using a switch rather than router

using a switch rather than router
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using a switch rather than router BigJim 01-19-2006
Posted by Warren on January 21, 2006, 1:59 am
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Henry wrote:
>> But I have always understood that the computer with the two NICs is
>> unprotected.
>
> Not so! See
>
> http://www.sustworks.com/site/prod_ipnrx_overview.html
>
> for how it can be done with firewall protection!

The very idea that software running at the application level can protect the
same box it's running on is hogwash. In order to get to the application
level, you've left the OS exposed.

It's like locking an interior door in a house to protect the contents of the
whole house. Rooms in that house are still exposed before getting to the
interior door. To protect those rooms, you must prevent someone from even
being able to enter the house.

What some software company will say about their product in order to sell it
is not convincing. The underlying theory is flawed.

And it makes little sense to even risk it when the cost of this flawed
method is greater than a more secure, and simpler method. It's just dumb to
use this as a solution when good, external NAT routers are available that
will keep intruders from even getting to the box in question in the first
place.

--
Warren H.

==========
Disclaimer: My views reflect those of myself, and not my
employer, my friends, nor (as she often tells me) my wife.
Any resemblance to the views of anybody living or dead is
coincidental. No animals were hurt in the writing of this
response -- unless you count my dog who desperately wants
to go outside now.

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Pure Networks
Posted by Bit Twister on January 20, 2006, 9:13 am
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On Fri, 20 Jan 2006 08:45:44 +0200, Henry wrote:
>
>> > I have used a router with my computers from day one. Will a switch allow me
>> > to use more than one computer at a time with a broadband cable modem. I
>> > understand about the NAT firewall with router.
>>
>> Sure. But put the switch after the router.
>
> Bzzzt. Doesn't 'rather than' mean _instead of_???

Bzzzt. Only if the OP wants to buy more ip addresses from ISP.

Example:

4 computers connected to router connected to cable modem, user
pays for one ip address because of Network Address Translation (NAT).

4 computers connected to switch connected to cable modem, user
pays for 4 ip addresses because switch is not NATing computers.


Posted by Henry on January 20, 2006, 2:29 pm
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> 4 computers connected to switch connected to cable modem, user
> pays for 4 ip addresses because switch is not NATing computers.

Not at all. The software that is doing the IP 'routing' takes care of
the NAT too. Works a treat, too. See, for example

http://www.sustworks.com/site/prod_ipnrx_overview.html

cheers,

Henry

Posted by DLR on January 20, 2006, 2:36 pm
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>>4 computers connected to switch connected to cable modem, user
>>pays for 4 ip addresses because switch is not NATing computers.
>
>
> Not at all. The software that is doing the IP 'routing' takes care of
> the NAT too. Works a treat, too. See, for example
>
> http://www.sustworks.com/site/prod_ipnrx_overview.html
>

Using a switch to tie together a broad band modem and 4 computers with
one computers doing network NAT is a bad idea. Yes it can work but it's
bad in so many ways it's hard to know where to start. And Yes I even did
it a few time back when we were all new to broad band and there weren't
nasty folks scanning the entire netspace looking for ways to break into
computers. But it wasn't a great idea then, and certainly isn't now.

Posted by Henry on January 20, 2006, 2:48 pm
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[and why did DLR snip out all the attributions, by the way? Bad form,
mate.]

> >>4 computers connected to switch connected to cable modem, user
> >>pays for 4 ip addresses because switch is not NATing computers.
> >
> >
> > Not at all. The software that is doing the IP 'routing' takes care of
> > the NAT too. Works a treat, too. See, for example
> >
> > http://www.sustworks.com/site/prod_ipnrx_overview.html
> >
>
> Using a switch to tie together a broad band modem and 4 computers with
> one computers doing network NAT is a bad idea. Yes it can work but it's
> bad in so many ways it's hard to know where to start. And Yes I even did
> it a few time back when we were all new to broad band and there weren't
> nasty folks scanning the entire netspace looking for ways to break into
> computers. But it wasn't a great idea then, and certainly isn't now.

Everyone keeps bringing extraneous baggage to this discussion. The OP
asked

> Will a switch allow me
> to use more than one computer at a time with a broadband cable modem.

and the simple answer is 'YES'.

cheers,

Henry

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