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You are correct, Unlike NLB, ALB does not currently support Source IP based stickiness, currently only supported option is cookie based stickiness, below section from the documentation.
By default, an Application Load Balancer routes each request independently to a registered target based on the chosen load-balancing algorithm. However, you can use the sticky session feature (also known as session affinity) to enable the load balancer to bind a user's session to a specific target. This ensures that all requests from the user during the session are sent to the same target. This feature is useful for servers that maintain state information in order to provide a continuous experience to clients. To use sticky sessions, the client must support cookies. Application Load Balancers support both duration-based cookies and application-based cookies
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