When I have no browser opened and no updates, or any other files under downloading, System Monitor still shows non-zero Receiving rate as shown below. Why?
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Naghi
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Network activity comes from a variety of processes, and not just your web browser. On my machine right now I see activity from an email client, file sync, music streaming, and more. System updates, clock synchronisation, error reporting, and other background processes also use data.
To track which application is sending or receiving network traffic, try the nethogs package.
To install:
sudo apt install nethogs
To use:
sudo nethogs
To exit nethogs press q.
Tom Brossman
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Should I concern about such rows in output,
? root unknown TCP, wherePIDis?? – Naghi Apr 29 '20 at 12:46 -
1@Alish No, I have the same row when I run it. See this related question for more info. – Tom Brossman Apr 29 '20 at 16:10
tcpdumpand run it for a while; figure out what standard port numbers are used for. Most outgoing traffic will be ARP packets going out to the LAN. – Jos Apr 29 '20 at 09:11