Netpractice 42 Tutorial

NetPractice is a small, private network administration exercise designed to introduce students to TCP/IP addressing and subnetting. It consists of 10 levels of increasing difficulty. The goal is to fix broken networks by configuring IP addresses, subnet masks, and routing tables.

This guide covers the core concepts you need to understand to solve all 10 levels. netpractice 42 tutorial

Scenario: Two networks separated by one router. Task: PC1 on Network A to PC2 on Network B. Solution: Scenario: Two networks separated by one router

Key insight: The gateway IP must be on the same subnet as the PC. On PC1: IP 192

| Symptom | Likely Cause | Fix | | :--- | :--- | :--- | | "Destination unreachable" | No route back | Check return path routing table | | No ping between same switch | Different subnets | Change IP or mask to match | | Can't reach internet | Missing default gateway | Add 0.0.0.0/0 route on edge router | | Router config fails | IP overlaps another network | Recalculate subnet boundaries | | IP rejected by interface | Network ID or broadcast used | Use a host address in range |

Sometimes you have multiple networks behind one router. Instead of adding three routes, add one summary route.