How to allow Web/Worker roles access to VM on an VNet?

Hello,

I want to allow service on virtual machines to be accessable by Worker and Web roles, suggestions are this is done using Vnet.

So, I have created a Vnet and added a VM into that VNet.  I also have a Worker role that I want to be able to access services on the VM. All in same DC and AG.

How do I configure the Worker role to have access to the Vnet and therefore the VM?

Many Thanks

Andy