Control egress and ingress traffic

Control egress and ingress traffic to a VPN tunnel on a per-project basis.

• By default, all projects will deny incoming traffic from a VPN tunnel.
• By default, projects with data exfiltration protection enabled will deny outgoing traffic to a VPN tunnel.

Use the following directions to change the default VPN traffic egress and ingress rules for a project.

Configure ingress traffic

By default, all projects will deny incoming traffic from a VPN tunnel. To enable a project to allow traffic from a VPN tunnel, use a ProjectNetworkPolicy object which targets the routes received over the Border Gateway Protocol (BGP) session used on the VPN tunnel:

Note: These steps require access to the project-networkpolicy-admin role.

1. Retrieve all received routes from the VPNBGPPeer status in question:

   kubectl --kubeconfig ORG_ADMIN_CLUSTER_KUBECONFIG get -n platform vpnbgppeer
   VPN_BGP_PEER_NAME -ojson | jq '.status.received'
   

   Replace the following:

   • ORG_ADMIN_CLUSTER_KUBECONFIG: the org admin cluster's kubeconfig path.
   • VPN_BGP_PEER_NAME: the name of your VPN BGP session.

   For more information, see Create a VPN BGP session.

   The output looks like the following example:

   [
     {
       "prefix": "192.168.100.0/24"
     }
   ]
   

2. Add all of the received routes from the VPNBGPPeer status to a ProjectNetworkPolicy object in the namespace of the project in question:

   kubectl --kubeconfig ORG_ADMIN_CLUSTER_KUBECONFIG create -n PROJECT_NAME -f - <<EOF
   apiVersion: networking.gdc.goog/v1alpha1
   kind: ProjectNetworkPolicy
   metadata:
     name: allow-ingress-vpn-traffic
   spec:
     policyType: Ingress
     subject:
       subjectType: UserWorkload
     ingress:
     - from:
       - ipBlock:
           cidr: 192.168.100.0/24
   EOF
   

Replace PROJECT_NAME with the name of your GDC project.

Configure egress traffic

By default, a project with data exfiltration protection enabled will deny sending traffic to the VPN.

You can allow a project to send traffic to a VPN tunnel by disabling data exfiltration protection for the project. For more information, see Prevent data exfiltration.

Access the user VM

Hosts in the remote network with a VPN tunnel connection to a GDC organization can access the primary interface of organization user VMs, assuming egress and ingress traffic to the project containing the user VM is allowed.

Note: To perform these steps, you must have access to the Project VirtualMachine Admin (project-vm-admin) role in the namespace of the project where the VM resides.

Follow these steps to access the primary interface of the user VM:

1. Get the interfaces of the user VM by viewing its respective VirtualMachine object in the org admin cluster:

   kubectl --kubeconfig ORG_ADMIN_CLUSTER_KUBECONFIG get -n PROJECT_NAME
   gvm VM_NAME -ojson | jq '.status.received'
   

   Replace VM_NAME with the name of the VirtualMachine object.

   The output looks like the following example:

     [
       {
         "ipAddresses": [
           "172.16.19.189"
         ],
         "macAddress": "8a:fc:81:0b:41:dc",
         "name": "eth0"
       },
       {
         "ipAddresses": [
           "172.20.128.15/21"
         ],
         "macAddress": "56:1b:07:85:50:b3",
         "name": "eth1"
       }
     ]
     ```
   

2. Hosts in the remote network with a VPN tunnel connection to a GDC organization can access user VMs through the primary eth0 interface:

   /home/ubuntu# ssh -i ~/vm-access user@172.16.19.189
   

   Note, for SSH access details including retrieving a key for a VM, see Connect to a VM.