Set01. login System

Set02. Change Config
run the command:
echo ‘net.ipv6.conf.all.disable_ipv6 = 1’ >> /root/sysctl.conf
echo ‘net.ipv6.conf.default.disable_ipv6 = 1’ >> /root/sysctl.conf
echo ‘net.ipv6.conf.lo.disable_ipv6 = 1’ >> /root/sysctl.conf

Set03. Apply Config
sudo sysctl -p