2 networks on same cable modem with a firewall

September 14, 2012 at 14:23:55
Specs: Windows 7
how do i create 2 networks using 1 cable modem and 1 router and i would like to add a firewall
thinking of using xywall usg20 for the firewall..... the issue is i have a small business with 1 point of sale and1 back office computer.(network1) and i would also like to use an air port wifi to offer wifi to my cleints on a seperate network(network2) not allowing access to network1 and i want a firewall on network 1 to protect the back office and pos system

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September 14, 2012 at 14:33:43
Is your cable modem a combination unit? (ie: combo modem/router/wireless access point) If it is, then you can do this with the equipment you have now. Otherwise, you would need to buy a second router in order to create a second, separate, network.

If you can afford a second router, I would buy one and then you would setup your "public" wifi network on the router connected directly to the internet, and your private network would hang off of the second router you'd connect to that first router.

For more info on how it's done simply click on my name above in this response and read my “how-to” guide titled, “Add a second Router to your LAN

You would want to use "version 2" from my guide wherein you interconnect the two switches LAN port to WAN port

It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.

***William Henley***

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September 14, 2012 at 14:44:12
My suggestion would be to use a Linux box with 3 Ethernet ports to be used as the one and only router that you need.

The WAN (i.e., your cable modem) connects to eth0, the POS network would be eth1, and the wireless network (using an AP instead of a router) would be on eth2. You would use iptables on the server for the firewall between the networks and if you wish you could add a secondary firewall, but if iptables is setup correctly that wouldn't really be needed.

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September 14, 2012 at 14:54:15
i currently have a cradlepoint router but was thinking of buying a cisco router i would like to only use 1 router to clean up the mess that is currently there,,,, there configuration is like this 1 smc modem from time warner. then 1 router 3 wired connections pos1 and back office and an air port wifi access point

i would like to add the usg20 xyzall firewall and seperate the pos1 and back office from the wifi clients so that they are on a seperate addresses and cannot communicate with the pos or backoffice computer and i would like the firewall on pos and back office computer only

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September 14, 2012 at 15:07:13
You want a router with a guest wifi network. My netgear wndr3600 does this.

Keep it simple.

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