GCP Flow Log Access IP Addresses
Illumio Segmentation for the Cloud uses TCP port 443 to access your flow logs, so open that port for the IP addresses listed in this section.
Illumio Data Plane for all GCP
The Illumio Segmentation for the Cloud control and data plane uses the following public IP addresses to reach customer networks, so add them to your firewall inbound/outbound allowed list:
52.183.73.40
52.148.136.248
20.191.118.116