An unprotected wireless network is a danger to the privacy of the users who use it. Because of this, there are several ways to limit access to it.
One of these is to provide a filter through physical MAC addresses. Only users whose address appears in the router log will receive and IP address for internet access.
Setting up a MAC address filter is a good way to secure the network, but it seems insufficient, because in theory anyone can observe the traffic that occurs between network devices.
The other way to protect your network is to encrypt the communication network by using a WEP key, which you will get with this program. Decide the length of the key and insert it into the router. It is advisable to change the key from time to time.