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.
What Is AWS VPC Route Table?
An AWS VPC Route Table is a set of rules that determine where the network traffic from your subnet or gateway is directed. Each subnet (range of IP addresses in your VPC) is associated with a route table that controls the traffic flow between subnets. A route table has a destination address which determines where the network is directed. Route tables are essential when dealing with IPv4/IPv6 CIDR blocks, private or public subnets, network gateways, VPC endpoints, etc.