establishing connection from a command line

Replace Local Area Connection if it is named differently

netsh interface set interface "Local Area Connection" disabled

netsh interface set interface "Local Area Connection" enabled

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ipconfig/release will disconnect
ipconfig /renew will reconnect

Are you wanting to disable the network connection? Or just communication to the internet? (But still communicate over the network?) the following must be run from an elevated command prompt. (Run As Administrator)

wmic path win32_networkadapter where NetConnectionID="Wireless Network Connection" call disable
wmic path win32_networkadapter where NetConnectionID="Wireless Network Connection" call enable

Change the NetConnectionID to match the interface you want to disable/enable.

Hope this helps!

:o)

Bartender_1

In fact I want to reconnect a usb modem (dial-up connection to the internet). I can do it form an external app or control panel. But I want to do it from a command line.

Well the solution is above.

Very close but I everytime I execute rasphone -d <destination name> another window pops up and I have to press enter. I want to skip it.

Rasdial does the trick. But because your comment helped me find the solution I accept it.