First of all, thanks for your quick reply. The plugin still not working for me.
I've set the default network (in site administration > plugins > plugin overview > attendance > settings ) as "10" to allow all IP's in a network starting with "10", created a new attendance activity and created a new session with "require network address" as "use default", but I still can check my attendance using 3G. Set network address in individual session levels isn't working too. I can use 3G either.
Am I setting default network wrong? The network must be "10" because the second part of IP already changes (10.45, 10.120, etc.).
To be more specific, and help you to understand what I'm trying to do either, my University uses EDUROAM network to all students, and we are trying to use the attendance plugin to work only on this network.
If you need more informations, please let me know.
Thank you very much for your help.