Since I bought my Netgear DG824M Wireless ADSL Modem Gateway I've been interested in securing it sufficiently enough to prevent it getting hacked.
Out of the box the router will work with default values, however it is VERY risky to keep your wireless access point running like this.
Here are a few tips which should keep out casual hackers and bandwidth thieves.
SSID (Service Set Identifier) Broadcasting
Your Service Set Identifier is basically the name of your wireless service, wireless access points all come with a default value for this, in the case of Netgear this can either be "Netgear" or "Wireless", you should change this to something else that does not describe your business or location (Note: SSID is case-sensitive).
The default setting on most Access Points is for the SSID to be broadcast out to anyone in range of the router, this is convenient for users to join your network, but handy for hackers to easily identify your network as a potential target. You should disable SSID broadcasting.
WEP (Wired Equivalent Privacy)
This is the wireless security standard, which has been proven to be quite easy to crack, however it does provide some protection, so it is highly recommended you enable WEP preferably 128 bit encryption and change the WEP key from the default value.
MAC address access control
Each wireless (and conventional) network card has a unique MAC address. Most Access Points allow you to configure access to the network via a set of MAC addresses instead of all users, which is usually the default setting. You should use this functionality since it will make it harder for casual hackers to join your network. On Windows machines open a DOS command prompt and type ipconfig/all in order to find the MAC address of your wireless card/USB dongle, simply add the MAC addresses of all the computers you need to access the router.
You should try and locate your Access Point in such a way as to reduce the coverage outside your building. Try to position your Access Point in the middle of your building equidistant from your computers and wireless devices, but away from windows and perimeter walls since this will provide good wireless coverage for people outside your building.