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

Lucas and Luna dive into BGP Flowspec, a protocol extension that lets network operators filter traffic at line rate during DDoS attacks. They trace how Flowspec evolved from academic papers to production use at major cloud providers, walk through a real-world mitigation example where a single rule dropped 95% of malicious traffic in under 30 seconds, and discuss why adoption remains patchy despite...

Lucas and Luna explore how modern network automation frameworks reduce router configuration time by up to 90 percent compared to CLI-based manual processes. They walk through a real-world case: a regional ISP that cut configuration errors by 80% after adopting Ansible and Nornir for device provisioning. The hosts explain the difference between imperative and declarative automation, discuss YAML-ba...

Lucas and Luna dive into NetFlow and IPFIX, the unsung heroes of network traffic analysis. Using a real-world example of a mid-size e-commerce company that discovered a rogue cryptocurrency miner through NetFlow data, they explain how flow records differ from packet capture, why IPFIX standardized the protocol, and how modern network engineers use these tools for security, capacity planning, and t...

Episode 76 of Networking Tech with Fexingo dives into eBPF, the kernel technology that gives network engineers unprecedented visibility into traffic flows without changing application code. Lucas and Luna walk through the network observability startup Cilium and its eBPF-based approach to service mesh and security policies at scale. They discuss how companies like ByteDance and Capital One use eBP...

Episode 75 of Networking Tech with Fexingo digs into Network Time Protocol (NTP) and Precision Time Protocol (PTP) — the invisible infrastructure that keeps financial exchanges, 5G networks, and power grids in sync. Lucas and Luna break down the June 2026 SEC mandate requiring all US stock exchanges to achieve microsecond-level timestamp accuracy, using real examples like the 2012 Knight Capital t...

Episode 74 of Networking Tech with Fexingo dives into a question network engineers are wrestling with in mid-2026: as low-Earth-orbit satellite constellations from Starlink, OneWeb, and Kuiper grow to tens of thousands of satellites, how does internet routing adapt? Lucas and Luna break down the specific challenge of inter-satellite laser links — currently around 9,000 active links in orbit — and...

Lucas and Luna dive into streaming network telemetry — how real-time data from routers and switches, pushed via gRPC and protobuf, is replacing old-school SNMP polling. They unpack a specific case: how one large cloud provider caught a microburst-induced packet loss event within 200 milliseconds using open-config model-driven telemetry, versus the 5-minute polling gap that would have missed it ent...

Episode 72 of Networking Tech with Fexingo explores how low-earth-orbit satellite constellations like Starlink are forcing fundamental changes in Internet routing. With satellites moving at 7.5 km/s and handing off connections every few minutes, traditional BGP and TCP protocols break down. Lucas and Luna dive into the specific engineering challenges: laser crosslinks that create a mesh in orbit,...

Lucas and Luna explore how private 5G networks are reshaping connectivity for large campuses, factories, and ports. They focus on a real-world implementation at the Port of Rotterdam, where a private 5G network from Ericsson and KPN supports autonomous cranes, drone inspections, and real-time logistics. The hosts break down why private 5G offers lower latency, higher reliability, and better securi...

Episode 70 of Networking Tech with Fexingo explores network digital twins—virtual replicas of production networks used to simulate changes, test configurations, and predict failures before they impact users. Lucas and Luna break down how AT&T and Microsoft are deploying digital twins to reduce planned maintenance windows by 70 percent and prevent capacity-related outages. They walk through a concr...

Episode 69 of Networking Tech with Fexingo. Lucas and Luna explore how Smart NICs (network interface cards with onboard processors) are offloading packet processing from CPU cores, reducing latency and freeing up server resources for applications. They focus on the rise of NVIDIA's BlueField DPU, the impact on hyperscaler data centers like Microsoft Azure, and how Smart NICs enable software-define...

Episode 68 of Networking Tech with Fexingo dives into Time-Sensitive Networking (TSN), the IEEE standard bringing deterministic Ethernet to factories and autonomous systems. Lucas and Luna unpack a real deployment at a BMW plant in Dingolfing, Germany, where TSN slashed jitter from 500 microseconds to under 10 microseconds across welding robots. They explain how TSN's traffic shaping and gating me...

Episode 67 of Networking Tech with Fexingo explores how network engineers are using SaltStack, an open-source automation framework originally designed for server configuration, to manage routers and switches. Lucas and Luna break down a real deployment at a mid-sized enterprise that cut device provisioning time from 45 minutes to under 3 minutes. They discuss the push-vs-pull model, how Salt's eve...

This episode of Networking Tech with Fexingo dives into eBPF (extended Berkeley Packet Filter), a technology that lets network engineers run sandboxed programs in the Linux kernel without changing kernel code or loading modules. Lucas and Luna explain how eBPF enables deep observability into network traffic, security events, and performance metrics with minimal overhead — used by companies like Ne...

In this episode, Lucas and Luna dive into Segment Routing over IPv6, or SRv6, a technology that is transforming how service providers and large enterprises design and operate wide area networks. They explain how SRv6 embeds a list of instructions directly into the IPv6 packet header, eliminating the need for complex MPLS labels and multiple protocols. The hosts walk through a real-world example fr...

DNS-over-HTTPS, or DoH, encrypts DNS queries to prevent eavesdropping and manipulation. But it also shifts DNS resolution from the network to the client, breaking traditional security monitoring. Lucas and Luna explore how DoH works, why browsers like Chrome and Firefox adopted it, and what it means for network engineers trying to enforce filtering or detect malware. They focus on the real-world t...

In this episode of Networking Tech with Fexingo, Lucas and Luna dive into Resource Public Key Infrastructure (RPKI) — the cryptographic framework that prevents BGP hijacks and route leaks. They explain how RPKI works with Route Origin Authorizations (ROAs) to validate IP prefix ownership, using the 2024 and 2025 hijack statistics from MANRS to show why adoption matters. They also highlight real-wo...

In this episode of Networking Tech with Fexingo, Lucas and Luna explore intent-based networking (IBN) — a paradigm shift where network operators declare what they want the network to do, and the system automatically configures, monitors, and adjusts to meet that intent. They break down how IBN goes beyond traditional automation by adding closed-loop verification, using real examples like Cisco's D...

Episode 61 of Networking Tech with Fexingo dives into network verification—why even a single misconfigured BGP prefix can take down a global bank for hours. Lucas and Luna walk through the 2024 outage at a major European bank caused by a missing route-target import statement, then explore how formal verification tools like Batfish and forward- and backward-annotation logic are catching errors befo...

Episode 60 of Networking Tech with Fexingo dives into Passive Optical LAN (POL) — a fiber-to-the-desk architecture that replaces traditional copper Ethernet in large buildings. Lucas explains how a single fiber strand from an Optical Line Terminal (OLT) can serve up to 128 endpoints via passive splitters, slashing cabling and power costs. He cites a real case: a 500,000-square-foot hospital that s...

In this episode of Networking Tech with Fexingo, Lucas and Luna dive into Zero Touch Provisioning (ZTP) — the automation framework that lets network engineers deploy switches and routers without manual CLI configuration. They break down the real-world workflow using a concrete example: a retail chain rolling out 500 edge switches across 200 stores in three months. The conversation covers the role...

Segment Routing over IPv6 (SRv6) is reshaping how service providers and large enterprises build their wide-area networks. In this episode, Lucas and Luna explore a real-world deployment at a major European telecom that cut provisioning time from weeks to minutes. They explain how SRv6 embeds routing instructions directly into the IPv6 header, replacing the complexity of MPLS with a simpler, more p...

In this episode of Networking Tech with Fexingo, Lucas and Luna dive into intent-based networking (IBN) — a paradigm shift where network operators declare what they want the network to do, and software translates that intent into configuration, deployment, and continuous verification. They explore a concrete example: how a large financial services firm, JPMorgan Chase, has been using Cisco's IBN p...

Episode 56 of Networking Tech with Fexingo dives into network slicing, the technology that carves virtual private networks out of a single physical infrastructure. Hosts Lucas and Luna explore how Ericsson and Deutsche Telekom deployed a slice for a factory automation use case in 2025, achieving 99.9999% reliability on a shared 5G transport network. They break down how slicing works at the routing...

Lucas and Luna unpack Segment Routing (SR-MPLS), the technology that lets network operators define explicit paths through a wide area network without maintaining per-flow state on intermediate routers. They walk through the classic problem — traffic engineering on large MPLS networks requires hundreds of label-switched paths and constant signalling — and show how SR replaces that with a single sou...