AWS VPC Peering

• When we create a peering connection from one vpc to another vpc (once approved), a peering connection object will be created in both vpcs.
• VPCs can be in the same region/different region, same account/different accounts. Peering will work as long as there cidr ranges dont collide.
• The basic overview is as shown below
  
• As of now we have two vpcs, where we can ping each other by public ip
  

Creating a Peering Connection

• Steps for creating a peering connection:
  
  
  
  
• Modify the Route tables in one vpc (oregon)
  
  
• Now navigate to other vpc where the peering connection needs to be approved (mumbai)
  
  
  
  
• Now modify the route table in other region (mumbai) to forward the packets (to oregon)
  
  

Verifying connectivity

• Login into one ec2 instance created and ping other ec2 instance in a different vpc using private ip
  
• We have established the connectivity.

Cleaning up

• Remove the following in order
• Router rules
• Peering connection
• ec2 instances
• vpc
• screen shots