I have a wireless homenetwork, which uses a D-Link DI-624 router. I
would like to prevent outsiders from accessing my home network. How do
I go about doing this?

Your router should've came with instructions.  If not, look up this
link.  You might want to browse through D-Link website in general. 
Looks like there are 3 versions of your router, so make sure you pick
the right one.

http://support.dlink.com/faq/view.asp?prod_id=1055&question=DI-614+%20/%20DI-624%20/%20DI-614+_revB%20/%20DI-624_revC%20/%20DI-774%20/%20DI-774_revB%20/%20DI-514%20/%20DI-514_revC%20/%20DI-784

Hi,

I'm not sure if this is still an issue for you but generally you will
need to do any of the following and quite possibly use them in
combinations:

1) Disable the Broadcasting of the SSID also known as the Wireless Network Name.
2) Enable MAC Address Security
3) Use WPA or WEP for encrypting the data

All of these are disscussed in the book 'Wireless Networks Exposed'
which can be downloaded from:

http://www.wirelessxposed.com

The book tells you everything that you need to know about Wireless
Networks from security to IP Addressing on your Wireless Network, plus
much more..

Thank you in advanced

Dean Bantleman

I've also written an article on wireless security that may add a few
things, and explain in further detail the earlier comments:

http://www.andybrain.com/archive/wireless_network_security.htm