Re: Subnet recommendations for a multi-site network


"Dave Fitton" <DaveFitton@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:EA741960-69A5-41BD-8AEA-066E02165CC4@xxxxxxxxxxxxxxxx
Our college is shortly to be merged with an other college and the 2 IT
teams
are working on a IP addressing scheme that will best fit for a merged
network

Current setup is:

College A - uses a single 10.1.0.0 /255.255.0.0 class B type subnet on a
single site - around 900 client PCs - both admin and student PC on same
subnet
College B - uses a 10.0.0.0/255.248.0.0 for the student network and
172.16.0.0/255.255.0.0 for the admin network. Both these subnets span a
100MB
link between 2 sites - both with around 450 PCs each

We need a scheme that will work for the merged college across 3 sites in
total

My solution for the merged 3-site college would be to use

1. Single subnets for each site - eg
10.1.0.0 /255.255.0.0 for site 1,
10.2.0.0 /255.255.0.0 for site 2,
10.3.0.0 /255.255.0.0 for site 3
2. 100mb links between the sites

My questions are:

a) Does this look a feasible solution
b) Is subnetting a Class A network into Class B type subnets the
recommended/easiest way to subnet a Class A - a subnet mask of 255.252.0.0
has been suggested
c) Should all internal clients use the same Network address - in has been
suggested that 10 range and 172 range be kept

Any suggestions welcomed

Thanks

Dave F


That sounds sensible to me. I can't see any reason to use a subnet mask
shorter than 16 bits. I can't imagine a site outgrowing the capacity of a
10.x.0.0/16 subnet .

I can't see any reason to stay with the 172.16 . On the other hand
there is no real reason to change it if it means a lot of work, but it
would look tidier if they were all 10.x.0.0/16 as you suggest.

How are the machines split up within sites? Surely the 900 odd machines
are not all in the same broadcast domain?


.

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