The First Ping

Lesson 6 of 35 in Coddy's LAN Labs course.

With addresses in the same network and a switch between them, two hosts reach each other directly: no router involved. netlab ping A B simulates that exchange and, on success, prints the reply with a TTL of 64, the value a packet starts with when it has not crossed any router.

Reachability is a two-way street. A ping only succeeds when the request arrives and the reply finds its way back, so try both directions when you test a lab.

Challenge

Beginner

Both hosts are addressed in 192.168.1.0/24. Ping pc2 from pc1, then pc1 from pc2.

Expected output:

pc1 -> pc2: reply from 192.168.1.20 (ttl=64)
pc2 -> pc1: reply from 192.168.1.10 (ttl=64)

Try it yourself

Terminal

All lessons in LAN Labs

1Meet the Lab

Your First Lab Cables Wires Are Not Enough Recap - Build a Lab

4Routers and Gateways

Two Networks The Default Gateway Both Sides Need a Way Back Routing Tables Recap - Connect the Floors

7Growing the Office

The Plan Sales Comes Online Engineering Joins Gateways Everywhere Recap - The Printer

2Addresses on the LAN

Giving a Host an AddressThe First PingWhat ARP Learned The Switch Learns Too Recap - First Conversation

5Troubleshooting I

The Unplugged Host The Missing Gateway The Typo in the Mask Recap - Two Faults

8Capstone - Fix the Branch

Survey the Damage Fix the Address Clash Masks and Gateways Recap - Prove It Works

3Masks Matter

Wrong Mask, No Reply Same Switch, Other Subnet Let check Do the Looking Recap - Diagnose the Pair

6Troubleshooting II

Two Devices, One Address The Network Address Trap Gateway on the Wrong Subnet Recap - The Silent Router

Practice on your own: Terminal playground