Is there any func to dissconnect from network?

[Hell4Ge]

I mean the LAN Connection, it can be also done by turn off/on Ethernet driver in Device Manager

Maybe some CMD command?

Edited October 4, 2012 by Hell4Ge

[Juvigy]

Here is the cmd command:

Ipconfig /release

[FireFox]

@Juvigy

In some cases, this function does not work because Windows auto reconnect to the network after few seconds.

@Hell4Ge

If it works for you then it's good, if it's not the case, you can disable (disconnect) the connections, search for the keywords NIC or disable network.

Br, FireFox.