split/isolate network

[NoOp]

On 11/21/2010 11:49 AM, rikona wrote:
> Hello NoOp,
> 
> Saturday, November 20, 2010, 8:34:15 PM, NoOp wrote:
...
> N> I'm a little confused on exactly what/why you are trying to accomplish.
> 
> I'm trying to do essentially what you describe below.
> 
> N> Both subnets will need to share a common gateway with only one
> N> internet connection. So why not just add another router to
> N> 'router/firewall' and have it issue DHCP on a separate subnet?
> 
> cable modem ->> router/firewall1 -> subnet1 (fixed IP wired)
> N>                      |
> N>                router/firewall2 -> subnet2 (DHCP wireless)
> 
> N> If the routers are configured properly, subnet2 will never see
> N> subnet1 unless you allow it in the routers firewall rules. This is
> N> how I separate my 'guest' wireless from my wired machines. Wired is
> N> on a highly configurable Cisco router, Wireless is on standard
> N> Netgear wireless router/firewall2 -> subnet2.
> 
> This is what I used to do when I had multiple fixed IP addresses. Each
> router had its own fixed IP address, and behaved just as you
> described. . My current [and only broadband monopoly - Comcast] ISP
> has dynamic IPs and ONLY ONE AT A TIME. If I want what I had before I
> would have to get a 'business class' account for a LOT more money.
> 
> So, what I want to do is have isolation using only one IP address.

You only get one dynamic IP from Comcast modem.
Specifically, what router are you using?