Mailinglist Archive: opensuse-edu (108 mails)

[Andrew RAY <aray@xxxxxxxxxxxxxxxxxx>]

I agree with Chris, but I'm surprised that, as yet, no one has looked at
the reason for sub-netting.  Just 'because it exists' is a bad reason.

A good reason is where discernible groups need access to peculiar
resources.  These could be:

a) A particular server/servers (could be special mail/file-print/proxy
servers for the group of machines on the sub-net).

b) Specific network printers.

c) Other special shared network resources (web-cam; PLC control
technologies(!!); robots; turtles etc etc).

By sub-netting and locating the identified resources on the appropriate
sub-net, then access is made very easy for those who share that sub-net,
but not necessarily denied to less frequent users who may live on another
one.  In this way, each sub-net can concern itself with the resources
which are *predominantly* for its users, and in a way which is
commensurate with this, the network traffic is *generally* limited to
those switches / routers (depending upon the methodology used on your
physical network) that deal with the identified sub-net.

By planning network resources around places of need, essential sub-net
divisions should really present themselves.  It is these that then become
'categorically' good things.

Hope this helps further.

Andrew

> The use of subnets is categorically a good thing; this prevents
> broadcast traffic from slowing the network down and is a useful way of
> providing QoS - the downside is lag between subnets if you use a router
> rather than layer 3 switching. You also need to provide services to
> resolve netbios names e.g. WINS, and have a method of providing DHCP
> support.
>
> We use layer 3 to support 20+ class C and below subnets without any
> issues (W95/8,NT, 2000, XP, Linux, Unix). What concerns do you have on
> his behalf?
>
> Chris
>
> -----Original Message-----
> From: Grainge,  Derek
> To: suse-linux-uk-schools@xxxxxxxx
> Sent: 9/15/03 9:47 AM
> Subject: [suse-linux-uk-schools] address ranges
>
> A colleague (a real colleague not me pretending!) has a network which
> has grown like topsy. It consists of 8 class C addresses covering
> 192.168.0.0 - 192.168.7.255   He's operating a mixture of platforms
> including the odd linux server but a number of W2000 ones.
>
> I think he should take the time and trouble to use a single class B
> range instead.   Can any network guru tell me - is it a) necessary or b)
> desirable?
>
> Thanks in advance,  Derek
>
>
>
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-- 
Email: aray@xxxxxxxxxxxxxxxxxx


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