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

Lucas and Luna explore network slicing—the technology that carves dedicated virtual networks out of a single physical infrastructure. They dig into how a hospital in Stockholm used network slicing to guarantee bandwidth for remote robotic surgery, and why mobile operators see it as the key to monetizing 5G. Along the way, they discuss the role of orchestration, the tension between flexibility and...

Lucas and Luna dive into MPLS traffic engineering—how ISPs and large enterprises use label-switched paths to balance load, reduce latency, and avoid congestion. They walk through a concrete example: a tier-1 ISP rerouting 40% of inter-city traffic after a fiber cut, using explicit paths and bandwidth reservation. Luna asks how TE differs from ordinary routing, and Lucas explains RSVP-TE, constrain...

Lucas and Luna dive into the engineering behind Low Earth Orbit satellite constellations and how they're changing internet backbone routing. They explain why Starlink's mesh network of thousands of satellites requires a new routing protocol called 'BGP in space,' how laser crosslinks between satellites reduce latency compared to fiber, and the challenge of handing off connections as satellites mov...

In this episode of Networking Tech with Fexingo, Lucas and Luna explore the shift from perimeter-based security to Zero Trust Network Access (ZTNA). They break down the core principle - 'never trust, always verify' - and how it's being implemented in modern networks using microsegmentation, identity-aware proxies, and continuous endpoint verification. The hosts discuss real-world examples like Goo...

In this milestone 100th episode of Networking Tech with Fexingo, Lucas and Luna explore a topic that hits close to home for every network engineer: how automation is fundamentally changing the job itself. They walk through a concrete example—a mid-sized enterprise that replaced manual switch configuration with Ansible playbooks, cutting deployment time from 8 hours to 18 minutes. They discuss what...

Episode 99 of Networking Tech with Fexingo dives into network verification — the practice of mathematically proving that network configurations satisfy policy before deployment. Lucas and Luna explore how tools like formal verification and model checking catch subtle bugs that slip past human review, using a real outage case: a misconfigured ACL that brought down a major bank's trading floor for h...

In this episode of Networking Tech with Fexingo, Lucas and Luna explore how Remote Direct Memory Access (RDMA) is transforming data center networking by allowing servers to exchange data directly without CPU intervention. They break down how RDMA bypasses traditional kernel overhead, reducing latency to single-digit microseconds and cutting CPU load by over 90 percent. Using examples from hypersca...

In this episode of Networking Tech with Fexingo, Lucas and Luna dive into Ethernet VPN (EVPN) and how it is fundamentally changing data center network design. They explain why traditional VLAN-based architectures are struggling with modern scale and mobility, and how EVPN uses BGP-based control planes to provide Layer 2 and Layer 3 connectivity across fabric. The hosts walk through a real example...

Episode 96 of Networking Tech with Fexingo explores how fixed wireless access (FWA) is bridging the digital divide. Lucas and Luna break down the technology behind millimeter-wave spectrum, beamforming, and the economics of deploying WISPs in rural and suburban areas. They discuss real-world case studies from companies like Starry and Common Networks, and explain why FWA is becoming a viable alter...

Episode 95 of Networking Tech with Fexingo dives into the engineering behind 400 Gigabit optical transport networks. Lucas and Luna explain how coherent optics, advanced modulation formats like 64QAM, and wavelength division multiplexing push single-fiber capacities past 30 terabits per second. They trace the evolution from 10G to 400G, discuss the role of the OIF 400ZR standard in hyperscaler dat...

Lucas and Luna explore how network observability data lakes are transforming the way engineers store and analyze telemetry data. They discuss the limitations of traditional monitoring databases, the role of open-source columnar stores like Apache Parquet and ClickHouse, and how companies like Netflix and Cloudflare have reduced query times from minutes to milliseconds. The episode also covers sche...

Episode 93 of Networking Tech with Fexingo dives into the hidden world of peering — the agreements that connect networks and determine how your data travels. Lucas explains the difference between public peering at Internet exchanges and private peering between large providers, using the 2021 Facebook outage as a case study to show what happens when peering breaks. He walks through the economics: s...

Episode 92 of Networking Tech with Fexingo dives into network chaos engineering—a discipline borrowed from software testing that proactively injects failures into production networks to build resilience. Lucas and Luna explore how companies like Netflix and Cloudflare use controlled experiments (e.g., randomly killing DNS servers, corrupting BGP routes) to uncover hidden failure modes before they...

Episode 91 of Networking Tech with Fexingo dives into P4 programmable switches — hardware that lets network engineers define their own packet-processing behavior instead of being locked into fixed silicon. Lucas and Luna explore how companies like Google and Microsoft use P4 for custom telemetry, in-band network telemetry (INT), and rapid protocol prototyping. They walk through a concrete example:...

Episode 90 of Networking Tech with Fexingo explores the surprisingly critical role of Network Time Protocol in financial trading. Lucas and Luna break down the 2020 Nasdaq timestamp failure, where a 15-microsecond clock drift triggered a million-dollar flash crash. They explain how PTP and White Rabbit synchronization keep high-frequency trading honest, why the SEC now mandates submicrosecond accu...

Episode 89 of Networking Tech with Fexingo dives into Network Configuration as Code (NetConfig-as-Code), a paradigm shift where network engineers manage router and switch configurations using version-controlled declarative languages like YANG, Jinja2, and Ansible. Lucas opens with a story about a major financial firm that reduced configuration errors by 78% after adopting a Git-based workflow. Lun...

Episode 88 of Networking Tech with Fexingo explores Zero-Touch Provisioning (ZTP) — the automation technique that lets network engineers deploy a router straight out of the box without touching a command line. Lucas and Luna break down how ZTP works, from DHCP option 67 to bootstrap scripts, and walk through a real-world case: a regional ISP that cut per-site deployment time from four hours to 12...

Lucas and Luna unpack Ethernet VPN (EVPN), the technology quietly replacing traditional VLANs in modern data centers. They walk through a real migration at a mid-sized cloud provider that cut spanning-tree loops by 80 percent and slashed provisioning time from days to minutes. The episode explains how EVPN uses MP-BGP to distribute MAC and IP addresses, enabling any-to-any connectivity across leaf...

Episode 86 of Networking Tech with Fexingo digs into segment routing - a modern traffic engineering approach that's replacing decades-old MPLS and RSVP-TE setups. Lucas and Luna walk through how segment routing encodes the entire forwarding path in the packet header, eliminating per-flow state on intermediate routers. They use a real-world example from a large cloud provider that cut network confi...

Lucas and Luna dive into RPKI — Resource Public Key Infrastructure — and how it's fixing BGP's biggest security flaw. They walk through real route hijack incidents, explain why the protocol has been slow to adopt, and share the surprising statistic: as of mid-2026, only about 35 percent of the internet's prefixes are cryptographically signed. They discuss the role of major cloud providers, the ROV...

In this episode of Networking Tech with Fexingo, Lucas and Luna explore Intent-Based Networking (IBN) — the shift from manual CLI configuration to automated policy-driven network management. Using real-world examples from a global retailer that slashed deployment time by 80 percent and avoided a costly outage, they break down how IBN translates business intent into network actions, how it differs...

In this episode, Lucas and Luna dive into the shift from traditional network monitoring to observability pipelines—specifically how platforms like Cribl and Splunk are transforming the way network engineers collect, process, and route telemetry data. They discuss the problem of 'data gravity' where monitoring tools generate more data than can be cost-effectively stored, and how smart pipeline arch...

Lucas and Luna dive into the world of MPLS Traffic Engineering, exploring how internet service providers and large enterprises use explicit routing to move data efficiently. They break down the concept with a concrete example: how a major ISP like Comcast might engineer traffic flows to avoid congested links, reduce latency, and improve reliability. The episode covers the basics of MPLS labels, tr...

In this episode of Networking Tech with Fexingo, Lucas and Luna explore network slicing — a technology that lets operators carve virtual network partitions with guaranteed performance. They break down how 5G network slicing works in practice, using the example of an autonomous mining operation in Western Australia that runs real-time control and safety video on separate slices. Lucas explains the...

In this episode of Networking Tech with Fexingo, Lucas and Luna dive into the rise of SD-WAN and how it's transforming enterprise network architecture. They explain how a Fortune 500 retailer cut connectivity costs by 40 percent by replacing MPLS links with broadband and LTE, while improving application performance. Lucas breaks down the key components: the orchestration plane, the data plane with...