linux netstat 查看端口和已建立的链接

ECS信息

• 规格：2vCPUs | 4GiB | kc1.large.2
• 镜像：openEuler 20.03 64bit with ARM | 公共镜像

linux netstat 查看端口和已建立的链接

ip a 查看网卡信息

• 地址已部分隐藏

# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
    link/ether XX:XX:XX:XX:b5:b8 brd ff:ff:ff:ff:ff:ff
    inet 192.168.0.XXX/24 brd 192.168.0.255 scope global dynamic noprefixroute eth0
       valid_lft 54605sec preferred_lft 54605sec
    inet6 XXXX::XXXX:XXXX:fe8d:XXXX/64 scope link 
       valid_lft forever preferred_lft forever

netstat -anp

• -a, --all display all sockets (default: connected)
• -n, --numeric don’t resolve names
• -p, --programs display PID/Program name for sockets

# netstat -aunp
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name    
udp        0      0 0.0.0.0:68              0.0.0.0:*                           4584/dhclient       
udp        0      0 127.0.0.1:323           0.0.0.0:*                           1086/chronyd        
udp6       0      0 ::1:323                 :::*                                1086/chronyd        
# netstat -atnp
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name    
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      1924/sshd           
tcp        0     36 192.168.0.81:22         115.171.251.96:56975    ESTABLISHED 10696/sshd: root [p 
tcp        0      0 192.168.0.81:22         115.171.251.96:56976    ESTABLISHED 10772/sshd: root [p 
tcp        0      0 192.168.0.81:40696      100.125.4.16:443        ESTABLISHED 2228/hostguard      
tcp6       0      0 :::22                   :::*                    LISTEN      1924/sshd    

arp 查看arp记录

• 地址已部分隐藏

# arp -a
_gateway (192.168.0.1) at XX:XX:3e:0d:XX:dc [ether] on eth0
? (192.168.0.254) at fa:fa:fa:fa:fa:01 [ether] on eth0

学习资料

• 弹性云服务器 ECS
• openEuler-官网
• openEuler-B站
• openEuler-慕课
• openEuler-文档
• 鲲鹏社区

欢迎各位同学一起来交流学习心得^_^