D-Link DWL-510 Owner's Manual page 23

Check that the IP Address, subnet mask, gateway, and DNS settings
are correctly entered for the network
In Infrastructure mode, make sure the same Service Set Identifier
(SSID) is specified on the settings for the wireless clients and access
points. The SSID factory default setting for the D-Link Air products is
default. (Double-click on the WLAN icon in the taskbar. The Link
Info screen will display the SSID setting.)
In Ad-Hoc mode, both wireless clients will need to have the same
SSID. Please note that it might be necessary to set up one client to
establish a BSS (Basic Service Set) and wait briefly before setting
up other clients. This prevents several clients from trying to establish
a BSS at the same time, which can result in multiple singular BSSs
being established, rather than a single BSS with multiple clients
associated to it.
Check that the Network Connection for the wireless client is
configured properly. Select AP (Infrastructure) when connecting to
an access point and select Ad-Hoc mode when connecting without
an access point. Double-click on the WLAN icon in the taskbar >
click on Configuration to change the settings for the wireless
adapter.
If Security is enabled, make sure that the correct encryption keys are
entered on both the DWL-510 and the access point. Double-click on
the WLAN icon in the taskbar > click Encryption. Check to see that
the key selected is set to the same key as other devices on the
network.
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