How to check the default route on private and isolated subnets?

Question

I am trying to use [describe_route_tables](https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/ec2.html) on boto3 to describe routes that are going to a particular subnet and going to a particular gateway/network firewall.

Furthermore, is there a way to check the default route in a subnet? Using bogo3?

Brettski · Answer

The default route is no different to any other route - there's no special marker for it. Look for a route that has a `DestinationCidrBlock` of `0.0.0.0/0` - that's the default route.

Muhammad · Answer

You can use that boto3 command. You can further use this filter to only grep default route

route.destination-cidr-block

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How to check the default route on private and isolated subnets?

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