netstat

来自net-tools包，建议可以使用ss代替

常用选项

-t: tcp协议相关
-u: udp协议相关
-w: raw socket相关
-l: 处于监听状态
-a: 所有状态
-n: 以数字显示IP和端口
-e：扩展格式
-p: 显示相关进程及PID

 

常用组合

-tan, -uan, -tnl, -unl -nltup

显示路由表，netstat -i 打印网络接口信息

netstat {--route|-r} [--numeric|-n]
-r: 显示内核路由表
-n: 数字格式

显示接口统计数据

netstat {--interfaces|-I|-i} [iface] [--all|-a] [--extend|-e] [--program|-p] [-
-numeric|-n]
netstat -i
netstat –I=IFACE
ifconfig -s IFACE

例子

[root@centos8 ~]#netstat -I
Kernel Interface table
Iface             MTU    RX-OK RX-ERR RX-DRP RX-OVR    TX-OK TX-ERR TX-DRP TX-OVR Flg
ens33            1500     1496      0      0 0           350      0      0      0 BMRU
ens37            1500      120      0      0 0           301      0      0      0 BMRU
lo              65536        0      0      0 0             0      0      0      0 LRU
[root@centos8 ~]#
[root@centos8 ~]#ifconfig -s ens33
Iface      MTU    RX-OK RX-ERR RX-DRP RX-OVR    TX-OK TX-ERR TX-DRP TX-OVR Flg
ens33            1500     1843      0      0 0           461      0      0      0 BMRU
[root@centos8 ~]#netstat -nt
Active Internet connections (w/o servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State      
tcp        0     36 192.168.31.129:22       192.168.31.1:2268       ESTABLISHED
tcp        0      0 192.168.31.129:22       192.168.31.1:2269       ESTABLISHED
[root@centos8 ~]#

 

Iface：网络接口名称

MTU：最大传输单元

RX-OK：接收时，正确的数据包数

RX-ERR：接收时，产生错误的数据包数

RX-DRP：接收时，丢弃的数据包数

RX-OVR：接收时，由于过速而丢失的数据包数

TX-OK：发送时，正确的数据包数

TX-ERR：发送时，产生错误的数据包数

TX-DRP：发送时，丢弃的数据包数

TX-OVR：发送时，由于过速而丢失的数据包数

Flg：标志

B 已经设置了一个广播地址

L 该接口是一个回送设备

M 接收所有的数据包(混乱模式)

N 避免跟踪

O 在该接口上，禁用ARP

P 这是一个点到点连接

R 接口正在运行

U 接口处于"活动"状态

netstat -s 按照各个协议分别显示其统计数据

[root@centos8 ~]#netstat -s
Ip:
    Forwarding: 2
    793 total packets received
    16 with invalid addresses
    0 forwarded
    0 incoming packets discarded
    777 incoming packets delivered
    410 requests sent out
    139 dropped because of missing route
Icmp:
    0 ICMP messages received
    0 input ICMP message failed
    ICMP input histogram:
    1 ICMP messages sent
    0 ICMP messages failed
    ICMP output histogram:
        destination unreachable: 1
IcmpMsg:
        OutType3: 1
Tcp:
    6 active connection openings
    2 passive connection openings
    0 failed connection attempts
    0 connection resets received
    2 connections established
    533 segments received
    397 segments sent out
    0 segments retransmitted
    0 bad segments received
    0 resets sent
Udp:
    18 packets received
    1 packets to unknown port received
    0 packet receive errors
    18 packets sent
    0 receive buffer errors
    0 send buffer errors
    IgnoredMulti: 225
UdpLite:
TcpExt:
    6 TCP sockets finished time wait in fast timer
    12 delayed acks sent
    137 packet headers predicted
    77 acknowledgments not containing data payload received
    173 predicted acknowledgments
    TCPRcvCoalesce: 4
    TCPAutoCorking: 4
    TCPOrigDataSent: 297
    TCPDelivered: 302
IpExt:
    InBcastPkts: 225
    InOctets: 116885
    OutOctets: 56214
    InBcastOctets: 59527
    InNoECTPkts: 801
MPTcpExt:

 

posted on 2021-07-19 10:24  jun_li123  阅读(149)  评论(0)    收藏  举报

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