[direwolf-pgh]

You can set from 1 to 4 keys.

When you are setting more than one WEP key, the WEP key for transmission (defult) must be assigned to the same WEP key number for all devices that are to recieve the message. The header of the message contains the key number to be used for translating the message.

The 802.11 standard allows for key roll-over where the access point and stations agree on a method of transitioning to a new key and rotating between the 4 keys. This is usually not implemented.

bottom line... your router is set to use the first key first.