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 Duration 14 hours

Course Outline

Linux Router Fundamentals and Strategic Planning

  • Examining the operational role of a Linux router within office and laboratory contexts
  • Analyzing Wide Area Network (WAN), Local Area Network (LAN), gateway functions, and fundamental traffic routing
  • Specifying essential interfaces, software packages, and deployment prerequisites
  • Designing IP addressing schemes, interface assignments, and router service configurations

Network Interface Configuration via Netplan

  • Discovering and verifying network interfaces on the Linux host system
  • Configuring WAN and LAN interfaces using Netplan directives
  • Activating persistent IP forwarding capabilities for routing operations

Implementing Routing, NAT, and Fundamental Firewall Controls

  • Comprehending packet forwarding mechanics and source Network Address Translation (NAT) in router architectures
  • Establishing iptables rules for NAT and LAN-to-WAN traffic forwarding
  • Permitting return traffic and essential administrative access
  • Persisting firewall rules to ensure consistency across system reboots

Provisioning DHCP and Local DNS Services via dnsmasq

  • Installing and configuring dnsmasq for the Local Area Network segment
  • Defining DHCP address pools, gateway parameters, and upstream DNS settings
  • Binding dnsmasq to the designated interface and validating lease assignments
  • Testing client IP address acquisition and name resolution processes

Testing, Diagnostics, and System Hardening

  • Validating end-to-end connectivity from LAN clients to the WAN edge
  • Employing standard Linux utilities to inspect routing tables, firewall rules, interfaces, and services
  • Diagnosing and resolving common issues related to forwarding, NAT, and DHCP services
  • Implementing fundamental operational and security best practices for router hosts

Practical Implementation and Post-Configuration Review

  • Constructing a functional custom Linux router based on a defined scenario
  • Verifying configuration persistence and service startup behaviors
  • Auditing configuration files and documenting recovery procedures
  • Summarizing key takeaways and identifying subsequent steps

Requirements

  • Proficiency in basic TCP/IP networking concepts, including IP addressing, subnetting, and default gateway configuration
  • Familiarity with basic Linux command-line administration and experience editing configuration files
  • General experience in Linux system administration

Audience

  • Linux system administrators
  • Network administrators
  • IT support and infrastructure engineers

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