IP Sub-Networking Mini-Howto: What are subnets?
A subnet is a way of taking a single IP network address and locally
splitting it up so that this single network IP address can actually be
used on several interconnected local networks. Remember, a single IP
network number can only be used on a single network.
The important word here is locally: as far as the world outside the
machines and physical networks covered by the sub-netted IP network are
concerned, nothing whatsoever has changed - it is still just a single IP
network. This is important - sub-networking is a local configuration
and is invisible to the rest of the world.
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