Designing and Building a Custom Linux Router Training Course

Linux Router Fundamentals and Planning for Government

• Reviewing the Role of a Linux Router in Office and Lab Environments for Government
• Understanding WAN, LAN, Gateway, and Basic Traffic Flow for Government Operations
• Identifying Required Interfaces, Packages, and Deployment Assumptions for Government Networks
• Planning IP Addressing, Interface Roles, and Router Services for Government Use

Configuring Network Interfaces with Netplan for Government

• Identifying and Validating Network Interfaces on the Linux Host for Government Systems
• Configuring WAN and LAN Interfaces with Netplan for Government Networks
• Applying Changes with systemd-networkd and Verifying Connectivity for Government Operations
• Enabling Persistent IP Forwarding for Routing in Government Environments

Implementing Routing, NAT, and Basic Firewall Rules for Government

• Understanding Packet Forwarding and Source NAT in a Router Setup for Government Networks
• Creating iptables Rules for NAT and LAN-to-WAN Forwarding for Government Security
• Allowing Return Traffic and Basic Administrative Access for Government Users
• Saving and Restoring Firewall Rules Across Reboots for Government Systems

Providing DHCP and Local DNS with dnsmasq for Government

• Installing and Configuring dnsmasq for the LAN Segment in Government Networks
• Defining DHCP Ranges, Gateway Options, and Upstream DNS Settings for Government Use
• Binding dnsmasq to the Correct Interface and Validating Leases for Government Operations
• Testing Client Address Assignment and Name Resolution for Government Systems

Testing, Troubleshooting, and Hardening for Government

• Verifying End-to-End Connectivity from LAN Clients to the WAN for Government Networks
• Using Common Linux Tools to Inspect Routes, Rules, Interfaces, and Services in Government Environments
• Troubleshooting Common Issues with Forwarding, NAT, and DHCP for Government Systems
• Applying Basic Operational and Security Good Practices for a Router Host in Government Operations

Hands-on Build and Review for Government

• Building a Working Custom Linux Router from a Defined Scenario for Government Use
• Validating Configuration Persistence and Service Startup Behavior for Government Networks
• Reviewing Configuration Files and Recovery Steps for Government Systems
• Summarizing Lessons Learned and Next Steps for Government Operations