One of the most powerful features of SD-WAN is its ability to continuously monitor the health of network tunnels. It tracks key performance metrics such as packet loss, latency, jitter, out-of-order packet percentages, and Mean Opinion Score (MOS). This makes it incredibly easy for businesses to pinpoint network issues and present clear, visual evidence of disruptions. 📊📉🔎
For Bob, a network engineer at a major investment house, this capability is a game-changer. At the click of a button, he can see when a remote office is experiencing 30% packet loss or unacceptable jitter. Even better, the orchestrator displays these findings in intuitive graphs and charts, making it easy for management to understand and act upon. However, there’s one major problem: ISPs never believe a shred of it. 🙄🚫💬
SD-WAN | The Swear Word That Triggers ISPs
Bob quickly learned that simply mentioning SD-WAN to an ISP could turn a support call into an argument. The reaction is almost comical—it's as if SD-WAN is a forbidden term, requiring a fine in a swear jar every time it's uttered. 🏦💰😡
Case Study | The Mysterious One-Way Packet Loss
One day, Bob’s SD-WAN system starts showing consistent one-way packet loss exceeding 30% between a remote office and the firm’s data center. Both locations are connected via dedicated internet access (DIA) fiber from the same ISP in the same city. A clear indicator that something is wrong, right? 🚦🔍🛠️
Following protocol, Bob contacts the ISP and presents a screenshot of the SD-WAN graph showing the problem. The response is immediate: “That doesn’t mean anything.” The ISP outright rejects the data without review. When pressed further, they claim, “We’re an ISP. We don’t drop packets.” They insist that their circuit tests show no issues, dismissing Bob’s claim altogether. 📞🚧🤦♂️
Even after Bob provides additional proof—traceroutes, reverse lookups, and pinpointing the problematic router in the path—the ISP remains defiant: “The problem is on your end. Contact your SD-WAN vendor.”
Fast forward a month later, and the packet loss mysteriously disappears. No updates, no resolution details—just a quietly closed ticket. 🤔🔄🔇
Case Study | Widespread Tunnel Failures Across ISPs
In another instance, Bob notices major tunnel failures and widespread packet loss affecting multiple locations. After analyzing the data, the issue appears to stem from two specific ISPs—ISP A and ISP B—struggling to communicate. 🌍🔗🚦
Armed with SD-WAN telemetry, Bob raises the issue with ISP A. Predictably, the response is the same: “You might want to call your SD-WAN vendor because we don’t have anything like that going on.” Bob escalates the case multiple times until, suddenly, his ticket is linked to a “Master Ticket.” Now, the ISP admits they are troubleshooting at a Network-to-Network Interface (NNI), bouncing ports, and cleaning fiber. Like magic, once the master ticket is resolved, everything returns to normal. 🧙♂️✨📡
Why the Skepticism Despite the Proven Accuracy?
The irony is that many ISPs now offer SD-WAN as a managed service. So why do they dismiss the same technology when customers use their own solutions? It seems that the moment SD-WAN is mentioned outside of an ISP’s controlled offering, its credibility is questioned. 🤷♂️🔄🛑
Advice for Network Engineers Dealing with ISPs
For engineers like Bob relying on SD-WAN to manage connectivity, here’s a key takeaway: Don’t mention SD-WAN to the ISP right away. Instead, replicate the findings using traditional network tools like iperf, traceroute, and packet captures, then present that data first. Once the ISP acknowledges the issue, SD-WAN data can serve as a secondary reference. 🏆📜🔧
Wrapping UP | SD-WAN’s Silent Success
Despite the resistance from ISPs, SD-WAN’s ability to absorb network failures without causing noticeable disruptions is a testament to its reliability. In Bob’s cases, end users remained unaffected even as SD-WAN dynamically rerouted traffic to maintain performance. The fact that 300+ VPN tunnels could experience failures without major business impact underscores why SD-WAN is a superior approach to enterprise networking. 🔄💡📶
The lesson? While ISPs may refuse to believe SD-WAN evidence, network engineers should trust the data—and keep pushing for accountability when networks fail.
