Separating a network for two businesses

June 20, 2009 at 07:53:32
Specs: SBS 2003, NA

Bit of a strange one and I need some advice about how best to achieve this.

What I have currently is a SBS server with a netgear unmanaged switch and netgear adsl router and 10 client workstations. This is all fine but recently the owner of the business has rented out one of their rooms to another business and allowed them to connect their computers to the existing network. This means they are getting dhcp from the server and using the internet connection.

What I want to do is separate the computers in that room from the main network but still allow them to share the internet connection.

At first I thought of just purchasing a 2nd switch and patching their computers into that only and connecting one of the network ports of the adsl router to their network also. The problem with this is they dont have a server to do dhcp or routing etc.

The other thing I thought of was replacing the existing switch with a smart switch capable of doing vlans but I dont have any experience setting up vlans so a bit unsure about that.

Anybody got any ideas of how best to achieve this?



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June 21, 2009 at 05:31:59
You could buy another SOHO router, connect it's WAN port to a LAN port on your router, and configure both the WAN and LAN sides on the router, and put them on a different subnet that's completely separate from yours.

Their SOHO router would have it's own DHCP server.

This would be both cheaper and easier than buying a managed, VLAN capable switch.

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June 21, 2009 at 07:46:09
thanks for the reply, wasnt sure if that would work without configuring the adsl details but i guess if i disable nat on the 2nd router so its just routing it should work. might have to get one with more than 4 ports or a 2nd unmanaged switch to allow more computers to connect.

thanks again

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June 21, 2009 at 10:22:13
You'll be plugging router 2 into your existing router which is already setup for the internet. So you won't need to configure router 2 for the internet.

You will however have to configure it to connect to router 1. That's why I said, WAN port on router 2 plugs in to LAN port on router 1. You will give the WAN side of router 2 an IP in the same subnet as router 1's LAN. You will use the same subnet mask and the default gateway IP on router 2's WAN port will be the LAN IP of router 1.

Once you have router 2 communicating properly with router 1, you can then configure the LAN side of router 2 for a completely separate subnet and use it's DHCP to dish out TCP/IP settings to clients plugged into it.

Leave NAT enabled, you'll still need it since you're going to be sending multiple client IP's of your new subnet, through the single IP (on the WAN side) of the router to the other subnet.

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