Synopsis: iftop -h | [-npblNBP] [-i interface] [-f filter code] [-F net/mask] [-G net6/mask6]

-h display this message -n don't do hostname lookups -N don't convert port numbers to services -p run in promiscuous mode (show traffic between other hosts on the same network segment) -b don't display a bar graph of traffic -B display bandwidth in bytes -a display bandwidth in packets -i interface listen on named interface -f filter code use filter code to select packets to count (default: none, but only IP packets are counted) -F net/mask show traffic flows in/out of IPv4 network -G net6/mask6 show traffic flows in/out of IPv6 network -l display and count link-local IPv6 traffic (default: off) -P show ports as well as hosts -m limit sets the upper limit for the bandwidth scale -c config file specifies an alternative configuration file -t use text interface without ncurses

Sorting orders: -o 2s Sort by first column (2s traffic average) -o 10s Sort by second column (10s traffic average) [default] -o 40s Sort by third column (40s traffic average) -o source Sort by source address -o destination Sort by destination address

The following options are only available in combination with -t -s num print one single text output afer num seconds, then quit -L num number of lines to print

iftop, version 1.0pre4copyright (c) 2002 Paul Warren and contributors