Hmm how did you calculate the DC to be $288 for total of two?
I believe you can use AD connector to connect to on-premise AD.
I believe you can use AD connector to connect to on-premise AD.
It looks like AD Connector is much less: https://aws.amazon.com/directoryservice/other-directories-pr...
$0.12 * 24 * 30 = $86.40/month.
I'd change the statement in my parent post, but I don't seem to be able to edit it.