Ganesan Pakkirisamy

Experience

• 

  HCL Infosystems Ltd

  Jul 2011 - Apr 2016

  Network Engineer

  • Installed and configured Cisco Routers and switches.• Configured and Troubleshooted Switched Networks, VLANs, ISL and 802.1Q and VTP, Access lists, NAT.• Configured and Troubleshooted STP, RSTP for preventing loops.• Implemented HSRP for Gateway High availability• Monitored the networks / ensure maximum uptime. • Worked on Incident Management and Change Management.• Gained practical understanding of OSI Model, TCP/IP protocol suite (IP, ARP, ICMP, TCP, UDP, SMTP, FTP, TFTP)• Maintained inventory of equipment’s and parts as well as documentation of vendor activities• Installed and configured MRTG, CACTI and GestióIP on Linux server. Show less

• 

  Tech Mahindra

  May 2016 - Jul 2017

  Network Administrator

  • Implemented stand-alone and cluster XL configurations in Checkpoint, improving security and scalability.• Successfully deployed Checkpoint IP appliances, including the 15400 and 5400 GAiA versions, contributing to the improvement of network security infrastructure.• Maintained Load balancer operations for banking web and mobile apps• Created, updated and maintained firewall documents for firewall rules• Performed DC/DR drill activities for network area along with multiple application teams• Maintained WAN links & ODC firewalls• Performed SSL certificate renewals periodically• Applied configurations to network devices to comply with vulnerability assessments• Periodic software upgrades with minimal or no network disruption • Worked with vendors for planned activities and incidents Show less

• 

  Mphasis

  Jul 2017 - Mar 2019

  Lead Infrastructure Engineer

  Duties and Responsibilities:• Implemented stand-alone and cluster XL configurations in Checkpoint, improving security and scalability.• Successfully deployed Checkpoint IP appliances, including the 15400 and 5400 GAiA versions, contributing to the improvement of network security infrastructure.Accomplishments:• Engaged in changes to the implementation environment, ensuring seamless integration and functionality.• Led the facilitation of network security device refresh, prioritising capacity, manageability, and security considerations, resulting in an upgraded and more secure infrastructure.• Worked on transparent mode in Checkpoint, aligning configurations with client requirements for performance. Show less

• 

  Atos

  Mar 2019 - May 2020

  Network Consultant

  Duties and Responsibilities:• Implemented Palo Alto changes based on user INC/Task, fortifying security configurations and aligning them with industry standards.• Executed ASA changes, enhancing firewall configurations to meet specific business needs.• Conducted site refreshment activities for switches and access points, meticulously updating CMDB and monitoring systems for accurate documentation.• Facilitated the creation and implementation of changes in SNOW, ensuring seamless integration with Firewall, Router, and Switch configurations to streamline processes and improve efficiency.Accomplishments:• Successfully managed and resolved diverse incidents, tasks, and changes related to end users' LAN, Wireless, and Firewall issues, ensuring minimal disruptions and optimising network functionality.• Collaborated with remote site engineers at NSC Global to address site outages and fulfill on-demand requirements, ensuring swift resolution and minimising downtime for enhanced network reliability.• Configured devices to enhance network performance and improve user connectivity. Show less

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  Cognizant

  Jun 2020 - now

  • Managing two active-active data centres for uninterrupted critical network operations.• Executing regular software upgrades for Cisco Nexus 7K, 9K, Cat 3850 stacks, OTV Routers, ISE, Radware VX & vADC devices, maintaining N-2 compliance standards for enhanced system performance and security.• Managing vulnerability scans, incidents, and mitigated network vulnerabilities.• Managing Border Gateway Protocol (BGP) for MPLS and Open Shortest Path First (OSPF) for inter-data centre routing, optimising traffic flow between data centres.Manage FortiGate Firewalls, FortiManager & FortiAnalyser, and FortiGate SD-WANs.Enhance and improve monitoring in CheckMK and StableNet, responding to Major incidents when necessary.Manage Palo Alto firewalls, including rules, NAT configurations, and other essential tasks. Show less • Managing two active-active data centres for uninterrupted critical network operations.• Led and worked on a data centre migration from one location to another with zero service interruptions, handling the entire process from planning, coordinating client reviews, managing vendor engagements, and working closely with internal teams (server, database, and applications teams) to ensure smooth operations throughout the migration.• Executing regular software upgrades for Cisco Nexus 7K, 9K, Cat 3850 stacks, OTV Routers, ISE, Radware VX & vADC devices, maintaining N-2 compliance standards for enhanced system performance and security.• Managing RMA for network devices, minimising downtime and streamlining replacements.• Managing vulnerability scans, incidents, and mitigated network vulnerabilities.• Working on Business as Usual (BAU) tasks and projects, implementing the latest network solutions and technologies to enhance overall efficiency.• Managing Border Gateway Protocol (BGP) for MPLS and Open Shortest Path First (OSPF) for inter-data centre routing, optimising traffic flow between data centres.• Perform frequent visits to commission new equipment and servers.• Perform physical cabling and provide relevant IP configurations, ensuring devices are brought into the network using the approved change process. Show less • Managing two active-active data centres for uninterrupted critical network operations.• Executing regular software upgrades for Cisco Nexus 7K, 9K, Cat 3850 stacks, OTV Routers, ISE, Radware VX & vADC devices, maintaining N-2 compliance standards for enhanced system performance and security.• Managing RMA for network devices, minimising downtime and streamlining replacements.• Managing vulnerability scans, incidents, and mitigated network vulnerabilities.• Working on Business as Usual (BAU) tasks and projects, implementing the latest network solutions and technologies to enhance overall efficiency.• Managing Border Gateway Protocol (BGP) for MPLS and Open Shortest Path First (OSPF) for inter-data centre routing, optimising traffic flow between data centres. Show less

  • Network Infrastructure Specialist

    May 2024 - now

  • Network Infrastructure Specialist

    Apr 2022 - Apr 2024

  • Network Infrastructure Specialist

    Jun 2020 - Mar 2022