortinet Firewalls and Endpoints Managements ✅ Others Certification on Network and Security✅ Strong and long Experiences on Fortinet, Sophos, SonicWall, Palo-Alto, PFSense Infrastructures Deployments, Migration and Managements✅ Any kinds of Wireless and Voice Solution Deployments✅ Network, System Security & Compliance Managements✅ Strong Experience on Routing & Switching🏦 Long-Experience with MSP, Corporate and Solution/Service-Provider Sectors. 🏦 Already worked with 90+ clients from different regions such as Asia, Africa, US, Europe etc.
🎖️Certifications (Completed & Enrolled)
• Upwork Skill Certification - Customer Service.
• Certified Architect by Sophos and Fortinet.
🏅 Sophos Certifications:
• Sophos-Firewall v19.5-Engineer.
• Sophos Firewall v19.5-Architect.
• Sophos Firewall v19.5 to v20.0 Certified Architect Delta (AU80).
• Sophos Firewall v19.5 to v20.0 Certified Engineer Delta (EU80).
• Sophos Firewall v20.0 to v21.0 Certified Architect Delta (AU80).
• Sophos Central Endpoint and Server v4.0-Engineer.
• Central Endpoint and Server v4.0-Architect.
• Sophos Central Endpoint v4.0 to v5.0 Architect Delta (AU15).
• Sophos Central Engineer Delta v4.0 to v5.0 (EU15).
🏅 Fortinet Certifications:
• NSE-7 (Network Security Architect) –NSE-ID:- 0Qjbf0qGSd
• NSE-4 (Network Security Professional) – NSE-ID:- GThFxY1viO
• NSE-5 (Network Security Analyst) on FortiAnalyzer- NSE-ID: - 8gIRCniwPN.
• NSE-1 (Network Security Associate) By Fortinet License Number: OYBF7cetpL.
• NSE-2 (Network Security Associate) By Fortinet License Number: FTsFjlmHck.
🏅 Other Certification:
• CNSS (Certified Network Security Specialist) By ICSI, UK License Number: 18427811
• Cisco Certified Network Associate (Routing & Switching) Cisco-ID: - CSCO13303817
Here, I would like to share my Working experiences, fields of expertise and much more-
✅ I have 9 years plus hands-on experiences on Network, System, Security administration, Deployment and Migrations on different Infrastructures along with direct involvements/cooperation on different known issues from Deployment stage to end-user’s support.
✅ Fields of Specialization:
1. Because of having 9 years plus exclusive experiences on different Fortinet, Sophos, SonicWall, PFSense, Palo-Alto and other Infrastructures Deployments and Administration I can work with the Complete Design, Deployments, Migrations and Integrations on these Different types of Infrastructures such as-
• Fortigate, Forti-APs, Forti-Switches, FortiVoice-Enterprise, Forti-Manager, Forti-EMS,FortiAnalyzer, FortiAuthenticator, FortiNAC, Fortinet Security Fabric Devices, FortiSandbox, FortiToken/Mobile/Service.
• Sophos Infrastructures Managements such Firewalls, Endpoints, Switches, APs etc.
• SonicWALL Infrastructures Managements such as Firewalls, NSM, Capture-Clients Endpoints etc.
• Palo-Alto, Barracuda, PfSense, Cisco-Firepower, Firepower-Thread Defence and FMC and Others Firewalls Managements.
• Migration To/From any of these above Infrastructures.
3. Long experiences on the Network and System Administration on these Infrastructures-
• Routing & Switching on Cisco, Mikrotik, Juniper, HP, Dell, Aruba etc.
• Wireless Implementation on Cisco, Aruba, Ruckus, 4Ipnet, Unifi/Ubiquiti, Forti-AP, Cambium, Altai, TP-Link-Omada, Teltonika etc.
• Mail-Server Administration on Office365, G-Suite by Google, Zimbra etc.
• Windows Server Managements.
• Virtualization & Datacentre Managements on VMware, ESXi, vSphere or VCenter, Hyper-V, Synology-NAS/SAN and Others.
• Voice Solution implementation on renowned Voice Solution Providers such as FortiVoice Enterprise, Grandstream, 3cX, Synway, Yeastar-PBX, FreePBX etc.
• Endpoint Solution Deployments on TrendMicro, Sophos Endpoint Protection, FortiClient by Forti-EMS (Endpoint Management Server), ESET etc.
• Complete Video Conferencing Solution on Dahua, Polycom etc.
• Surveillance, Attendance reader solution on Hikvision, Dahua, ZKTecho, Handuri etc.
4. I am a quick and dynamic learner. I can adjust myself with the Technological innovation within a very short amount of time.
5. I am a technical person with a Never Give-Up character.
I have multiples valuable feedback with great reviews on Upwork. You can also have a look at that.
If you have any further query on me just send "Hi" in Upwork.
Network Security
Firewall
VPN
Fortinet
Network Administration
FortiGate Firewall
Security Infrastructure
Palo Alto Firewalls
Wireless LAN Controller
Security Management
Sophos Sophos UTM
VoIP PBX
System Administration
PfSense
SonicWall
A.K.M. Tohidur R.
Dhaka, Bangladesh
$100/hr
5.0
141 jobs
As a highly skilled and experienced professional with over 08+ years of expertise, I hold notable certifications such as CCNP, CCNA, RHCE, and Certified Ethical Hacker (CEH) . I have established myself as an accomplished network, system, and security engineer, capable of delivering complete solutions for designing, configuring, automating, and managing network and system projects. My proficiency in using simulation software such as Packet Tracer and GNS3, as well as real-life network and system devices, make me a valuable asset for any project.
My few hands-on experiences is:
⭐Network Design by MS Visio, Cisco packet tracer, GNS3, and EVE-NG
⭐Netacad CCNA and CCNP packet tracer Labs activities, projects design and solution
⭐ Expert in configuring, managing, and troubleshooting Cisco routers, switches, FTD, FMC, and ASA firewalls.
⭐ Expert in configuring, managing, and troubleshooting Fortigate, Sophos, Check Point, SonicWall, Palo Alto, pfSense, OPNsense & Huawei firewalls,
⭐Netgear, Huawei, Aruba switch, DrayTek router, TP-Link and others vendor wireless router configurations.
✅Cisco, Tp-Link, Aruba, Fortinet, Ubiquiti, Planet, Huwei switch configurations.
⭐Proficient in configuring, managing, and troubleshooting Unifi Enterprise Fortress Gateway, UDM Pro, Unifi Cloudkey, USG UniFi Firewall , Security Gateway, Switch, and AP devices.
⭐Expert in Linux administration, with expertise in Ubuntu, Red Hat, openSuse, CentOS, Debian, and Kali Linux distributions.
⭐Expert in Windows server administration , Active Directory management, Exchange Server administration, DNS configuration, DHCP implementation, and Windows operating system support.
⭐Experienced in managing and configuring virtualization platforms including HYPER-V, VMware ESXi, VMware Workstation, KVM, VirtualBox, and Proxmox.
⭐Servers: HP Proliant Servers, Dell/EMC Servers, IBM
⭐MikroTik Routers configuration
✅ Cloud Administrator: Azure, AMAZON AWS , Google GCP, OVH and Digital Ocean
⭐VLSM/subnetting of small to large enterprises
⭐VLANs, Inter-VLAN routing, VTP, CDP, Ether-Channel(LACP, PAGP), Spanning Tree (STP, PVST++, MSTP), and FHRP Protocols
⭐IPV4 & IPV6 IP planning, DHCP, NAT/PAT configuration and IP helper address
⭐static and Dynamic Routing protocols (RIP, OSPF, EIGRP, BGP) configuration
⭐Layer-3 Redudent/backup links Using HSRP, VRRP
⭐Port security, ACL( access list) configuration
⭐Network troubleshooting and optimization
⭐VPN Configuration Expert (GRE , SSL, IPSEC, PPTP, OPENVPN , wireguard & DMVPN)
⭐Advanced Excel skills, including macro, VBA, VLOOKUP, and other automation techniques
⭐Network automation script for any cisco and fortigate devices using python
⭐ Skilled in automation using Bash/Shell scripting
✅Overlay Networks VPN Expertise: Proficient in configuring and managing various overlay network VPNs, including ZeroTier, Tailscale, WireGuard, SoftEther VPN, Netbird , Netmaker, OpenVPN Cloud, I, Twingate and PeerVPN for secure, scalable, and decentralized networking, enabling seamless remote access, team collaboration, and encrypted communications across distributed systems.
✅Beryl AX and Flint Router Configuration Expert ( Mini Router, Travel Router, Home Wi-Fi, cellular Router) like GL-MT6000, GL-AXT1800, GL-MT3000, GL-A1300 etc
✅Cisco Duo: MFA, 2FA, SSO, Identity Security Integration, Windows Logon, RDP, Microsoft AD, VPN Authentication.
Network Security
Cisco Certified Network Professional
Firewall
VPN
Network Administration
Linux
Windows Server
System Administration
FortiGate Firewall
Linux System Administration
Cisco Certified Network Associate
PfSense
Ubiquiti
Cisco
Fortinet
Sajib P.
Dhaka, Bangladesh
$25/hr
5.0
3 jobs
I have over 12+ Years of working experience in the Networking Field.
I am an enthusiastic NETWORK ENGINEER with the necessary drive and determination needed to resolve complex networking issues. Possessing effective organizational skills and excellent working knowledge of networking technologies and having a commitment to keep up to date with the latest developments. I’m an adaptable and efficient team player with excellent communication skills at all levels. Experienced in providing motivation, guidance, and an up-to-date networking consultancy service to clients.
Now looking for a new and challenging network engineering task that will make the best use of my existing skills and experience and also further my career as a freelancer.
Technical Skill Set Summary::::::::
• Cisco routers / switches / WLC
• Cisco ASA / FTD / ISE / FMC
• Cisco NX-OS
• Network Automation using Python3
• Checkpoint Firewall & Endpoint Security
• Sophos XG Firewall & Intercept X with advance EDR
• Gateway Redundancy Protocols: HSRP / VRRP / GLBP
• Routing: RIPng / OSPF / EIGRP / BGP / PBR / PfR / VRF
• VLANs / STP / RSTP / Ether channel (LAG)
• VPNs – GRE / IPSec / DMVPN
• LAN-WAN / NAT / ACL
• IPv4 / IPv6
• F5 Load Balancer
• SIEM-Splunk, Qradar, Wazhu, Suricata, Elastic
• Juniper Junos
• Palo Alto Next-Generation Firewall
• Fortinet Solutions- FortiGate Firewall, FortiMail email gateway, and FortiAnalyzer.
• Juniper firewalls SRX Series
• TCP/IP, DNS, DHCP
• Wireshark
• MikroTik
• Virtualization: VMware vSphere 6.x
• Windows Server 2012 R2
Qualifications:
• Cisco Certified Specialist - Security Core (CCNP SCOR-350-701)
• Cisco Certified Network Associate (CCNA-R&S)
• Palo Alto Networks Certified Network Security Engineer (PCNSE)
• APPLICATION DELIVERY FUNDAMENTALS (F5-101)
• Fortinet Network Security Expert (NSE 1, NSE 2, NSE 3 & NSE 4)
• JNCIA-SEC (JNCIA-SEC)
• Junos (JNCIA-Junos)
Network Security
Cisco Certified Network Professional
Firewall
VPN
Cisco
Cisco IOS
Cisco Firepower Threat Defense
MikroTik
FortiGate Firewall
Palo Alto Firewalls
Cisco Router
PfSense
Fortinet
Network Design
Cisco ASA
Router
MikroTik RouterOS
F5, Inc.
Cisco ISE
Nasir R.
Paltan, Bangladesh
$20/hr
4.8
3 jobs
# Total 8 years of experience in different types of Network Design, Implementation
and operations in diverse types of organizations,
# Have earned CCNP Encor, PCNSE, NSE4, JNCIA and RHEL Certifications,
# Have experiences of big network infrastructure projects like Core and Perimeter
Firewall migrations, Data Center Implementations, Proxy services deployment for
10k users, Cisco ACI deployment, Network Automations
# Have solid skills and experience on Routing, Switching( Campus & Data Center),
Firewalling, SDN, Automation, Basic System administration, PAM
# Have working experience on Cisco, Palo Alto, Juniper, Mikrotik, Pfsense, Fortinet
products,
# Also have knowledge on network and system automation using Ansible and python,
# Always up for new challenges and have a solid troubleshooting skills.
Firewall
DHCP
DNS
Cisco ASA
Web Proxy
Cisco ACI
Cisco Firepower Threat Defense
Palo Alto Firewalls
Data Center
Border Gateway Protocol
Network Monitoring
Routing
Ansible
Juniper
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