Eric,

The key is that you will have to route between the subnets. If your
switch is a layer 3 device it should be able to do that for you.
Otherwise you have to go through a router, either with separate physical
interfaces or logical subinterfaces. A router adds a bit of latency, so
you should try to keep the server and workstations that are going to be
communicating a lot on the same subnet.

One of the values in subnetting is keeping broadcast traffic local. It
makes sense to separate workgroups, such as school buildings within a
district, into their own VLANs when there is a lot of communication
between partners, but it makes less sense to place users and their
servers on different VLANs. I don't think it would be a good idea to put
a group of workstatioons and their default printer on different VLANs,
for example.

Steve Barner
South Burlington High School
Cisco Networking Academy 

-----Original Message-----
From: School Information Technology Discussion
[mailto:[log in to unmask]] On Behalf Of Eric Hall
Sent: Monday, July 30, 2007 12:29 PM
To: [log in to unmask]
Subject: Multiple subnets

All - 

OK, we're growing and I think it's time to divide my network into
multiple subnets. I've done some searching around and have not yet come
up with a clear answer.

Specifically, I would hope to divide IP addresses into three subnets:
Servers/Printers ("system"), Workstations, Labs. We do not use DHCP so
that is not an issue. I would need machines on one subnet to
authenticate/file share from a Win2K server on another subnet, and print
by IP to that
("system") subnet as well. Will I need to do more than change the subnet
mask? VLANs on my switch (HP2524)? Other strategies?

Any thoughts or suggestions are welcome. Am I going to get too deep
trying to do this?

Thanks,

Eric Hall
Technology Coordinator
Waterbury/Duxbury Schools
Washington West Supervisory Union
Waterbury, VT
(802) 244-6100

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