AWS - Transit Gateway

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In this post, We will see what is an AWS Transit Gateway. In the last post, we saw about VPC peering. One of the major problems with VPC peering is creating a peering connection as VPC's grows.



Imagine you have 3 VPC's A, B and C with peering as A -> B and B -> C. You cannot connect from VPC-C to VPC-A via VPC-B.

This problem is addressed via Transit Gateway. This is like a typical L3 Router where it learns about the network(VPC) it is associated with and updates the route table accordingly.


We have 2 VPC's.

VPC1 - 10.0.0.0/16 -> Subnet -> 10.0.1.0/24
VPC2 - 198.0.0.0/16  -> Subnet -> 198.0.1.0/24

I have created two Internet Gateways and attached them to VPC1 and VPC2.

Updated the routing table of VPC1 to reach 0.0.0.0/0 via Internet Gateway1 and VPC2 to reach 0.0.0.0/0 via Internet Gateway2.

The above discussed are basic steps. So, I am going to proceed with creating a Transit Gateway.


Once TGW(Transit Gateway) is created. Proceed to create a TGW attachment. 

Imagine a TGW attachment as a cable to connect VPC to TGW.

So, I have two TGW attachments VPC1 -> TGW and VPC2 -> TGW.



Repeat the same for other VPC.


Both attachments are ONLINE. TGW will have a route table attached to it.




We are done with the TGW setup.

Finally, We need to update the VPC route table as below:





Now, I have 2 Ec2 instances created one per VPC. We will try to telnet Ec2 on port 22 from VPC1 to VPC2.


Yay!!! 

FYI: I already updated the security group to allow incoming traffic on port 22.







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