When you set up your network did you secure it by requiring a password in order to connect to it? If you did, does he have the password so he can connect to it at any time?
What do you mean by "default gateway number"?
Was it this number 192.168.100.1
(clickable link to the page) which is the address for your modem configuration page.
If not, try that number.
User Name admin
If there was no password set up you can create one.
If there was and he knows it you can change it.I also suggest you change the default password from motorola to something else. Please note that this password is not the same as the one for connecting to a network. Do not use the same one for both of them.
To check your settings follow the directions here which will walk you step by step through the process. http://moto.force.com/consumers/articles/General_FAQs/SBG6580-Changing-the-Wi-Fi-Security-Key/?l=en_US&c=Consumer_Products%3ASBG6580&fs=RelatedArticle
Create a security key AND router configuration page password that YOU will remember but he won't be able to guess. If there are other people in your house who need the password stress that they are not to give it out to anyone.
If you want you can change the network name. Directions can be found by clicking the Changing the Wireless Network Name (SSID) link on this page http://moto.force.com/consumers/articles/User_Guide/SBG6580-User-Guide/?l=en_US&c=Consumer_Products%3ASBG6580&fs=Search&pn=1
IF YOU CHANGE THE PASSWORD, ALSO KNOWN AS THE SECURITY KEY, you will have to enter it when you want to connect to your network IF you use a wireless connection for your computer. If you used a wired connection to the modem/router you probably will not have to do this.
If your neighbor does not know the password he won't be able to connect to your network.
Edited by Queen-Evie, 21 October 2013 - 04:37 PM.