Tip #813 Monitor open TCP connections
The command below will monitor open TCP connections:watch -n 1 "netstat -tpanl | grep ESTABLISHED"
This will show connections by processes you can view, or if done as root ("sudo netstat") all processes.
Another option to perform the same task is:
sudo lsof -i -T -n
Again watch could be used with this, or adding -r as an option will make lsof refresh the output.
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