Question

A workload on VM-A (subnet 10.0.1.0/24) cannot reach an internal passthrough Network Load Balancer VIP in another VPC connected via VPC peering. You run a Connectivity Test from VM-A to the VIP, and the test reports 'Reachable' for the forward path. However, actual application traffic still times out. You suspect an asymmetric routing or return-path problem. Which action within Network Intelligence Center best confirms the return-path issue?

Accepted Answer

Run a second Connectivity Test with the source and destination reversed (from the backend/VIP side toward VM-A) to evaluate the return path independently.

Answer

Increase the VPC Flow Logs sampling rate to 100% on VM-A's subnet and wait for the timeout to appear in logs.

Answer

Enable Firewall Rules Logging on VM-A's egress rule and confirm packets are being allowed outbound.

Answer

Review the Performance Dashboard for packet loss between the two Google Cloud regions hosting the VPCs.