Debian_IPv6(){

iName=$(ip add | grep "^2: " | awk -F'[ :]' '{print $3}')
dhclient -6 $iName #临时开启IPv6
echo $iName #人工查看网卡是否正确
cp /etc/network/interfaces /root
sed -i "$ a iface $iName inet6 dhcp" /etc/network/interfaces
echo "Reboot... & ping ipv6.google.com After reboot"
reboot
}

Ubuntu_IPv6(){

yamlName=$(find /etc/netplan/ -iname "*.yaml")
iName=$(ip add | grep "^2: " | awk -F'[ :]' '{print $3}')
dhclient -6 $iName
MAC=$(ip add | grep "link/ether.*brd" | awk -F' ' '{print $2}')
IPv6=$(ip add | grep "inet6.*global" | awk -F' ' '{print $2}')
if [[ ${#IPv6} -lt 5 ]]; then echo "Can't IPv6"; exit 1; fi

cp $yamlName /root/

cat <<0099 >$yamlName
network:
   ethernets:
      ens3:
          dhcp4: true
          dhcp6: false
          match:
              macaddress: $MAC
          addresses:
              - $IPv6
          set-name: $iName
   version: 2
0099

netplan apply
sleep 2s
ping ipv6.google.com
}

myOS=$(hostnamectl | sed -n 's_.*System: \(\S*\).*_\1_p')
#Ubuntu, Debian

if [[ "$myOS" =~ "Ubuntu" ]]; then
echo "Ubuntu"
Ubuntu_IPv6
elif [[ "$myOS" =~ "Debian" ]]; then
echo "Debian"
Debian_IPv6
fi