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Problem Summary A major enterprise customer reported intermittent slowness across multiple departments. Applications were taking longer to respond, voice quality degraded, and video calls were choppy. This issue seemed to affect users connected to different VLANs and floors. The complaint was urgent and escalated to […]
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If you’ve ever been stuck with “Why isn’t my IPv6 ping working?”, then this blog is for you. Unlike IPv4, IPv6 brings new protocols, new behaviors, and new bugs, which means you need to troubleshoot with fresh eyes and fresh commands. Whether you’re preparing for […]
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If you’re reading this, you’re probably at that point in your IPv6 learning journey where the real challenge isn’t IPv6 itself—it’s the transition from IPv4. The world isn’t flipping a switch overnight. Most networks still run IPv4, and we need mechanisms to make IPv6 work […]
![Mastering IPv6 Routing: A Complete Guide with Labs, CLI & FAQs [CCNP ENTERPRISE]](https://networkjourney.com/wp-content/uploads/2025/07/nj-blog-post-IPv6-routing.jpg)
If you’re reading this, you’re either deep into the world of IPv6 already or you’re preparing to face it soon. IPv6 is no longer just a future plan—it’s the reality of today’s networks, especially with the exhaustion of IPv4. If you’ve ever wondered “How does […]
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When I started teaching networking years ago, IPv4 was king. Subnetting was everyone’s nightmare (and still is ). But over time, I noticed a shift. Devices kept growing, IP conflicts became more common, and NAT started showing its limits. That’s when IPv6 really started to […]
![VPN 0 and VPN 512 in Cisco SD-WAN: Backbone & Management Explained[CCNP ENTERPRISE]](https://networkjourney.com/wp-content/uploads/2025/06/nj-blog-post-vpn0-vpn512.jpg)
Today diving deep into a very important, yet often misunderstood part of SD-WAN architecture — VPN 0 and VPN 512. When you start exploring Cisco SD-WAN (Viptela), you’ll quickly notice the use of different VPNs not just for end-user data, but for control, management, and […]
![Performance Routing (PfR) Basics: Optimize Traffic Like a Pro [CCNP ENTERPRISE] networkjourney](https://networkjourney.com/wp-content/uploads/2025/06/nj-blog-post-PFR.jpg)
Today’s article, we’ll dive into one of the most powerful yet underrated features in enterprise networks — Performance Routing (PfR). While traditional routing protocols like OSPF or BGP make decisions based on shortest path or metrics like cost, PfR goes beyond. It chooses the best […]
![Hub-and-Spoke in Modern WANs: Still Relevant in 2025?[ccnp enterprise]](https://networkjourney.com/wp-content/uploads/2025/06/Slide1.jpg)
Today we’re going back to one of the core building blocks of WAN design — the Hub-and-Spoke topology. Even in today’s era of SD-WAN and cloud-first networks, the hub-and-spoke model remains relevant, especially for centralized security, legacy MPLS, and hybrid branch setups. Whether you’re starting […]
![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, […]
![IP SLA Configuration for Failover: Step-by-Step Guide with EVE-NG Lab & CLI [2025]. [CCNP ENTERPRISE]](https://networkjourney.com/wp-content/uploads/2025/06/IP-SLA-Configuration-for-Failover_networkjourney.png)
Today I want to take you into one of the most practical tools you can add to your network reliability toolkit: IP SLA with tracking for failover. Back when I was setting up redundant internet links for my enterprise clients, we needed a way to […]
