Linux iftop一款实时流量监控工具

iftop命令 是一款实时流量监控工具，监控TCP/IP连接等，缺点就是无报表功能。必须以root身份才能运行。语法：iftop(选项)选项：iftop: display bandwidth usage on an interface by hostSynopsis: 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 -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界面说明：第一行为带宽，这里为1Mbit,不是字节哦. 连接列表，最后三列分别是2秒，10秒和40秒的平均流量 => 代表发送<= 代表接收 最后三行表示发送，接收和全部的流量， 第二列为你运行iftop到目前流量，第三列为高峰值，第四列为平均值。实例：iftop # 默认是监控第一块网卡的流量iftop -i eth1 # 监控eth1iftop -n # 直接显示IP, 不进行DNS反解析iftop -N # 直接显示连接埠编号, 不显示服务名称iftop -F 192.168.1.0/24 or 192.168.1.0/255.255.255.0 # 显示某个网段进出封包流量