VMware Cloud on AWS - VMs running on VMC can't communicate with connected Amazon VPC network

Products

• VMware Cloud on AWS

Issue/Introduction

This article provides information on how to resolve issues if you find connection problem between VMC on AWS and connected Amazon VPC network.

Symptoms:

• Connections from VMs running on VMC to connected Amazon VPC network fail and vice versa.
• The status of all routes to the VMC network is shown as "blackhole" in the main route table in connected Amazon VPC.
• The "Active Network Interface" id shown in VMC portal is different from the ENI id shown in the main route table in connected Amazon VPC.

Cause

The established link between VMC and connected AWS VPC will be broken if the necessary role named "vmware-sddc-formation-xxxxxxxx-xxxx-xxx-RemoteRole-xxxxxxxxxxxx" is removed accidentally in your IAM roles. This causes VMC preventing to update the main route table in connected Amazon VPC.

Resolution

To resolve this issue, the following two steps have to be done.

1. Re-establishing the link between your organization and Amazon VPC network.
2. Re-establishing the link between your SDDC and Amazon VPC network.

1. Re-linking between your organization and Amazon VPC network.

• Login to https://vmc.vmware.com
• Select "VMware Cloud on AWS"
• Click "CREATE SDDC" button
• Enter a temporary name in "SDDC Name" field and click "NEXT" button
• Select "Connect to AWS now" and choose "Connect to a new AWS account"
• Click "OPEN AWS CONSOLE WITH CLOUDFORMATION TEMPLATE" button
• Login to AWS console after the page transition
• Select "I acknowledge that AWS CloudFormation might create IAM resources" and click "Create" button
• Wait for the stack creation to be completed

Note: You don't have to create a new SDDC. You can quit after the stack creation on AWS side.


2. Re-establishing the link between your SDDC and Amazon VPC network.
Please contact VMware support with the details after you performed the No.1 since the No.2 has to be done from VMware side.

Additional Information

Deploying and Managing a Software-Defined Data Center:
https://docs.vmware.com/en/VMware-Cloud-on-AWS/services/com.vmware.vmc-aws-operations/GUID-BC0EC6C5-9283-4679-91F8-87AADFB9E116.html