said by antdude:
Do these guest network still have password/key prompts to use it? I don't want neighbors/outside strangers to use my wifi.
I suppose it depends on the router.
The one I am using (no longer available) does. I can setup encryption, SSID, etc, just as for the regular network. Both guest and regular network are on the same WiFi channel (since they use the same chip). The guest network has a different range of private IPs (configurable), and cannot connect to the regular network, but it can see the Internet.
I think the dd-wrt alternate firmware, available for some routers, has guest network support.--
AT&T Uverse; Zyxel NBG334W router (behind the 2wire gateway); openSuSE 12.1; firefox 14.0.1