0 views collected around this technical thread.
This guide introduces the kubectl sniff plugin for Kubernetes, explains its non‑privileged and privileged modes, walks through installation via krew or offline, and provides step‑by‑step commands to capture pod traffic with tcpdump and view it in Wireshark, enhancing network debugging efficiency.
This guide explains how to verify physical links, test ping latency, trace routes, check HTTP/HTTPS availability with wget and curl, assess TCP/UDP ports using netcat, telnet, and nmap, inspect local connections via netstat/ss, understand TCP states, and validate DNS resolution, providing practical command examples for each step.
Learn step‑by‑step how to configure iptables to log all dropped inbound and outbound packets to syslog, including creating a LOGGING chain, setting rate limits, customizing log prefixes, directing logs to a specific file, and interpreting the resulting log entries.
Learn how to install nslookup on Debian/Ubuntu and CentOS/RHEL, then explore seven practical commands for querying IP addresses, specifying DNS servers, retrieving specific record types, performing reverse lookups, setting search domains, using the set command, and exiting the tool.
This guide explains what traceroute does, how to install it on various Linux distributions, and provides detailed command syntax, common and advanced options, practical examples, and important precautions for effective network troubleshooting.
Learn how to install the traceroute utility on Debian/Ubuntu and CentOS/RHEL systems, understand its basic command syntax, explore common and advanced options, and see practical examples for network path tracing, while noting important considerations and usage tips.
This article explains the roles of Ethernet MAC and PHY layers, outlines typical hardware and software problems such as connection faults, power instability, and driver misconfigurations, and provides detailed troubleshooting steps and best‑practice solutions to restore reliable network communication.
This guide walks through typical Linux operational problems—including boot failures, network issues, MBR and GRUB errors, forgotten root passwords, and read‑only file‑system symptoms—explaining their causes, step‑by‑step diagnostic methods, and practical recovery commands to restore a healthy system.
This guide walks through typical Linux operational problems—including boot failures caused by fstab errors, root‑filesystem corruption, missing kernel files, MBR or GRUB issues, network hardware and configuration faults, DNS mis‑settings, service port problems, forgotten root passwords, and read‑only file‑system errors—providing step‑by‑step troubleshooting methods and command‑line fixes.
This article walks through a production‑level OceanBase connection‑timeout incident, detailing how to examine OBProxy logs, capture and analyze network packets with tcpdump and Wireshark, identify a blocked random port, and apply kernel‑parameter fixes to prevent the issue.
A series of QA deployment failures caused by rsync errors revealed that network instability, missing timeouts, and zombie processes can break file synchronization, and adding a timeout option together with network diagnostics can mitigate the issue.
The intermittent timeout between cloud host A and game server B was traced to the server’s net.ipv4.tcp_tw_recycle setting, which dropped SYN packets with non‑monotonic timestamps after NAT translation, and disabling this kernel parameter restored normal connectivity.
This article provides an in-depth review of common Java backend interview questions, covering alternative object creation methods, practical reflection scenarios, serialization techniques, garbage‑collection algorithms, I/O multiplexing mechanisms, network port listening, and troubleshooting tips for server‑client communication issues.
The article details how a Go service’s 300‑second Redis call timeout was traced to a gateway’s full‑NAT session‑table loss, and explains how targeted retries, proper timeout settings, and rate‑limiting can prevent similar cascading failures in distributed systems.
This article explains the traceroute command’s working principle, details its many options, provides practical usage examples, and presents two real‑world troubleshooting cases that illustrate how traceroute can locate misconfigurations, asymmetric paths, and routing loops in Linux networks.
This article introduces a systematic approach for troubleshooting Kubernetes pod network problems, covering common failure models, essential diagnostic tools such as tcpdump, nsenter, paping and mtr, and detailed case studies that illustrate step‑by‑step analysis and resolution techniques.
The SRE team diagnosed an in‑flight Wi‑Fi outage for the DeWu e‑commerce app by reproducing the problem, capturing packets with ping, traceroute and tcpdump, discovered a firewall rule misclassifying the domain as a download site, and resolved it through a vendor‑issued policy update, restoring connectivity on both ATG and SATCOM links.
This article introduces a systematic approach to diagnosing Kubernetes pod network issues, classifies common failure types, presents essential tools such as tcpdump, nsenter, paping and mtr, outlines a step‑by‑step troubleshooting workflow, and walks through several real‑world case studies to illustrate the process.
A network engineer recounts a terrifying core switch outage caused by an SSD firmware bug, describes the emergency troubleshooting steps, the eventual fix through firmware upgrade, and urges manufacturers to adopt recall mechanisms for critical network equipment.
This article explains TCP connection states, common Linux network commands, the three‑way handshake, four‑way termination, simultaneous open/close, flag meanings, and practical troubleshooting techniques such as keep‑alive and error handling, providing a comprehensive guide for network engineers.