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Hi Sam.
Is there a reason you can't just create the DB link and test it? You can always delete it if it doesn't work.
Also, have you tried using VCP Reachability Analyzer? If not, I'd recommend you take a look at the following Blog post which explains in detail how to troubleshoot (test in your case) network connectivity to RDS databases.
I hope this helps.
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You can create an EC2 instance from the source RDS subnet and perform testing on the instance using common Linux or Windows Tools, such as SQL Workbench/J.
https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/CHAP_Troubleshooting.html
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Unfortunately I can not create another EC2 in same subnet to test connectivity. It requires reuest, approvals, security and most likely they wont approve. Is not there a way to do via SQL command in Oracle SQL Developer?