-r, --route              显示路由表

        -i, --interfaces         显示接口信息表-s, --statistics         显示网络协议汇总信息

        -n, --numeric            不解析域名-p, --programs           为端口显示pid或者软件名称
        -o, --timers             显示计时器

        -c, --continuous         连续显示

        -l, --listening          显示正在监听的服务端口

        -a, --all                显示所有端口(默认只显示: connected 的端口)

#查看路由器表
[root@localhost ~]# netstat -rn

Kernel IP routing table

Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface

0.0.0.0         10.10.0.1       0.0.0.0         UG                    ens192

10.10.0.0       0.0.0.0         255.255.0.0     U                     ens192

172.31.0.0      0.0.0.0         255.255.0.0     U                     docker0

#查看正在监听的tcp端口，并显示对应的监听程序
[root@localhost ~]# netstat -ntpl

Active Internet connections (only servers)

Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name

tcp               0.0.0.0:              0.0.0.0:*               LISTEN      /nginx: master

tcp               0.0.0.0:              0.0.0.0:*               LISTEN      /sshd

tcp               127.0.0.1:            0.0.0.0:*               LISTEN      /master

tcp6              :::                   :::*                    LISTEN      /sshd

tcp6              :::                  :::*                    LISTEN      /master         

#查看正在监听的udp端口，并显示对应的监听程序
[root@localhost ~]# netstat -nupl

Active Internet connections (only servers)

Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name

udp               127.0.0.1:           0.0.0.0:*                           /chronyd

udp6              :::                 :::*                                /chronyd        

#显示所有tcp连接及监听端口
[root@localhost ~]# netstat -ant

Active Internet connections (servers and established)

Proto Recv-Q Send-Q Local Address           Foreign Address         State

tcp               0.0.0.0:              0.0.0.0:*               LISTEN

tcp               0.0.0.0:              0.0.0.0:*               LISTEN

tcp               127.0.0.1:            0.0.0.0:*               LISTEN

tcp              10.10.0.110:          172.17.1.128:      ESTABLISHED

tcp               10.10.0.110:          172.17.1.128:      ESTABLISHED

tcp6              :::                   :::*                    LISTEN

tcp6              :::                  :::*                    LISTEN     

#显示所有udp连接及监听端口及连接的程序
[root@localhost ~]# netstat -anup

Active Internet connections (servers and established)

Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name

udp               10.10.0.110:       114.114.114.114:      ESTABLISHED /nginx: worker

udp               127.0.0.1:           0.0.0.0:*                           /chronyd

udp6              :::                 :::*                                /chronyd