The article explains why a failed ping does not always indicate a network outage, outlines common failure scenarios, and provides a step‑by‑step guide to using traceroute and mtr—including parameters, output interpretation, real‑world case studies, and a complete troubleshooting workflow for network engineers.
A two‑day investigation of intermittent packet loss in a hybrid‑cloud Kubernetes environment revealed that an oversized VXLAN MTU caused fragmentation, prompting a step‑by‑step analysis of MTU fundamentals, diagnostic commands, Cilium configuration changes, and best‑practice recommendations for cloud‑native networks.
This article walks through how packet loss can occur at any layer of the Linux network stack, demonstrates using ethtool, netstat, iptables, tc and tcpdump to locate the issue, and shows how adjusting MTU and removing a netem rule fully resolves the problem.
A production incident showed that despite flawless frontend health metrics and no logged errors, a subset of users experienced 504 Gateway Timeout errors caused by an MTU mismatch in the network path, highlighting the need for end‑to‑end connectivity checks beyond application monitoring.
This article walks through a systematic Linux network‑troubleshooting process, examining packet loss at every protocol‑stack layer, using tools such as netstat, ethtool, iptables, tc, and tcpdump, and ultimately fixing the issue by removing a faulty netem rule and correcting the MTU size.
This article walks through a systematic Linux network packet‑loss investigation, covering potential loss points across the protocol stack, using ethtool, netstat, iptables, tc netem, and MTU adjustments, and demonstrates how to verify and resolve the issue with hping3 and curl.
This article walks through a systematic Linux network packet‑loss investigation, covering every protocol layer from the NIC to the application, analyzing ethtool, netstat, tc, iptables rules, MTU settings, and finally applying fixes to restore reliable connectivity.
This article explains Bluetooth Low Energy fundamentals, compares classic and BLE, describes BLE mesh networking, provides a complete bleno example for peripheral simulation, and details advertising, scanning, connection flow, MTU negotiation, fragmentation, and sticky‑packet handling on Android and iOS.
The article walks through a real‑world case where an app’s content fails to load due to MTU/MSS mismatches, explains how packet‑capture analysis reveals the problem, demonstrates ping‑based MTU testing, and shows how oversized API parameters triggered the failure.
This article walks through a real‑world case where an app’s content loading fails due to MTU/MSS mismatches, explains how packet captures reveal retransmissions and missing ACKs, demonstrates ping‑based MTU probing, and shows how oversized request parameters in a new version caused the issue.
The investigation used Wireshark captures to uncover that a new app version sent oversized TCP segments—due to altered MSS and path‑MTU mismatch—causing unacknowledged retransmissions, which were diagnosed with ping‑do‑not‑fragment tests and resolved by trimming the request parameters and confirming via TLS key logging.
When running Jenkins inside a Docker container on a VM, HTTPS requests to accounts.google.com time out due to an MTU mismatch between the host and the container, which can be resolved by adjusting the MSS via iptables or setting a lower MTU for Docker interfaces.
Although a 1 GbE (1000 Mbps) link theoretically transfers 125 MB per second, real‑world speeds are lower due to protocol overhead, Ethernet framing, and MTU limits; understanding binary prefixes, frame structure, and employing jumbo frames can significantly improve effective throughput.
This article explains the difference between decimal and binary data units, how Ethernet frame overhead and protocol headers reduce the theoretical 125 MB/s throughput of a 1 Gbps link, and how increasing the MTU with jumbo frames can improve efficiency.
This guide outlines a systematic approach to troubleshooting Kubernetes pod network problems, covering failure models, essential tools like tcpdump, nsenter, paping, and mtr, and detailed case studies that illustrate root cause analysis and remediation steps.
This guide walks through identifying severe packet loss affecting Nginx, using hping3, netstat, ethtool, iptables, and tcpdump, then resolves the issue by removing a faulty netem rule and correcting an MTU misconfiguration, ultimately restoring normal HTTP responses.
This guide walks through identifying where packet loss occurs in the Linux network stack, using tools like hping3, netstat, tc, iptables and tcpdump, and demonstrates step‑by‑step fixes such as removing netem rules, adjusting MTU and verifying HTTP responses.
This article explains how an improperly configured MTU in a VPN environment caused MySQL SHOW DATABASES commands to hang, details the troubleshooting steps taken, and presents three practical solutions to resolve the MTU‑related packet loss.
This article introduces a systematic approach to troubleshooting Kubernetes pod network issues, covering common failure types, essential diagnostic tools like tcpdump, nsenter, paping, and mtr, and detailed case studies that illustrate step‑by‑step analysis and resolution of real‑world connectivity problems.
This article introduces a systematic approach to troubleshooting Kubernetes pod network anomalies, covering classification of common failures, essential tools such as tcpdump, nsenter, paping and mtr, detailed packet‑capture techniques, a step‑by‑step troubleshooting workflow, and real‑world case studies to illustrate root‑cause analysis and resolution.
This article provides a comprehensive guide to TCP, covering its definition, connection-oriented nature, reliability, byte‑stream model, detailed packet header fields, three‑way handshake, four‑way termination, MTU/MSS concepts, Python simulation scripts, Wireshark capture techniques, common pitfalls, and practical networking programming steps.
This article explains the structure of Linux network I/O by detailing the OSI seven‑layer model, the role of each layer, MTU/PMTU concepts, IP fragmentation and reassembly, and key TCP mechanisms such as MSS, flow control, and congestion control, providing a comprehensive foundation for studying zero‑copy networking.
This article explains why a single recursive DNS query to a root server returns only 13 IP addresses by examining DNS packet structure, MTU constraints, UDP/TCP transport limits, and the 512‑byte size restriction that governs DNS responses.
This article explains why the Ethernet maximum transmission unit (MTU) settled on 1500 bytes, covering early hardware constraints, cost considerations, the emergence of jumbo frames, modern traffic analysis, and why changing this long‑standing value remains difficult.
Despite China's push for IPv6, mobile devices face uneven dual‑stack support, with iPhone and Android handling APN settings, carrier configurations, address allocation, Happy Eyeballs selection, NAT, MTU and firewall nuances, revealing practical challenges and technical details of IPv6 deployment on mobile networks.
