Health Check for GKE cluster pods

Cluster information:

Kubernetes version:1.16.15
Cloud being used: GCP
Installation method: yaml
Host OS: NA
CNI and version:
CRI and version:

my environment blocks the health check probe source ranges. I need to open the standard probe source IP ranges. What I need clarity on is which of my network or networks I need to allow the health checks to.

my gke cluster nodes and internal tcp load balancer get IP’s from my primary network. I’m assuming this is the only network I need to provide to open firewall to the health probes. However, I’m unclear on the pods inside the nodes in this cluster. The pods get a 100.x.x.x address; do I need to specify this pod alias subnet as well?