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IP Sub-Networking Mini-Howto

Robert Hart, hartr@interweft.com.au

v1.1, 30 August 2001

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This document describes why and how to subnetwork an IP network - that is using a single A, B or C Class network number to function correctly on several interconnected networks.

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1. Copyright

2. Introduction

• 2.1 Other sources of information

3. The Anatomy of IP numbers

• 3.1 IP numbers belong to Interfaces - NOT hosts!
• 3.2 IP Numbers as "Dotted Quads"
• 3.3 Classes of IP Networks
• 3.4 Network numbers, interface addresses and broadcast addresses
• 3.5 The network mask

4. What are subnets?

5. Why subnetwork?

6. How to subnetwork a IP network number

• 6.1 Setting up the physical connectivity
• 6.2 Subnetwork sizing
• 6.3 Calculating the subnetwork mask and network numbers

7. Routing

• 7.1 The routing tables

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