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From: David Schwartz on 21 Apr 2008 04:51
On Apr 19, 12:07 pm, "Piotrek G."
> Maybe it's a lame question but... Why I can't wire two subnets together?
> Isn't subneting invented to separate two or more networks connected
> together? It works perfectly without a router and, I think, it's desired
> solution in some circumstances, isn't it?

The short answer -- no. Subnetting was *not* designed to separate two
or more networks connected together. It was to make it possible to
separate two or more networks and have them communicate with each
other.

If you choose to put more than one subnet on the same virtual network,
you will not be able to prevent machines from talking to each other.
It takes active steps at every possible pathway two machines could use
to talk to each other to keep them from talking to each other, and you
can't do that on a physical wire without using VLANs or a similar
scheme.

You may get it to work for a bit, and then suddenly the machines find
some other way to talk to each other.

DS
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