Routing Across AWS Subnets

Fri, 31 May 2024 17:00:00 -0400

This morning at work I was presented with an interesting question: why can’t two instances in AWS seem to talk to each other on their internal / private network interfaces? To answer this, let’s back up a second and let me show you what the architecture of the environment is. First, take a moment and look at the diagram below and observe not only how many layers there are, but also that this is a pretty simple setup with one VPC containing two instances that are spread across two Availability Zones:

Aws on The Comfy Seat

Routing Across AWS Subnets