Introduction Picture this classroom demo: A user walks into the office, opens Wi-Fi settings, selects Corporate-BYOD, and — without IT touching the laptop — receives an identity certificate, configures the OS supplicant, and gets 802.1X/EAP-TLS access to the corporate network. No passwords, no wasteful help-desk […]
Introduction Mixed-vendor networks are the reality: Cisco campus switches, Aruba aggregation, Juniper edge, and multi-vendor controllers often coexist. Cisco ISE is commonly used as the central RADIUS/Policy engine — but different vendors implement RADIUS dynamic features (CoA/Disconnect/VSA) and 802.1X behavior with vendor-specific quirks. This masterclass […]
![Ticket#10 - NAT Overload Failure: Why Users Couldn't Access the Internet – A Real Fix [CCNP ENTERPRISE]](https://networkjourney.com/wp-content/uploads/2025/07/nj-blog-post-Ticket-10.jpg)
Problem Summary In a mid-sized enterprise, users across VLANs suddenly reported that they couldn’t browse the internet or access external services. While internal services like file sharing and internal DNS were operational, anything beyond the firewall was unreachable. Symptoms Observed Root Cause Analysis Initial checks […]
![Ticket#9 - WAN Flap Detection: DMVPN Phase 2 Tunnel Up/Down Issue Fixed [CCNP Enterprise]](https://networkjourney.com/wp-content/uploads/2025/07/nj-blog-post-Ticket-9.jpg)
Problem Summary The enterprise monitoring tool detected flapping tunnels between remote branch routers and the HQ hub.Ticket Priority: HighIssue: DMVPN Phase 2 Tunnel intermittently goes UP/DOWN, causing loss of reachability to HQ and apps like VoIP. Symptoms Observed Symptom Description Tunnel state flapping Tunnel interface […]
![Ticket#6 - DHCP Not Working on Access Layer – Troubleshoot Snooping and Relay [CCNP ENTERPRISE]](https://networkjourney.com/wp-content/uploads/2025/07/nj-blog-post-Ticket-6.jpg)
Problem Summary In a mid-sized enterprise campus network, multiple users reported they were unable to get IP addresses from the DHCP server. The issue was isolated to specific access switches connected to VLAN 30. The DHCP server was reachable via Layer 3 on a core […]
![DIA vs Centralized Breakout: Which Internet Access Model Is Right for Your SD-WAN Network in 2025?. [CCNP ENTERPRISE]](https://networkjourney.com/wp-content/uploads/2025/06/DIA-vs-Centralized-Breakout-Which-Internet-Access-Model-Is-Right-for-Your-SD-WAN-Network-in-2025_networkjourney.png)
If you’re currently designing or managing SD-WAN solutions, you’re probably facing one of the most critical architectural questions: Should you go with DIA (Direct Internet Access) or a Centralized Breakout model? Choosing the right internet access model can significantly impact your application performance, security posture, […]
![Ansible Playbook for VLAN Configuration – Automate Smarter, Not Harder! [CCNP ENTERPRISE]_networkjourney](https://networkjourney.com/wp-content/uploads/2025/07/Ansible-Playbook-for-VLAN-Configuration-–-Automate-Smarter-Not-Harder-1.png)
Today I’m excited to walk you through something that every network engineer aiming to embrace automation must learn — Ansible Playbook for VLAN Configuration.I still remember those days when I’d log in to 10–20 switches one by one, just to create the same VLANs. It […]
![Route Redistribution with Tagging – Mastering Controlled Routing Across Protocols [ CCNP ENTERPRISE ]_networkjourney](https://networkjourney.com/wp-content/uploads/2025/06/Route-Redistribution-with-Tagging-–-Mastering-Controlled-Routing-Across-Protocols-CCNP-ENTERPRISE-.png)
Today we’re diving deep into a topic that often haunts network engineers during real-world implementations and certifications like CCNP or CCIE — Route Redistribution with Tagging. I still remember a consulting project where a simple redistribution misstep created routing loops and service disruption across multiple […]
![iBGP vs eBGP Differences – A Deep Dive with Real-World Examples [ CCNP ENTERPRISE ]_networkjourney](https://networkjourney.com/wp-content/uploads/2025/06/iBGP-vs-eBGP-Differences-–-A-Deep-Dive-with-Real-World-Examples.png)
Today I’m diving into one of the most fundamental yet often misunderstood topics in BGP – the difference between iBGP and eBGP. Whether you’re prepping for CCNA/CCNP or working on a real enterprise network, understanding these two forms of BGP peering is absolutely essential. I […]
![Static vs Dynamic Routing – Which One Should You Trust in Real Networks? [CCNP ENTERPRISE]](https://networkjourney.com/wp-content/uploads/2025/06/Static-vs-Dynamic-Routing–Which-One-Should-You-Trust-in-Real-Networks_networkjourney-1.png)
“Should I use static or dynamic routing here?” — welcome to a real-world networking dilemma. When I started out in the networking field, I leaned heavily on static routes because they were simple and easy to control. But as networks grew more complex, I quickly […]
