There is no "native" log for Internet Access. There is plenty of 3rd party software which runs at the gateway to filter or log just about everything. A quick google on "Content Filter" or "Web Filter" will give you a ton of info.
If you're asking for technical help, please be sure to include all your system info, including operating system, model number, and any other specifics related to the problem. Also please exercise your best judgment when posting in the forums--revealing personal information such as your e-mail address, telephone number, and address is not recommended.
Internet log for network systems
I would like to get knowldge about how many clients are using the internet within LAN.
Best Regards
M.A.