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Recap - Diagnose the Pair

Lesson 13 of 35 in Coddy's LAN Labs course.

Challenge

Easy

Hosts a and b share switch s. Host a is 10.0.0.5/24 with gateway 10.0.0.1; host b was configured wrong. Run the check, fix b by giving it 10.0.0.6/24, then ping b from a.

Expected output:

ERROR b: gateway 10.0.0.1 is outside its subnet 10.0.1.0/24
Lab check: 1 problem(s) found
b eth0: 10.0.0.6/24 (mask 255.255.255.0, network 10.0.0.0/24)
a -> b: reply from 10.0.0.6 (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 Address The First Ping What 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 LookingRecap - 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