VMSS Scalet Set single load balancer deployment. How to set default route using bash script?

[J_Saun]

We have a multi tier Azure environment that has several scale sets. We only want one of those to face the internet and process inbound/outbound internet traffic. All other vmss will need to default to the Internet facing vmss. We were told that we should deploy these non-internet facing vmss with a single load balancer and add a bash script to the deployment config in Azure to set the default route to the internal load balancer.

I dont have access to the Azure console so I need to direct them on how this is accomplished.

- what will the bash script look like?

- where in Azure do they apply it?

Thanks