The tables here show the network communication paths to container-to-container networking in VMware Tanzu Application Service for VMs (TAS for VMs).
For more information about container-to-container networking, see Container-to-container networking.
Inbound communications
The following table lists network communication paths that are inbound to container-to-container networking.
| Source VM | Destination VM | Port | Transport Layer Protocol | App Layer Protocol | Security and Authentication |
|---|---|---|---|---|---|
| diego_cell (Silk CNI) | diego_cell (Silk Daemon) | 23954 | TCP | HTTP | None |
| diego_cell (Silk Daemon) | diego_api (Silk Controller) | 4103 | TCP | HTTP | Mutual TLS |
| diego_cell (VXLAN Policy Agent) | diego_database (api - Policy Server Internal) | 4003 | TCP | HTTP | Mutual TLS |
| diego_cell (BOSH DNS Adapter) | diego_brain (Service Discovery Controller) | 8054 | TCP | HTTP | Mutual TLS |
Outbound communications
The following table lists network communication paths that are outbound from container-to-container networking:
| Source VM | Destination VM | Port | Transport Layer Protocol | App Layer Protocol | Security and Authentication |
|---|---|---|---|---|---|
| diego_database (API - Policy Server) | uaa | 8443 | TCP | HTTPS | TLS |
| diego_database (API - Policy Server) | cloud_controller (api - Cloud Controller) | 9022 | TCP | HTTP | OAuth 2.0 |
| diego_database (API - Policy Server) | mysql_proxy* | 3306 | TCP | MySQL | MySQL authentication |
| diego_brain (Service Discovery Controller) | nats (NATS) | 4222 | TCP | HTTP | Basic authentication |
| diego_cell (BOSH DNS) | diego_cell (BOSH DNS Adapter) | 8053 | TCP | HTTP | None |
| diego_cell (VXLAN Policy Agent) | mysql_proxy* | 3306 | TCP | MySQL | MySQL authentication |
*Applies only to deployments where internal MySQL is selected as the database.
BOSH DNS communications
By default, TAS for VMs components and app containers look up services using the BOSH DNS service discovery mechanism. To support this lookup, BOSH Director co-locates a BOSH DNS server on every deployed VM. For more information, see BOSH DNS network communications.
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