Configure wireless router with different set of IPs than the wired network

In a network environment, is it possible to configure a wireless router which uses a different network structure address than the rest of the wired network?
The reason for this request is that several IP addresses are being used, therefore another set of different IP address is required for wireless internet access.
Devices connected to the wireless do not need to be connected to the network which is on the hardwired network.  The wireless router is simply for internet access.
The current internet from the modem is going directly into an existing VPN, and so there is not an option to connect the internet from then modem directly into the wireless router.
Is there a way to perhaps use an ethernet connection from the existing wired network into a wireless router, and then transmit a different set of possible IP addresses for wireless internet access only?   For instance if the wired network starts with 191.... but the wireless network starts with 10.... is this possible?
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Rob WilliamsCommented:
Hi end business class routers can do this or even small business/home units that support a guest network.  Alternatively you could look at an article I wrote a few years ago about creating isolated networks with inexpensive gear.
FOXActive Directory/Exchange EngineerCommented:
This can be done in the management of the router gui.  Assign a different dhcp scope with the addresses you desire.
You will need a router where you can designate VLANs and hence you will be able to assign different DHCP range to each VLAN.  I haven't seend this feature in a home router but if DDWRT or Tomato firmware support your router then you may be able to achieve this.
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Rob WilliamsCommented:
As Wayne said you need to be able to create a VLAN.  Several of the home routers with a "Guest Network" do this automatically now.  You can't customize, but it basically creates a VLAN in a different subnet with Internet access only.
Sandeep GuptaConsultantCommented:
only point is that wireless IP network you want to use should be routable toward wired network.
Sandeep GuptaConsultantCommented:
Closing & distributing point on everyone's contribution.
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