85: George is Asleep

60 Seconds of WIP · Apr 17, 2025 · 1m

Here’s some of the new Networking for System Administrators, because while the Laserblasted Kickstarter ends today I am utterly sick of shilling it.

Think of the network as a conference room. At the physical layer you have a table and chairs. The room is a broadcast domain. Each chair is a host, with a unique MAC address.

As an IP network, the table can hold a number of chairs equal to a power of two. Each chair has a unique IP address. Two of the chairs, the top and bottom addresses, are rickety and dangerous to use. Nobody sits in the chair by the door, as that’s the default gateway.

ICMP…