CORRECT TEXT
Please open the ip_forward, and take effect permanently.
Answer: see explanation below.
Explanation
vim /etc/sysctl.conf net.ipv4.ip_forward = 1
sysctl Cw (takes effect immediately)
If no “sysctl.conf” option, use these commands:
sysctl Ca |grep net.ipv4
sysctl CP net.ipv4.ip_forward = 1
sysctl -w