Re: multiple subnets
- From: kurt <kurtl@xxxxxxxxxx>
- Date: Thu, 05 Oct 2006 19:45:50 -0700
stueken@xxxxxxxxxxx wrote:
we are running a private class C network with a few servers and
about 60-100 hosts. By now we use several fast ethernet switches
and a few gigabit switches to connect all hosts directly.
Is it a problem, to run an other subnet in parallel on the same
switches? If both subnets use distinct netmasks and broadcast patterns,
they should not affect each other, right? Someone else tells me,
this is not possible without using VLAN capable switches.
Must all traffic between both networks be routed thru a router?
We will get a router soon, but it is fast ethernet only. So I can't
establish a gigabit connection between hosts of different subnets
any more, even if they are connected to the same gigabit switch?
Dieter.
Running 2 subnets works just fine on the same unmanaged switch, but there's really no advantage as far as traffic goes, and it's a weak security measure at best. VLANs create separate "broadcast domains" (Cisco-speak), and you would generally put different subnets on different VLANs so you could route between them. That way, traffic for local subnets stay on one VLAN and traffic between subnets passes through the router, but broadcast/multicast traffic stays in the VLAN where it originates. Regardless of whether you use VLANs or not, you'll need a router to forward traffic between subnets. Note that without VLANs, this actually INcreases traffic, rather than decreasing it as you want. You can also use a layer-3 switch somewhere in the mix, which generally handles switching, VLANs and can handle all the routing, too. But they cost WAY more. With just two small subnets I'd look at managed layer-2 switches and a decent router (Switch about $600 - $800 and router around $300 US).
....kurt
.
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- From: stueken
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