Linux常用命令-netstat

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命令

netstat

描述

Print network connections, routing tables, interface statistics, masquerade connections, and multicast memberships
查看网络连接状态

用法

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netstat [-vWeenNcCF] [<Af>] -r
netstat [-vWnNcaeol] [<Socket> ...]
netstat { [-vWeenNac] -I[<Iface>] | [-veenNac] -i | [-cnNe] -M | -s [-6tuw] } [delay]

选项

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Options:
  -r, --route              显示路由表
  -I, --interfaces=<Iface> display interface table for <Iface>
  -i, --interfaces         显示网卡列表
  -g, --groups             display multicast group memberships
  -s, --statistics         显示网络状态信息
  -M, --masquerade         display masqueraded connections
  -v, --verbose            be verbose
  -W, --wide               IP地址不换行显示
  -n, --numeric            显示数字格式而非服务名称
  --numeric-hosts          don't resolve host names
  --numeric-ports          don't resolve port names
  --numeric-users          don't resolve user names
  -N, --symbolic           resolve hardware names
  -e, --extend             display other/more information
  -p, --programs           显示pid
  -o, --timers             display timers
  -c, --continuous         不断的刷新显示,实时查看连接状态
  -l, --listening          display listening server sockets
  -a, --all                display all sockets (default: connected)
  -F, --fib                display Forwarding Information Base (default)
  -C, --cache              display routing cache instead of FIB
  -Z, --context            display SELinux security context for sockets
  <Socket>={-t|--tcp} {-u|--udp} {-U|--udplite} {-S|--sctp} {-w|--raw} {-x|--unix} --ax25 --ipx --netrom
  <AF>=Use '-6|-4' or '-A <af>' or '--<af>'; default: inet

注意

无

示例

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$ netstat -V
net-tools 2.10-alpha
# -r 显示路由表
$ netstat -r
Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
default         gateway         0.0.0.0         UG        0 0          0 eth0
192.168.80.0    0.0.0.0         255.255.255.0   U         0 0          0 eth0
# -i 显示网卡列表
$ netstat -i
Kernel Interface table
Iface             MTU    RX-OK RX-ERR RX-DRP RX-OVR    TX-OK TX-ERR TX-DRP TX-OVR Flg
eth0             1500     3072      0      0 0          1784      0      0      0 BMRU
lo              65536        0      0      0 0             0      0      0      0 LRU
# -s 显示网络连接状态
$ netstat -s
Ip:
    3127 total packets received
    0 forwarded
    0 incoming packets discarded
    3127 incoming packets delivered
    1806 requests sent out
    8 dropped because of missing route
Icmp:
    0 ICMP messages received
    0 input ICMP message failed.
    ICMP input histogram:
    0 ICMP messages sent
    0 ICMP messages failed
    ICMP output histogram:
Tcp:
    0 active connections openings
    1 passive connection openings
    0 failed connection attempts
    0 connection resets received
    1 connections established
    3055 segments received
    1732 segments send out
    0 segments retransmited
    0 bad segments received.
    0 resets sent
Udp:
    59 packets received
    0 packets to unknown port received.
    0 packet receive errors
    74 packets sent
    0 receive buffer errors
    0 send buffer errors
# 显示tcp和udp的连接
$ netstat -tu
Active Internet connections (w/o servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State
tcp        0      0 centos7:ssh             192.168.80.81:42886     ESTABLISHED
# 数字格式显示服务
$ netstat -tun
Active Internet connections (w/o servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State
tcp        0      0 192.168.80.10:22        192.168.80.81:42886     ESTABLISHED
# 显示监听地址LISTEN
$ netstat -tunl
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN
udp        0      0 127.0.0.1:323           0.0.0.0:*
udp6       0      0 ::1:323                 :::*
# 显示所有连接
$ netstat -tuna
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address           Foreign Address         State
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN
tcp        0      0 192.168.80.10:22        192.168.80.81:42886     ESTABLISHED
udp        0      0 127.0.0.1:323           0.0.0.0:*
udp6       0      0 ::1:323                 :::*
# 实时刷新显示,可以指定时间间隔,单位秒
$ netstat -tunac
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address           Foreign Address         State
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN
tcp        0      0 192.168.80.10:22        192.168.80.81:42886     ESTABLISHED
udp        0      0 127.0.0.1:323           0.0.0.0:*
udp6       0      0 ::1:323                 :::*
# 每5秒刷新一次
$ netstat -tunac 5
...
# 显示IPv4连接
$ netstat -tuna4
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address           Foreign Address         State
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN
tcp        0      0 192.168.80.10:22        192.168.80.81:42886     ESTABLISHED
udp        0      0 127.0.0.1:323           0.0.0.0:*
# 显示IPv6连接
$ netstat -tuna6
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address           Foreign Address         State
udp6       0      0 ::1:323                 :::*