https://www.cnblogs.com/rockyching2009/p/11107094.html
1、netstat
socket can view the system currently in use, socket state, the process of creating the socket, connected IP address of the peer.
View the routing information can be added -r parameter, or use the route command
2、sysctl
sysctl to view, the core configuration information, of course, also includes network-related kernel parameters.
Corresponding to these parameters may likewise be read / proc / sys net / view or modify files in the directory.
3、tcpdump和Wireshark
To view network packets, or want to study protocol stack, you can use these two tools.
4, the network adapter (driver) the operating state
By / SYS / class / NET / interface directory file implementation.
5, wireless network tool
wpa_action wpa_cli wpa_passphrase wpa_supplicant iw iwconfig iwevent iwgetid iwlist iwpriv iwspy