Raspberry Pi auto DDNS forwarding

<b style="font-size: 15pt; line-height: 1.5;">Raspberry Pi auto DDNS forwarding</b><p align="center" class="western" lang="en-US" style="margin-bottom: 0cm">&nbsp;</p><p align="justify" class="western" lang="en-US" style="margin-bottom: 0cm">&nbsp;</p>