networking Archives

Networking tutorial - IT technology blog

Configuring ECMP Routing on Linux: Load Balance Multiple Gateways with iproute2

July 19, 2026

Don't let your backup ISP link sit idle. Learn how to use ECMP with iproute2 to load balance traffic across multiple gateways for better speed and reliability.

Networking

Scaling Traffic with Linux Virtual Server (LVS): High-Performance Layer 4 Load Balancing

July 19, 2026

Ditch user-space bottlenecks. Master LVS/IPVS to build high-performance Layer 4 load balancers using NAT and Direct Routing for massive scalability.

DevOps

Kubeshark Tutorial: Real-time Kubernetes API Traffic Analysis and Microservices Debugging

July 18, 2026

Struggling with Kubernetes network errors? Learn how to use Kubeshark for agentless, real-time API traffic analysis and gRPC debugging.

Networking

4G/5G USB Modem Failover on Ubuntu Server with ModemManager and NetworkManager

July 17, 2026

After three fiber outages in six months, I configured automatic 4G/5G USB modem failover on Ubuntu Server using ModemManager and NetworkManager. Six months later, it's handled seven more disruptions without a single manual action — here's the exact setup I'm still running in production.

Networking

Taming the Linux Conntrack Table: A Guide to Netfilter State Tracking

July 5, 2026

Is your Linux server dropping packets? It might be a full conntrack table. Learn how to tune nf_conntrack_max, adjust TCP timeouts, and troubleshoot NAT issues.

Networking

Self-Hosted VoIP PBX with FreePBX and Asterisk on Linux: From Zero to Working SIP Trunk

June 30, 2026

Running your own VoIP PBX with FreePBX and Asterisk cuts costs sharply and puts you in full control of your phone system. This guide covers installation on Linux, connecting a SIP trunk to the outside world, setting up internal extensions, and fixing the one-way audio problem that catches almost every first-time build.

Networking

High-Speed Packet Processing with DPDK on Linux: Installation and Building Your First Network App

June 29, 2026

DPDK bypasses the Linux kernel network stack entirely, letting userspace applications process packets at line rate using poll mode drivers. This guide covers installation, hugepage configuration, NIC binding, building the l2fwd example, and production tuning tips for CPU isolation and NUMA awareness.

Networking

Deep pcap Analysis with tshark on Linux: Filter Protocols, Extract Fields, and Generate Traffic Statistics

June 19, 2026

tshark puts Wireshark's full dissection engine on the command line — the right tool for analyzing pcap files on remote servers or inside CI pipelines. This guide covers protocol filtering with display filters, extracting named fields into tab-separated output, and generating traffic statistics without opening a GUI.

Networking

Securing BGP with RPKI: Configure Route Origin Validation and Register ROAs to Stop BGP Hijacking

June 19, 2026

BGP hijacking has disrupted major internet services repeatedly — and most incidents could have been prevented with RPKI. This guide walks you through registering ROA records with your RIR and enabling Route Origin Validation on FRRouting to stop unauthorized prefix announcements before they cause damage.

Networking

IS-IS on Linux: Why ISPs Choose It Over OSPF (and How to Configure It)

June 18, 2026

Discover why IS-IS is the backbone of the modern internet. This guide shows you how to configure IS-IS on Linux using FRRouting for massive scalability and better security than OSPF.