Check ip forwarding is turned on
sysctl net.ipv4.ip_forward
Net.ipv4.ip_forward = 0 indicates that the display is not open.
Open
/etc/sysctl.conf vim
# add a line
net.ipv4.ip_forward = 1
# ZZ Save the file the Shift
# sysctl -p reload
sysctl
sysctl kernel parameters in the configuration of the display / proc / sys directory. Can be set or reset sysctl networking capabilities, such as IP forwarding, IP source routing debris removal and inspection. Users only need to edit the /etc/sysctl.conf file, you can manually or automatically perform functions controlled by sysctl.
Format:
sysctl [-n] [-e] -w variable=value
sysctl [-n] [-e] -p <filename> (default /etc/sysctl.conf)
sysctl [-n] [-e] -a
Meaning of commonly used parameters:
-w temporarily change the value of a specified parameter, such as
sysctl -w net.ipv4.ip_forward=1
-a display all system parameters
-p, if not specified in /etc/sysctl.conf that is loaded from the file is loaded from the specified system parameters
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