Add a sub-interface IP address in Linux and Ping the specified source IP address.

Article Title: add a subinterface IP address in Linux and Ping the specified source IP address. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source.

The cause is that ping packet loss often occurs from a Linux server to a network device in the near future.

But not on other machines. To confirm that the source IP address of the server is restricted on the network device, configure the sub-interface IP address of the same network segment on the server for testing, use the ping command to specify the IP address of the sub-interface (the method is the same as that of the extended PING on the network device ). No packet loss was found after testing, which indicates that the original IP address may be limited. The configuration is as follows:

** Add a subinterface IP address

# Ifconfig eth2: 1 192.168.4.23 netmask 255.255.255.0 up

** Remove the subinterface IP address

# Ifconfig eth2: 1 192.168.4.23 netmask 255.255.255.0 down

** Specify the source IP address ping

# Ping-I 192.168.4.23-c 192.168.12.100