How do I find out which programs connect to the internet at startup?

Question

My installed OS is Ubuntu 12.10, 64 bit, English, kernel version 3.5.0.21

Which commands must I issue at the terminal window to find out the names of programs that connect to the internet immediately after Ubuntu boots up?

Answer 1

sudo netstat --inet -p will show current active or listening connections with names of programs.

Upd

To view connections with LISTENING state netstat must be invoked with additional -a option: sudo netstat --inet -pa

Answer 2

NetHogs is a handy little tool which shows you what processes are utilizing your bandwidth. You can startup this application immediately after reboot and you would know which programs are connecting to the internet at startup.

Step 1 : Install NetHogs with the following command:

sudo apt-get install nethogs

Step 2 : Once installed, you may run nethogs with the following command:

sudo nethogs <interface>

replace <interface> with eth0, wlan0, ppp0 depending on what you use to connect to the internet. If you are not sure, then run ifconfig to know what are the available options for you.

You may quit the program by pressing Ctrl + C.