Network Troubleshooting – ITFROMZERO

ethtool Linux: Check NIC Status, Configure Speed, and Optimize Network Interface Performance from the Command Line

By admin July 20, 2026

ethtool is the Linux command that shows you everything about your NIC that ip link can't — from actual speed/duplex and error counters to ring buffer and offloading. Includes a full-server NIC health check script and how to persist settings across reboots.

Network

Mastering hping3: Advanced Techniques for Firewall Bypassing and Deep Network Diagnostics on Linux

By admin June 10, 2026

Don't be fooled by the Ping command. Learn how to use hping3 to craft custom packets, bypass firewalls, and perform deep network diagnostics like a pro SysAdmin.

Network

Diagnosing and Troubleshooting Network Connectivity Issues on Linux: A Guide to `ip`, `route`, `dig`, `netcat`, and More

By admin March 28, 2026

Network connectivity issues on Linux servers can arise unexpectedly, causing significant disruption. This article guides you through using powerful tools like `ip`, `route`, `dig`, and `netcat` to systematically diagnose and resolve problems, just as you would handle a real-world production incident.