Re: two networks sharing one router
You could also replace Rou1 and Rou2 in your diagram with a single
router with multiple NICs, no?
And as long as you're doing that, you almost may as well use 3 NICs and
dump the DSL router -- making this a relatively standard firewall
setup...
-hp3
On Thu, 2003-10-09 at 10:21, Volker Tanger wrote:
> Greetings!
>
> On Thu, 9 Oct 2003 17:25:46 +0300 "M. Civan CAMKIRAN" <civan@ads.com.tr>
> wrote:
>
> > I have two networks which belong to two different companies in a
> > building and one broadband internet connection. I decided to buy an
> > inexpensive 4 port router and plug each hub to 2 of the 4 ports on
> > this router. Questions are:
>
> Please define "inexpensive 4port router":
>
> - a cheap (DSL) router with builtin 4port switch/hub, thus effectively
> only a 2port router with the second port multiplied by an internal
> hub/switch (usually in the $50+ range)
>
> - a router with 4 full/independent LAN/WAN interfaces (e.g. Cisco 26xx,
> usually above $1000)
>
>
> > 1. Is it possible to have both networks use the same internet
> > connection in this way?
>
> Yes - but usually the cheap DSL routers don't allow multiple independent
> networks on the inside interface/hub.
>
>
> > 2. Is it possible to prevent the computers see the other network's
> > computers? If yes, how?
>
> Full router: yes, just set the proper ACLs.
> DSL router with hub/switch: no
>
> Depending on your brand, cheap broadband routers MIGHT be able
> (depending on built-in options) to do just routing ethernet/ethernet. If
> so, you'd need two more routers, each one hiding the individual company
> network, then connecting to the common DSL router. ASCII art below:
>
>
> WWW
> |
> |
> DSLrouter
> | |
> | |
> Rou1 Rou2
> | |
> | |
> --+-- --+--
> LAN1 LAN2
>
>
> You'd be probably better/cheaper off with a multiport (!) DSL-enabled
> firewall...
>
> Good luck!
>
> Volker Tanger
>
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