Suppose we have an application running on an EC2 instance in a load-balanced Elastic Beanstalk stack. And this application wants to (1) call web services served by external hosts, and/or (2) open secured TN5250 (i.e, 5250 data stream over SSL-secured Telnet) sessions on external hosts.
Is there a way we can give those external hosts a reliable IP address range from which to expect our traffic?
(Cross-posted to the AWS EC2 developer forum.)