Technical Publications

Recent technical publications

Following is a list of some of my recent technical publications.

FortiManager core operations and device database status article thumbnail

Technical Guide: Understanding FortiManager core operations and device database status / policy package status with examples

Technical guide to FortiManager core operations, covering device database and policy package workflows, common status conditions, and practical remediation steps to keep centralized deployments healthy.

Fortinet · FortiManager · Configuration Management

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Selective control and monitoring of GenAI / LLM applications with FortiGate

Technical Guide: Selective control & monitoring of GenAI / LLM applications with FortiGate

Design considerations and policy patterns for selectively allowing, inspecting and monitoring GenAI / LLM application traffic using FortiGate, with examples of security controls for campus and enterprise environments.

Fortinet · GenAI · Application Security

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Deep Dive: Understanding the FortiGate NP7 packet flow and drop types for each of the sub-modules

Deep-dive article on the FortiGate NP7 packet-processing pipeline, explaining how traffic traverses each sub-module and how to interpret drop counters and diagnostics.

Fortinet · NP7 · Packet analysis

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Technical Guide: FortiGate Wireless-Controller to FortiAP configuration push issues and solutions

Troubleshooting guide for resolving configuration sync and push issues between FortiGate wireless controllers and managed FortiAP access points, with field-tested fixes.

Fortinet · Wi-Fi · Troubleshooting

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FortiSwitch Spanning Tree Protocol troubleshooting

Technical Guide: FortiSwitch Spanning Tree Protocol (STP) troubleshooting

Field guide for diagnosing and fixing STP-related issues on FortiSwitch platforms, including loop detection, port states and interoperability scenarios.

Fortinet · FortiSwitch · STP

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Technical Guide: FortiGate PKI certificate usage & troubleshooting

Practical guide to deploying and troubleshooting PKI certificates on FortiGate, covering enrollment patterns, certificate chains and common misconfigurations.

Fortinet · PKI · Certificates

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FortiGate QoS traffic shaping considerations for NP7 platforms - QTM vs TPE engines

Technical note comparing QTM and TPE traffic shaping engines on NP7-based FortiGate platforms and providing guidance for QoS design.

Fortinet · NP7 · QoS

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FortiSwitch high memory usage troubleshooting guide

Troubleshooting runbook for investigating and resolving high memory conditions on FortiSwitch devices, with commands, debug flows and remediation options.

Fortinet · FortiSwitch · Performance

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FortiGate — Collect device parameters of all the connected devices in the network

How-to guide on using FortiGate to collect and export device parameters for all connected endpoints, useful for inventory, compliance and troubleshooting.

Fortinet · Visibility · Automation

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FortiManager API troubleshooting using browser developer tools

Article demonstrating how to leverage browser developer tools to debug FortiManager API calls, inspect requests and responses, and trace errors.

Fortinet · FortiManager · APIs

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FortiGate custom application signature troubleshooting with an LLM application example

Example-driven guide on building and troubleshooting custom application signatures on FortiGate, illustrated using an LLM-based application.

Fortinet · Application control · LLM

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Technical Guide: Identifying the FortiGate reboot reasons and what to do next

A step-by-step Fortinet technical guide that walks through troubleshooting techniques to interpret FortiGate reboot behavior, key log artefacts, common field patterns and recommended next actions.

Fortinet · Troubleshooting · NGFW

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Use of switch-info and custom-commands on FortiGate to collect CLI outputs from multiple managed FortiSwitches in one go

Practical note on using FortiGate switch-info and custom-commands to gather troubleshooting outputs from many FortiSwitches simultaneously, reducing time-to-diagnosis.

Fortinet · FortiSwitch · Automation

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Older technical publications

Cisco SASE presentation at CiscoLive 2021 by Rudresh Veerappaji

CiscoLive 2021 conference session covering Secure Access Service Edge (SASE) architectures, design patterns and migration approaches for enterprise networks.

Cisco · SASE · Conference talk

Watch session

Ivy - Patient Help: Digitizing Healthcare Services

Cisco hackathon project that combines collaboration platforms and open-source components to build an end-to-end digital patient help solution with triage bot, ML-based analytics and secure telehealth workflows.

Cisco · Healthcare · Machine Learning

View project · Demo repo

Group Encrypted Transport VPN (GETVPN) Design and Implementation guide 2.0 (co-author 2018) 220 pages

Co-authored design and implementation guide describing large-scale GETVPN deployments, key management and best practices for secure multicast and unicast WAN.

Cisco Systems · VPN · Design guide

Read guide

IOS-XE Datapath Packet Trace Feature

Cisco document explaining how to use the IOS-XE datapath packet trace feature to understand packet handling and diagnose complex forwarding issues.

Cisco Systems · IOS-XE · Packet trace

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VRF-Aware Management on ASR Configuration Examples

Configuration example guide for enabling VRF-aware management on Cisco ASR platforms, with walkthroughs of management plane separation and access models.

Cisco Systems · ASR · VRF

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Configure Phase-3 Hierarchical DMVPN with Multi-Subnet Spokes

Cisco configuration example describing hierarchical DMVPN topologies with multi-subnet spokes, including hub-spoke layout and routing design.

Cisco Systems · DMVPN · Design

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SD-WAN Security Deployment Guide

Cisco SD-WAN security deployment guide describing full edge security stack and policy models for securing DIA and cloud access use cases.

Cisco · SD-WAN · Security design

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