Hello,
Iam just about to move a web service from remote paid cloud to my home.
I would need a service to update the ip to registrar, Gandi.net.
What is the best approach; A script at openwrt or a script at the server pc; and why;
Thank you community 
On openwrt as your router knows best when your WAN IP changes.
NO need for a manual script just install DDNS Client
Do you have static and public IP at home?
I don't know if gandi supports ddns, it is not mentioned in the list. That would make the update of the wan IP more difficult, but not impossible.
I have setup my ISPs modem as bridge and a Linksys for pppoe and router work.
My ISP provides me with a dynamic changing IP address.
What I found about Gandi is that offers an api service for this change.
Iam learning now this process.
Well I see,
its public now. It used to be private but I called ISP and changed to public, I have tested a while ago and i can see my web service from outside lan with the ISPs ip.
Your router knows the public IP address firsthand, and when it changes; your computer doesn't.
How is possible to see my public IP from luci or from cli; I use a Linksys acs1900 router with the wan setup as pppoe
On the "Network" > "Interfaces" page.
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