Get a list of network connections my machine is making

Question

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?

for future cases, you can set up your system as described in [there](http://www.cyberciti.biz/faq/linux-tcpip-connection-monitor-howto/). — sazary, Jan 30 '13 at 20:59

score 35 · Accepted Answer · answered Jan 30 '13 at 21:02

35

You can't get ended connections unless you were logging them. To get the current connections:

# sudo netstat -tupn

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:

# sudo tcpdump -X -i eth0

And you can run that in the background and write the output to a file.

answered Jan 30 '13 at 21:02

Islam

Thanks @islam. Is there is a good way to automatically convert the ip address in netstat to their corresponding dns entries? – Saqib Ali Jan 30 '13 at 22:31
1

In the netstat remove the argument 'n' which means don't resolve IPs to hostnames. – Islam Jan 31 '13 at 08:00
I would recommend adding the -a (all) flag as well. – cupojavashort Jan 31 '13 at 10:58
1

sudo netstat -tupnc <-- added c for continuous if you need to watch it for live connections. – rjkunde Apr 29 '20 at 01:09

score 1 · Answer 2 · answered Jul 07 '15 at 17:57

1

If you are loooking for a list of ports you can use:

netstat -tupn | grep -E ":(22|80|8000) .*"

or

netstat -tupn | grep -E ":(22|80|8000) .*ESTABLISHED"

answered Jul 07 '15 at 17:57

Gonzalo

2 Answers2