What Is A Subnet Mask?

Tuesday, 14. July 2009

So, what is a subnet mask and why do I need one?

This question is always coming up, so I thought it might be a good idea to try and at least give a quick overview.

IP addresses are used to identify your computer on the net. Subnet Masks are used to tell your computer what it should consider as local network traffic, and what it should send off to the gateway for delivery. Here are the basics of network addressing:

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