Visualising Class C Subnets

24-minute read

I’ve just started learning how to subnet and while there are plenty of resources to help with the calculations and understand the maths I tend to grasp things better if I have some visual representation.

To help, I put together the following table which – I hope – nicely illustrates the patterns of binary 0s and 1s in the 4th octet of a class C IP address and their correlation to the patterns of block sizes, network IDs, host IDs and broadcast addresses of the various subnets. The table is not intended to explain how to calculate subnets nor even to act as a cheat-sheet, but others may find the visual representation helpful.

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Establishing an SSH Tunnel to Remotely Access a Mac Using AFP and VNC

Steve

Networking

11-minute read

The ability to remotely access a computer on a home network while away from home can often prove very useful.

Employing a technique known as SSH (Secure Shell) tunnelling this article describes how to securely access files on a remote computer using AFP (Apple Filing Protocol) and share that computer’s screen using VNC (Virtual Network Computing).

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Resolving a Static Hostname to a Dynamic IP Address Using DynDNS Free

Steve

Networking

4-minute read

There are occasions when we want to make a computer on a home/local area network (LAN) accessible externally on the Internet. For example, remotely connecting to a LAN computer using SSH or remotely accessing a web site residing on a LAN computer.

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Assigning a Locally Networked Computer a Static IP Address in Mac OS X

Steve

Networking

3-minute read

Each computer connected to a local network is assigned a dynamic IP address. On occasion it’s useful, if not essential, to assign a static IP address instead. As an example, port forwarding requires the destination computer on a local network to have a static IP address.

Using OS X Lion 10.7.1, I’ll describe two ways of assigning a static IP address to a computer on a local network.

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Networking