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I'd like to be monitoring ports in "realtime" and the processes that use them. Is there any tool that can handle that? I imagine somethinkg like top, but with a column that lists all ports the process is using... or a list of ports, protocol, and the process that has that port open or is listenting to.

This is for Linux based OS.

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2 Answers 2

up vote 2 down vote accepted

Was just going to ask which OS and noticed that you edited to add that. You're in luck then. Try this quick and dirty one-liner (as root) in a BASH shell:

while true ; do output=$(netstat -anptu) ; clear ; echo "$output" ; sleep 2 ; done

edit: More concise, ordered output:

while true ; do output=$( (netstat -anpt | awk '{ print $1" "$4" "$7" "$6 }' | tail -n +3 ; netstat -anpu | awk '{ print $1" "$4" "$6 }' | tail -n +3 ) | egrep '[0-9]\/' | sort | uniq) ; clear ; date ; echo "$output" ; sleep 2 ; done
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This is great! I prefer this approach as I can customize it to whatever needs I have, thank you! –  Luis Lobo Borobia May 30 at 0:05

You did not specify an OS. But if it is Linux (which I guess is likely, since you mention top), then there exist a tool called iftop, which can display the current bandwidth usage by IP address. This is not exactly what you asked for, but depending on your needs, might be close enough.

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Thanks, yes, it's for Linux, I've just edited the question to make it clear. I've seen that you can enable source and destination ports pressing capital S, and D. Thanks! –  Luis Lobo Borobia May 29 at 22:47
    
Is there a way to show the process too? –  Luis Lobo Borobia May 29 at 22:52
1  
@LuisLoboBorobia You could try watch 'netstat -ntlp' or variants of that. –  kasperd May 29 at 23:07
    
Thanks, that one is useful too. I prefer Joshua's answer though, as I can customize it. Thanks anyway! your answers were great too. –  Luis Lobo Borobia May 30 at 0:06

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