how can we refresh the internet connection?

[IT Expert]

ipconfig /release
ipconfig /renew

This releases, and then renews if possible, your IP address for your Internet adapter.

Better yet, put both these commands in a batch file to quickly refresh your Internet connection. I do this on my systems with a batch file I created called 'ip.bat.' And, for added convenience, consider creating a shortcut to this batch file on your Desktop or QuickLaunch bar for one or two-click IP address release and renewal. You may want to add a "pause" command to ensure the Internet connection property refreshed its address before the batch file's DOS window closes.

Here's an example ip.bat:

@ipconfig /release
@ipconfig /renew
@pause