aws - Connect two private subnets? I'm testing some cloudformation infrastructure templates, and I noticed that most of the examples include routing tables to connect private subnets to public subnets, but my question then is:

if two private subnets exist in different AZs (and are attached to individual routing tables) and the resources within them may need to access a resource on the other subnet (for example a private service on the subnet 1 accessing a database on the subnet 2)


Should I create a route to connect the two private subnets in each of their routing tables?
Would it be a better practice to attach both subnets to a single shared routing table (both CIDRs are contiguous)?
Are they in the same VPC? If yes it should just work as the VPC CIDR route will take care of all the subnets intercommunication.