Steps To Create and Configure Route Table

Components of a Route Table

Entries: Each route entry specifies a destination CIDR Block and a target. Route Table ID: A unique identifier used to manage the route table through API calls, CLI commands, and the Management console. Associations: Associations specify which subnet uses the route present in the route table for the traffic. Target: Specifies where a network should be directed. For example, internet gateway, virtual private gateway, NAT gateway, etc. Destination CIDR Blocks: Range of IP addresses where you want your traffic to go to a particular destination which is represented in CIDR Block (eg. 192.0.0.0/16)....

Creation of a Route table

Click on ‘Create Route Table’ under the VPC dashboard. Click on the main route table which AWS by default creates for your VPC. You can also create a custom route table as well. You can then associate the subnets in the route table under Subnet Associations....

Default Route Table vs. Custom Route Table

Default Route Table: When you create a VPC, AWS automatically creates a default route table for that VPC. The main or default route table can have both implicit and explicit subnet associations. Subnets are automatically associated with the default table. It controls the routing for all subnets. It is pre-configured with a local route for VPC communication....

Steps To Create and Configure Route Table

Route tables are used for the creation of different routes between subnets and gateways. There are a number of examples like routing traffic between AWS resources and on-premises networks via VPN or Direct connect, route tables with internet access, custom route table for public/private subnets with NAT gateway. We’ll be discussing the step-by-step creation and configuration of route tables for different use cases :...

Routing Decision Example

The example given below demonstrates how a route table defines the routing decisions within a VPC....

Full Form Of IGW,PCX and VGW

Local – Indicates local traffic (traffic within the same VPC). IGW – Allows instances in the VPC to access the internet through the Internet Gateway. PCX – Indicates peering connection allowing communication with another VPC through VPC peering. VGW – Provides connectivity to an on-premises network via a VPN connection through the virtual private gateway....

Understanding Subnet Routing

Subnet Association: Each subnet can only be associated with one route table at a time. Route Priority: Ensures routes are evaluated in priority order. Order is set by you. Default Route: Handles unknown destinations. Security: Implements security using security groups and network ACLs. Route Table Limits: A limited number of route table can be only be created per VPC. Route Propagation: Enables automatic propagation of routes from a gateway to a route table....

Conclusion

The VPC route tables serves a crucial role of networking between the VPC as it directs the flow of traffic between subnets and gateways. While dealing with AWS VPC, having a knowledge of the components and creation of route table is important for managing network traffic within the AWS environments....

VPC Route Table – FAQs

What is role of AWS VPC route table?...