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fix: document skipDefaultNatRoute in the README #36

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iamkinchit merged 1 commit into from
Oct 27, 2026
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fix: document skipDefaultNatRoute in the README #36

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23 changes: 23 additions & 0 deletions README.md
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Expand Up @@ -197,6 +197,29 @@ app.synth();
```
Please refer [here](/API.md) to check how to use individual resource constructs.

## Pinning egress to a single NAT gateway

By default every private subnet gets an automatic `0.0.0.0/0` route to the NAT gateway in its own AZ. Set `skipDefaultNatRoute: true` on a subnet group to opt out, and declare your own default route so all AZs of the group egress through one NAT gateway:

```typescript
{
subnetGroupName: 'PocSingleNat',
subnetType: ec2.SubnetType.PRIVATE_WITH_EGRESS,
cidrBlock: ['10.0.112.0/20', '10.0.128.0/20', '10.0.144.0/20'],
availabilityZones: ['ap-south-1a', 'ap-south-1b', 'ap-south-1c'],
skipDefaultNatRoute: true,
routes: [
{
routerType: ec2.RouterType.NAT_GATEWAY,
destinationCidrBlock: '0.0.0.0/0',
routerId: 'nat-0123456789abcdef0', // the single NAT gateway
},
],
}
```

Traffic from the other AZs crosses AZ boundaries to reach that NAT gateway (cross-AZ data charges apply), and that NAT's AZ becomes a single point of failure for the group.

## Route 53 hosted zones

Hosted zones are modeled separately from the `Network` construct. For private
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