Networking Tech with Fexingo: Internet Infrastructure, Routing, and Network Engineering

When a small regional ISP in Kentucky misconfigured its BGP route advertisements in March 2025, it took down major websites across North America for nearly four hours. Lucas and Luna dissect the anatomy of that leak — how a single router at a provider called NetRural accidentally advertised 20,000 more-specific prefixes, causing Amazon, Google, and Cloudflare to reroute traffic through congested p...

Episode 28 dives into Remote Direct Memory Access (RDMA), the networking technology that lets servers move data directly between their memory without involving the CPU or operating system. Lucas explains how RDMA has become essential for high-performance computing and storage in modern data centers, citing a specific example: a large cloud provider cut latency from 100 microseconds to under 10 for...

Lucas and Luna dive into SRv6 (Segment Routing over IPv6), the new protocol quietly reshaping how major ISPs and cloud providers route traffic across the internet. They break down how SRv6 simplifies the network stack by embedding instructions directly into the packet header, eliminating complex MPLS labels and reducing CPU load on core routers. Using real-world examples from providers like Comcas...

Ever wonder what happens when data crosses from one network to another? Lucas and Luna explore the hidden backbone of the internet: internet exchange points (IXPs). They zoom in on the Amsterdam Internet Exchange (AMS-IX), the world's largest IXP by connected networks. Lucas explains how IXPs reduce latency and cost compared to traditional peering, why they're critical for streaming and gaming, an...

The internet's routing table is built on trust, which means any network can accidentally — or maliciously — claim ownership of IP blocks that don't belong to them. This episode dives into Resource Public Key Infrastructure (RPKI), the cryptographic framework designed to prevent BGP hijacks and route leaks. Lucas explains how RPKI works, why only 42 percent of the global routing table is currently...

In this episode, Lucas and Luna dive into the Domain Name System as a critical routing layer that most users never see. They explain how DNS queries traverse multiple servers, the difference between recursive and authoritative resolvers, and the real-world impact of a slow or misconfigured DNS. Using Cloudflare's 1.1.1.1 and Google's 8.8.8.8 as examples, they discuss how DNS routing can affect pag...

Border Gateway Protocol is the glue that holds the internet together, but it was designed for trust, not security. In this episode, Lucas and Luna dig into BGP hijacking — how a single misconfigured or malicious announcement can reroute global traffic, redirect email, or even steal cryptocurrency. They walk through the 2008 Pakistan YouTube incident, the 2018 AWS route leak, and the mechanics behi...

Lucas and Luna dive into intent-based networking (IBN), one of the most under-hyped shifts in network engineering. Instead of manually configuring each switch and router, network engineers define high-level business intent—'make sure finance traffic never drops below 99.99% uptime'—and software translates that into low-level device configs. Lucas breaks down how vendors like Cisco and Juniper are...

Lucas and Luna dive into the rise of edge computing for latency-sensitive applications. Lucas traces the shift from centralized cloud to distributed edge nodes, using specific examples like autonomous vehicle data processing and industrial IoT. He explains how companies like Cloudflare and Amazon are deploying tiny data centers closer to users—reducing round-trip times from 50 milliseconds to unde...

In this episode, Lucas and Luna explore the paradox of network redundancy: why adding a second path sometimes makes your system less reliable. They break down the 2017 British Airways IT meltdown at Heathrow, where a single misconfigured backup generator caused a 30-hour outage that stranded 75,000 passengers. They explain the mathematics of shared-risk link groups and the concept of 'uncorrelated...

In this episode of Networking Tech with Fexingo, Lucas and Luna explore how low-Earth orbit satellite constellations like Starlink are changing the landscape of internet infrastructure. They discuss why traditional satellite internet had high latency, how LEO networks achieve speeds comparable to fiber, and the challenges of interference, space debris, and orbital congestion. The episode also cove...

Most people think the internet runs on physical routers you can touch. But for the last decade, a quiet revolution has been pulling network functions off dedicated hardware and into software — a process called network function virtualization, or NFV. In this episode, Lucas and Luna trace NFV's origins from the 2012 AT&T Domain 2.0 initiative to today's cloud-native 5G cores. They break down how vi...

Episode 17 of Networking Tech with Fexingo dives into QUIC — the transport protocol quietly replacing TCP for much of the web's traffic. Lucas and Luna break down how QUIC reduces latency by combining encryption and connection setup into a single handshake, and why Google, Meta, and Cloudflare have already bet big on it. They walk through a real-world example: a user loading a page over QUIC vs. T...

Episode 16 of Networking Tech with Fexingo: Lucas and Luna explore the shift from traditional network monitoring to network observability. They dive into how telemetry, streaming data, and tools like Netflix's Vector pipeline give engineers real-time insight into network behavior. The hosts discuss the difference between monitoring known metrics and discovering unknown unknowns. Lucas breaks down...

Episode 15 of Networking Tech with Fexingo dives into network automation — the shift from manual CLI configuration to software-defined, intent-based networking. Lucas and Luna explore how companies like Netflix and Google use automation to manage tens of thousands of devices, the role of tools like Ansible and Terraform, and what it means for network engineers' jobs. They discuss the 'automation p...

Episode 14 of Networking Tech with Fexingo explores Time-Sensitive Networking (TSN), the standards-based approach to delivering deterministic latency over standard Ethernet. Lucas and Luna break down how TSN works—using gating mechanisms, clock synchronization via 802.1AS, and scheduled traffic—and why it matters for industrial automation, autonomous vehicles, and audio-video bridging. They walk t...

Episode 13 of Networking Tech with Fexingo dives into segment routing (SR-MPLS and SRv6), a technology that's quietly replacing complex MPLS traffic engineering with a simpler, source-routed model. Lucas and Luna unpack how segment routing works, why it reduces network state by up to 90 percent in some cases, and how companies like Google and Microsoft are using it to handle exploding traffic from...

This episode of Networking Tech with Fexingo explores Zero Trust Network Architecture — what it really means, why it's replacing the old castle-and-moat model, and how a major bank like JPMorgan Chase began implementing it in 2024. Lucas explains the concept of micro-segmentation and the 'never trust, always verify' principle, while Luna raises real-world deployment challenges. The conversation al...

Episode 11 of Networking Tech with Fexingo digs into Multiprotocol Label Switching (MPLS), the decades-old routing technology that still underpins most enterprise wide-area networks. Lucas and Luna explain how MPLS works by creating virtual circuits through provider backbones, why it survives despite cloud migration and SD-WAN hype, and where it's being quietly retired. Using a real example—a Fort...

Episode 10 of Networking Tech with Fexingo dives into network observability — a shift from traditional monitoring to real-time, data-driven insight. Lucas and Luna explore how tools like eBPF and open telemetry are giving engineers unprecedented visibility into packet flows, application performance, and security anomalies. They break down a real example: how a major streaming service used observab...

Episode 9 of Networking Tech with Fexingo dives into network slicing — the technology that lets mobile operators carve a single 5G tower into multiple virtual networks, each with guaranteed latency and bandwidth. Lucas and Luna walk through a real-world case: how Volkswagen uses a private 5G slice at its Wolfsburg factory to control automated guided vehicles with sub-10 millisecond latency, while...

Lucas and Luna unpack the invisible backbone of internet performance: network peering agreements. This episode drills into the 2024-2025 dispute between Cogent Communications and several major transit providers, and how a single disagreement over 'settlement-free peering' degraded user experience for millions. They explain the difference between transit and peering, the role of interconnection poi...

In this episode of Networking Tech with Fexingo, hosts Lucas and Luna explore the physics and engineering that determine network latency—why your data doesn't travel at the speed of light, and how companies like Cloudflare and Akamai use edge computing to shave milliseconds. They break down the real-world impact of latency on everything from video calls to algorithmic trading, and explain why a fe...

Episode 6 of Networking Tech with Fexingo unpacks software-defined wide-area networking (SD-WAN) — the technology that is quietly replacing MPLS circuits in thousands of corporate branch offices. Lucas and Luna walk through a real-world deployment at a 500-store retail chain, where SD-WAN slashed monthly connectivity costs by 40 percent and cut failover time from minutes to milliseconds. They expl...

This episode of Networking Tech with Fexingo drills into a single vulnerable piece of the internet: the subsea cable system that carries 99% of intercontinental data traffic. Lucas and Luna trace a real 2024 outage in West Africa caused by a single ship anchor dragging across cables off Abidjan. They explain why the cable repair fleet has shrunk to 60 vessels worldwide, how geopolitical tensions a...