Your question is a little confuse but let me tell what I understood from it:
usually what is done is subnetting with a masks that is enough to
accommodate the number of hosts you have on each of your networks. But if
you use one /24 entire subnet for the serials links, for instance, you will
be wasting many ip addresses, since a serial link only uses two of them.
What is done in this case is to take one or more of your original subnets
and divide them into many /30 subnets to be used just for the links. In this
way you will be using just one (or two) of your initial subnets to the
links. Note that you will be using VLSM which means that there will be
networks with different address mask lengths. This is not supported by all
routing protocols: just classless protocols support it (RIP V2, EIGRP,
OSPF). Classfull protocols (RIP V1 and IGRP) don't support it. So this must
be planned with care.
ER
CCNA
----- Original Message -----
From: "SH Wesson"
To:
Sent: Friday, June 22, 2001 10:46 AM
Subject: Subnet usage [7:9509]
Got a question re: subnet usage. I'm using /30 to subnet 10.100.1.x so that
I only have two addresses per subnet. The question is, there will be
approximately subnets and two hosts per subnet if I subnet it this way.
Now, does it make sense to scatter these subnets everywhere (Site 1, Site 2,
Site 3 ... Site X or should I keep it at one site and use the other subnets
on that for other use at that site?
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