RB951G-2HnD - DUAL Wan Static IP

Hello,
I have RB951G-2HnD.
I want to configure two ISP’s.
Have nisp as a primary isp and aisp as a secondary.
Both isp have static public ip.
I want my router public ip address to be always that from nisp - regardless if aips is in use, my public ip should be that from nisp.
My router lan is 192.168.1.0/24.
Thanks

So you dont want to use the throughput of the secondary WAN at all?
Just the primary router… is that becasue the secondary WAN is of little throughput?

If the primary goes down, then you will have to use the second WAN, and it will not be possible to hide this fact.

If for some circumstances, nisp fails, i want to use aisp - but to preserve public static ip of the nisp? Can i managed this from my router - and how?
Tnx

That won’t work, unfortunately. You can’t use the public IP from nisp while sending traffic through aisp, since they’re on different networks and ISPs only route IPs they own. If you try, traffic will just get lost.

A better option is to use a dynamic DNS record with a short TTL (time to live), like for example “www.mysite.com”. That way, when you switch to aisp, you just update the new address for “www.mysite.com” and clients will get the new IP. There are plenty of free dynamic DNS services out there, and lots of example scripts that can automatically update the record when your IP changes.

Objective still not fulfilled LARSA, the response from the secondary WAN will still have a source IP of the secondary WAN.