How can I disable internet access on Windows 7 via the command line?

Try netsh:

netsh interface set interface "Local Area Connection " ENABLE
netsh interface set interface "Local Area Connection " DISABLE

You can also, disable the internet connection just by releasing the assigned IP address.

From the elevated command prompt (Run as administrator), type:

ipconfig/release

When you want to enable the internet connection then:

ipconfig/renew

Hope this helps

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