On Ubuntu, how do I get a list of network connections my computer has made in the last few days? Is there a easy way to do this?
You can't get ended connections unless you were logging them. To get the current connections:
This will show the current opened source and destination ports with IPs.
To get more details about the contents of the connections, install tcpdump if it's not installed and run:
And you can run that in the background and write the output to a file.