[juneau-lug] Re: Networking question.

  • From: bdk <bdk@xxxxxxxxxxxxxx>
  • To: juneau-lug@xxxxxxxxxxxxx
  • Date: Sat, 16 Nov 2002 14:04:28 -0900

Thanks James.. It does help a little. I took a look at a recent electrical 
bill and am trying to figure out what I can do it cut down. Bringing down a 
box isn't an option. :) So I was thinking about combining 3 hubs into 1 and 
wanted to know if adjusting the subnets would help keep traffic to certain 
machines.

Thanks.

-sean

At 11:44 11/16/02 -0900, you wrote:

>On Sat, 16 Nov 2002 11:19:22 -0900
>"bdk" <bdk@xxxxxxxxxxxxxx> wrote:
>
> >
> >  From a security stand point, is it safe to put two devices that have
> > different ip ranges 192.168.1.x & 192.168.0.x & subnets on the same hub 
> and
> > not have them talk to each other? Or do I need a to physically separate
> > them onto two separate hubs?
> >
> > -sean
>
>Umm, depends on what you want to do in regards to security.  It all boils 
>down to host security - what can your users do to modify the network configs?
>
>If you just want the two devices to not talk to each other, then using 
>different subnets will work.
>
>However if you're at all worried about someone changing the netmask on 
>either device, then it's not a good idea.  Changing the netmask from 
>255.255.255.0 to 255.255.254.0 and suddenly the device with the new 
>netmask will see the other device.  (The other device might have trouble 
>figuring out what to do with replies if they actually tried to 
>communicate, however - presumably it's netmask is still set to 255.255.255.0.)
>
>If this is your home network & you're just worried about evil h4x0rs then 
>go ahead & keep the same wire.  If they can modify netmasks on your 
>devices you have bigger problems to worry about.  If you're at work in a 
>multiple user scenario & sensitive information on one or the other subnet, 
>it might make sense to use a different physical network if you can afford 
>another hub/switch.
>
>HTH
>
>James
>
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