GCP peering to access private LDAP

MongoDB Atlas
1

It’s indicated in the documentation that Clients can't connect to Atlas clusters with Google Cloud VPN (Virtual Private Network) or Interconnect because Atlas doesn't accept custom routes when VPC peering connections are created.

What about the other way around? I’m trying to connect to our private LDAP endpoint from the MongoDB cluster but on the GCP peering, the custom routes to this LDAP is not accepted by Atlas, as expected.
How can we achieve to reach our private LDAP endpoint in that particular case?

2

Jonathan, you may want to open a support case

3

Thanks for your message.
In the meantime, I figured it out with the help of one member of Atlas support.
Turns out that it’s impossible for an atlas cluster on GCP to reach a private endpoint (our LDAP) through a VPN connection (cloud VPN).
This is because the peering between the atlas GP project and our GCP project does not accept our custom routes so no hop is possible for the atlas cluster to reach our LDAP.