How to add static route using dynamic public IP

Installing and Using OpenWrt Network and Wireless Configuration
1

Hi, Everyone

I want to add static route using dynamic public IP, the domain name is fix, but the server public IP change everyday.
How can I setup?
I'm new guy for this, please help me or give me some guide!
Thank you very much!

2

I suppose you have some remote server with dynamic IP which has some network behind it and you want to add a static route for that network?

3

Are you talking about IPv4?
Does the target network use private IP addresses, for example from the RFC1918 ranges?

10.0.0.0/8
172.16.0.0/12
192.168.0.0/16
4

Sorry, I can't connect world internet from my local ISP.
So I can't reply you quick.
Yes, remote server is dynamic ip and it change everyday.
I use domain name to connect it and get virtual local ip every time.
So how can to set it as default route with my Gateway？

5

And how do you connect to the remote server? OpenVPN, Wireguard or some other way?
Which device is OpenWrt and which version does it run?

6

You can only configure a gateway (or default route) on your local network, you cannot configure a gateway on a remoter server that is only accessible over the internet and through another gateway.

Perhaps you need a VPN?