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How do I find which processes are using a given network interface at any given moment? I am using Fedora and Ubuntu.

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up vote 1 down vote accepted
netstat -ap -i <interface>

This should show you the information you're looking for. If you put watch in front of it, you'll see updates.

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Or netstat -anp -i <interface> – Diblo Dk Jul 2 '13 at 22:37

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