Network Archives - Page 13 of 13 - ITFROMZERO

How to Use nmap for Network Scanning and Linux Server Security Auditing

By IT From Zero March 6, 2026

A practical guide to using nmap for port scanning, service detection, and Linux server security auditing — drawn from real infrastructure management experience. Covers basic commands, NSE scripts, and an automation script for weekly audits.

Network

Configuring IPv6 on Linux Servers: Static Addresses, Dual-Stack, and Real-World ip6tables

By IT From Zero March 2, 2026

Step-by-step guide to configuring IPv6 on Linux servers: enabling IPv6, assigning static addresses on Ubuntu/Debian and CentOS/Rocky, setting up dual-stack, ip6tables firewall, and troubleshooting real-world issues.

Network

Network Bonding on Linux: Configure Bandwidth Aggregation and Automatic Failover for Servers

By IT From Zero February 28, 2026

Network bonding combines multiple physical network cards into a single logical interface, ensuring automatic failover when a card fails and increasing server bandwidth. This guide covers practical configuration on Ubuntu (netplan) and CentOS/RHEL (nmcli), complete with failover testing and monitoring.

Network

netstat vs ss: Analyzing Network Connections and Listening Ports on Linux

By IT From Zero February 28, 2026

A hands-on comparison of netstat and ss from real-world production server management — pros and cons of each tool, using ss for listening ports, filtering connections by IP, and debugging abnormal traffic in the middle of a live incident.

Network

Setting Up a DNS Server with Bind9 on Ubuntu/Debian

By IT From Zero February 28, 2026

A step-by-step guide to setting up an internal DNS server with Bind9 on Ubuntu/Debian: installation, forward and reverse zone files, forwarder and ACL configuration, testing, and troubleshooting. Written from real-world experience managing an office network.