Hello, I am currently hosting my front-end on Vercel, backend on fly.io, and database on MongoDB. I paid for the dedicated IPv4 address so I could whitelist it in MongoDB for network access and after printing the IP address, the request is coming from it is not within the range of the shared IPv4 addresses nor is it the dedicated address. MongoDB does not allow IPv6 addresses, and my servers are now able to communicate with each other, but I am not sure where the IPv4 address is coming from.
the solutions in this thread may be helpful: Outbound Traffic Using IPv6 Instead of IPv4
Thank you! I resolved my issue with static egress IPv4 addresses you can allocate on your machines for free.
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