This document provides a structured overview of route redistribution between OSPF and BGP, focusing on potential routing loops and mitigation […]
Redistribution Between OSPF and BGP: A Comprehensive Guide to Preventing Routing Loops Read Post »
In distributed enterprise architectures, leveraging independent high-availability (HA) pairs of Palo Alto firewalls across multiple data centers (DCs) provides robust
In enterprise network environments, high-availability configurations are essential for maintaining service continuity. Recently, during the implementation of two Palo Alto
What’s up, network nerds? If you’ve ever stared at a /24 subnet in your home lab and thought, “What’s actually
Python Network Scanner: Discover Hosts, MACs, and Open Ports in Your Lab Read Post »
Have you ever tried calling someone on WhatsApp, only to see “ringing” on your end while their phone just says
How I Fixed a WhatsApp Call Issue with One Contact Read Post »
Regex flavors are dictated by runtime environments. Online testers often prioritize these five due to their dominance: Differences arise from
Introduction to Selected Regex Flavors Read Post »
In today’s high-performance enterprise networks, ensuring firewall redundancy and scalability is critical. Palo Alto firewalls offer two high-availability (HA) modes:
AA(Active/Active) vs AP(Active/Passive) Palo Alto Firewalls Read Post »
An issue where users accessing certain websites through a FortiGate explicit proxy (with the FortiGate CA certificate imported into client
Fixing Certificate Errors for Web browsing via FortiGate Explicit Proxy Read Post »
We recently encountered a perplexing issue with the explicit proxy configuration on our FortiGate 121G running FortiOS 7.4.7, specifically when
FortiGate Explicit Proxy Issue with FQDN Resolution to IPv6 (FortiOS 7.4.7) Read Post »
Introduction As networking professionals, we rely on tools like NetFlow and PCAP (packet capture) to monitor, troubleshoot, and secure our
I recently encountered an issue with the proxy chain function on a FortiGate 121G running FortiOS 7.4.7, and I wanted
FortiGate Proxy Chain Issue with FQDN Resolution (FortiOS 7.4.7) Read Post »
I’m troubleshooting an unstable IPsec VPN where one peer is behind NAT, using UDP 500/4500, with issues like random firewall
How it works of DPD (Dead peer detection) in ipsec VPN and Troubleshooting Read Post »
As a network administrator managing FortiGate firewalls, I’ve encountered several critical but unannounced issues with FortiOS 7.4.7 on the FortiGate
Introduction Deploying a Proxy Auto-Configuration (PAC) file to manage network traffic routing is a powerful way to control proxy usage
Configuration of PAC file for dynamic proxy selection Read Post »
Network issues can be a real headache—slow connections, dropped signals, or mysterious glitches that leave you scratching your head. That’s
Top 25 wireshark filter Read Post »
What is Dead Peer Detection (DPD)? Dead Peer Detection (DPD) is a mechanism used in IPsec VPNs to determine whether
Deep into Dead peer detection and NAT-T of ipsec VPN Read Post »
I’ll explain each one step-by-step, structured logically to help you understand their purpose, how they fit into the IPsec framework,
What you should know about ipsec vpn? Read Post »
We’ve hit an odd snag with our Palo Alto PA-820 firewall, which serves as the core of our IPsec VPN
IPsec VPN Instability on Palo Alto PA-820: A Multi-Site Mystery Read Post »
What’s Nmap? Nmap (Network Mapper) is like a lazy guy’s spy kit—it scans networks, finds devices, and tells you what’s
Nmap for Network Scanning, for beginniner Read Post »
IPsec VPNs are critical for securely connecting distributed sites, such as a core office with a Palo Alto PA-820 firewall
How to Troubleshoot IPsec VPN Issues: Step-by-Step Guide for Palo Alto 820 Read Post »
In a previous analysis, detailed in The Curious Case of Deny Logs in Palo Alto SSL Decryption: A Troubleshooting Journey
Investigating PAN-273949: A Potential Resolution for SSL Decryption Deny Log Anomalies Read Post »
I recently added Cloudflare CDN to my WordPress site on Linode, updated GoDaddy nameservers to Cloudflare, and bam—every link hit
Cloudflare Flexible SSL vs. Full SSL: Fixing WordPress 301 Redirect Loops Read Post »
If you’re familiar with Cisco’s Management VRF, where management traffic is isolated into a separate routing domain, you might wonder
Configuring Fortinet Firewall Outbound Management: Cisco Mgmt VRF Equivalent Read Post »
As a network engineer managing a mixed environment—Cisco, Juniper, FortiADC, and AWS CDN—I recently hit a head-scratcher that didn’t have
FortiADC TLS Mismatch with Backend Servers: A Real-World Troubleshooting Case Read Post »
How I Fixed the “XML Declaration Allowed Only at the Start of the Document” Error in Yoast SEO Sitemap If
Traffic flow: AWS > Firewall > reverse proxy > Paloalto > Load balancer > Backend server If you’ve ever stared
The Curious Case of “Deny” Logs in Palo Alto SSL Decryption: A Troubleshooting Journey Read Post »
If you’re managing a FortiADC device and rely on its auto backup feature to keep your configurations safe, you might
FortiADC Auto Backup Failure to SFTP Server – A Fix in Firmware V7.6.1 Read Post »
