Actually, I just thought of something I noticed when Google Cloud Run launched. When I accessed a Google Cloud Run URL from a VM with no public IP (using their

Actually, I just thought of something I noticed when Google Cloud Run launched. When I accessed a Google Cloud Run URL from a VM with no public IP (using their private Google access function), the X-Forwarded-For header sent to the container was a private IPv6 address that included the instance's private IPv4 address embedded in it. So I wonder if the Private Google Access mechanism uses some sort of IPv4 to IPv6 translation in their internal network in order to route the request, and maybe some detail of that implementation makes it difficult to route request from public v6 addresses to Google v6 addresses on GCE. I just tried this again, and it looks like the X-Forwarded-For header now returns 0.0.0.0 when accessed from a VM without a public IP. Could be a sign that a fix is in the works?