Iftop measures the data flowing through individual socket connections, Iftop uses the pcap library to capture the packets moving in and out of the network adapter, and then sums up the size and count to find the total bandwidth under use.
Although iftop reports the bandwidth used by individual connections, it cannot report the process name/id involved in the particular socket connection. But being based on the pcap library, iftop is able to filter the traffic and report bandwidth usage over selected host connections as specified by the filter.
Install iftop - Ubuntu/Debian/Fedora users get it from default repos. CentOS users get it from Epel.
# fedora or centos
$ yum install iftop -y
# ubuntu or debian
$ sudo apt-get install iftop
$ sudo iftop -n
The n option prevents iftop from resolving ip addresses to hostname, which causes additional network traffic of its own.
Install iftop - Ubuntu/Debian/Fedora users get it from default repos. CentOS users get it from Epel.
# fedora or centos
$ yum install iftop -y
# ubuntu or debian
$ sudo apt-get install iftop
$ sudo iftop -n
The n option prevents iftop from resolving ip addresses to hostname, which causes additional network traffic of its own.
