When I create an RDS, it seems to have an inbound source by default.
For example, like port: 5432, IP: 188.8.131.52/32.
As I understand, It means that the security group allows requests from the IP range(184.108.40.206/32) to access the port(5432).
Somehow It seems to allow my local to access the RDS as well without any additional inbound source representing my local.
In contrast to my local, when I try to have access to the RDS from Lambda, I have had to add inbound source 0.0.0.0/0, otherwise, the Lambda has returned a timeout error.
My question is...
What does the IP range(220.127.116.11/32) mean?
How does it allow my local to access the RDS?
Why does it deny Lambda but my local?