AWS VPC Route Table Examples Route Table Route Propagation

AWS VPC Route Table Examples Route Table Route Propagation

AWS Vpc  Route tables

To route traffic from the subnet to any destination there must be a rule defined in the route table which can determine where to send the traffic.

  • There is a route table created when you create a vpc. Which contains a default route to make communication in vpc possible.
  • If you want, you can create a custom route table inside your vpc.
  • You can then associate the route tables to the subnet to make the flow of traffic possible.

In aws we must need a vpc in order to create instances. A vpc has an implicit router, which is used to control the flow of traffic. Every subnet must be associated with one route table. You can attach one route table to many subnet but can not attach many route tables to one subnet.

Routes

In every route table, we have to specify routes, which consist of a destination field and target field.

For example for accessing the internet, we can add 0.0.0.0/0 as a destination, and internet gateway as target. Which will route the traffic coming for 0.0.0.0/0 to the internet gateway.

Main Route Table

When you create a VPC, it automatically has a route table. Which controls the routing for all the subnets which don’t have any explicit route table attached.

If you create a custom vpc, by default the main route table contains an only local route.

Custom Route Table

By default, if you make a custom route table, it’s empty. You can add routes as needed.

Here is an example to create a custom route table, add routes and associating it with the subnet. 

Creating a Custom Route Table

  1. Open VPC Console
  2. In the navigation pane -> choose Route Table
  3. Choose Name Tag, VPC ID
  4. Choose Create

Adding Routes to Route Table

  1. Open VPC Console
  2. In Navigation Pane -> choose Route Tables
  3. Choose Actions -> Edit Routes
  4. To add a route, Choose Add Route -> Specify Destination, Target
  5. Choose Save Routes

Associating Route Table to a Subnet

    1. Open the VPC console
    2. In the navigation pane -> choose Subnets
  • Route Table tab -> choose Edit route table association -> Specify Route Table ID

Choose Save

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