When looking at how to configure networking for interactions between a VMware Cloud on AWS SDDC and an Amazon VPC there is a little bit to grasp in terms of what needs to be done to achieve traffic flow between the SDDC and the rest of the world.
As an example, by default if you want to connect to S3 the default configuration is to go through the Amazon ENI (Elastic Network Interface) which means that unless configured correctly, connectively to Amazon S3 will fail. Brian Gaff has a really good series of posts on Networking and Security Groups when working on VMware Cloud on AWS and are worth a read to get a deeper understanding of VMC to AWS networking.
There is a way to change this behaviour to make connectivity to Amazon S3 connect via the SDDCs Internet Gateway. This is done through the VMware Cloud Portal by going to the Networking section of the relevant SDDC.Doing this, while easy enough means that you loose a lot of the benefits that passing traffic through the ENI provides. That is a high-bandwidth, low latency connection between the VPC and the SDDC which also provides free egress. In the case of S3 and the utilising the Veeam Cloud Tier it means more optimal connectivity between a Veeam Backup & Replication instance hosted in the SDDC and Amazon S3.
To allow communication between the SDDC and Amazon S3 over the ENI the following needs to be actioned.
First step is to go into the AWS Console, go to the VPC thats connected to the VMC service and create a new Endpoint for S3 as shown below making sure you select the correct Route Table.
Configure Security Group:
Next is to configure the Security Group associated with your VPC to allow traffic to the logical network or networks. It’s a basic HTTPS Inbound rule where your source is the SDDN network or networks you want access from.
The final step is to configure a firewall rule on the SDDC Compute Gateway to allow HTTPS traffic to the Amazon VPC from the network or networks you want access to Amazon S3 from.
That’s pretty much it! After that, you should be able to access Amazon S3 over the ENI and get all the benefits that delivers.