He can still detect the home network using different tools.
Netstumbler/ministumbler will send out a packet, and look for replies, and your average access point will still respond even if it's BSSID broadcast has been disabled. A wireless sniffer as well will locate a access point just by looking for the traffic from/to it.
It is very important to do these steps to lockdown or harden your network, because it makes it harder for someone to get it. The usual people attacking networks are looking for low-hanging fruit, easy places to get in. So, Make it hard for them. |