SAP System Connectvity with External IP

Hi All,

We have a Production System in a clustered enviornemnt. Central Instance with a Primary Database and a Secondary Database. There are two Application Servers.

So overall 5 IP Address for 5 servers. There is a requirement from an external system to fetch the files stored in the production system and store to their system. The network team have identified that there will be a requirement of an external ip address to establish the connectivity of the production system.

So will I have to share all the five IP Addresses or just sharing the IP Address of the Central Instance will be enough considering the landscape.