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Course Outline
Linux Router Fundamentals and Planning
- Examining the role of a Linux router in office and lab environments.
- Gaining an understanding of WAN, LAN, gateways, and fundamental traffic flow.
- Identifying necessary interfaces, packages, and deployment assumptions.
- Planning IP addressing, interface roles, and router services.
Configuring Network Interfaces with Netplan
- Identifying and validating network interfaces on the Linux host.
- Configuring WAN and LAN interfaces using netplan.
- Enabling persistent IP forwarding for routing.
Implementing Routing, NAT, and Basic Firewall Rules
- Understanding packet forwarding and source NAT within a router setup.
- Creating iptables rules for NAT and LAN-to-WAN forwarding.
- Permitting return traffic and basic administrative access.
- Saving and restoring firewall rules across reboots.
Providing DHCP and Local DNS with dnsmasq
- Installing and configuring dnsmasq for the LAN segment.
- Defining DHCP ranges, gateway options, and upstream DNS settings.
- Binding dnsmasq to the appropriate interface and validating leases.
- Testing client address assignment and name resolution.
Testing, Troubleshooting, and Hardening
- Verifying end-to-end connectivity from LAN clients to the WAN.
- Utilising common Linux tools to inspect routes, rules, interfaces, and services.
- Troubleshooting common issues related to forwarding, NAT, and DHCP.
- Applying basic operational and security best practices for a router host.
Hands-on Build and Review
- Constructing a functional custom Linux router from a defined scenario.
- Validating configuration persistence and service startup behaviour.
- Reviewing configuration files and recovery procedures.
- Summarising lessons learned and outlining next steps.
Requirements
- A solid understanding of basic TCP/IP networking principles, including IP addressing, subnets, and default gateways.
- Familiarity with 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.
14 Hours
Testimonials (1)
communication, knowledge from experience, solve problems,
