| 1 | iftop
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| 2 | ===
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| 3 |
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| 4 | 一款实时流量监控工具
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| 5 |
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| 6 | ## 补充说明
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| 7 |
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| 8 | **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。
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| 9 |
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| 10 | ### 语法
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| 11 |
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| 12 | ```shell
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| 13 | iftop(选项)
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| 14 | ```
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| 15 |
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| 16 | ### 选项
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| 17 |
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| 18 | ```shell
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| 19 | iftop: display bandwidth usage on an interface by host
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| 20 |
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| 21 | Synopsis: iftop -h | [-npblNBP] [-i interface] [-f filter code]
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| 22 | [-F net/mask] [-G net6/mask6]
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| 23 |
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| 24 | -h display this message
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| 25 | -n don't do hostname lookups
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| 26 | -N don't convert port numbers to services
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| 27 | -p run in promiscuous mode (show traffic between other
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| 28 | hosts on the same network segment)
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| 29 | -b don't display a bar graph of traffic
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| 30 | -B Display bandwidth in bytes
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| 31 | -i interface listen on named interface
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| 32 | -f filter code use filter code to select packets to count
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| 33 | (default: none, but only IP packets are counted)
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| 34 | -F net/mask show traffic flows in/out of IPv4 network
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| 35 | -G net6/mask6 show traffic flows in/out of IPv6 network
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| 36 | -l display and count link-local IPv6 traffic (default: off)
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| 37 | -P show ports as well as hosts
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| 38 | -m limit sets the upper limit for the bandwidth scale
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| 39 | -c config file specifies an alternative configuration file
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| 40 | -t use text interface without ncurses
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| 41 |
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| 42 | Sorting orders:
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| 43 | -o 2s Sort by first column (2s traffic average)
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| 44 | -o 10s Sort by second column (10s traffic average) [default]
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| 45 | -o 40s Sort by third column (40s traffic average)
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| 46 | -o source Sort by source address
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| 47 | -o destination Sort by destination address
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| 48 |
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| 49 | The following options are only available in combination with -t
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| 50 | -s num print one single text output afer num seconds, then quit
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| 51 | -L num number of lines to print
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| 52 | ```
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| 53 |
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| 54 | ### 界面说明
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| 55 |
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| 56 | > 第一行为带宽，这里为1Mbit,不是字节哦.
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| 57 | > 连接列表，最后三列分别是2秒，10秒和40秒的平均流量
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| 58 | > `=>` 代表发送
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| 59 | > `<=` 代表接收
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| 60 | > 最后三行表示发送，接收和全部的流量，
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| 61 | > 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。
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| 62 |
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| 63 | ### 实例
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| 64 |
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| 65 | ```shell
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| 66 | iftop # 默认是监控第一块网卡的流量
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| 67 | iftop -i eth1 # 监控eth1
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| 68 | iftop -n # 直接显示IP, 不进行DNS反解析
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| 69 | iftop -N # 直接显示连接埠编号, 不显示服务名称
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| 70 | 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
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| 71 | ```
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| 72 |
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| 73 |
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| 74 |
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