This section provides design patterns for connecting remote networks with your Amazon VPC environment. These options are useful for integrating AWS resources with your existing on-site services (for example, monitoring, authentication, security, data or other systems) by extending your internal networks into the AWS Cloud.| docs.aws.amazon.com
Amazon Virtual Private Cloud (VPC) is a service that lets you launch AWS resources in a logically isolated virtual network that you define.| Amazon Web Services, Inc.
Bringing scale to your applications with IPv6 on AWS| Amazon Web Services, Inc.
TL;DR: Use use_vmac directive in keepalived when using multicast and your carrier allows multiple MAC addresses per interface. If that’s not an option, migrate away from netplan/systemd-networkd, e.g. to ifupdown.| chr4