Re: two networks sharing one router
On Thu, 9 Oct 2003 17:25:46 +0300 "M. Civan CAMKIRAN" <email@example.com>
> 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:
You'd be probably better/cheaper off with a multiport (!) DSL-enabled