Pass the -B option to display bandwidth rates in bytes/sec rather than bits/sec: Pass the -b option to turn off display bar graphs of traffic: # iftop -F 192.168.1.0/255.255.255.0 -i eth0 icmp bandwidth statsįind out more about icmp ping requests and bandwidth usage per interface by host. This is useful to find out if why the network is slow:
In this example, find out packets flowing in and out of the 192.168.1.0/24 network. Use the -F option to set net/mask for traffic analysis. # iftop -N -i eth0 Find out packets flowing in and out of 192.168.1.0/24 network Pass the -N option to hide resolve port number to service names: # iftop -n -i eth0 Hide service name and port numbers Pass the -n option to disable dns lookup: Animated gif 01: iftop in action on CentOS/RHEL Don’t do DNS hostname lookupsīy default, iftop will look up the hostnames associated with addresses it finds in packets.
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