- If you have VLANs in your network, then you can create a separate VLAN for your wireless segment. This will not allow broadcast traffic from the other VLANs to enter this VLAN.
- You can insert a router between your wireless network and wired network. I think this should only be done if you can't implement a VLAN based solution. Before doing this you will have to calculate the traffic on your wireless network to determine the correct router for the job. It should be a low-end router like Cisco 1600 with two Ethernet cards.
This router configuration should be very simple, and it should only point to a default route to the main router in the LAN. You can configure a static route for this subnet in your LAN main router. But before doing this, study the impact it will have on your routing. If you think that routing may be adversely affected, then think about running routing protocol on this router. Also note that you will have to assign a separate IP subnet for this part of your network in this case.
Dig Deeper on Wireless LAN (WLAN)
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