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Dinesh_gowtham
Dinesh_gowtham

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VPC Lattice Is a Game-Changer for Service-to-Service Networking — But Beware the NAT Gateway Penalty

#serverless #aws #lambda #vpc

AWS VPC Lattice has revolutionized service-to-service networking without load balancers, but our team encountered a unexpected surprise that added 30% to our VPC costs. Here's the hidden penalty that nobody warned us about and how we mitigated it.

Introduction to VPC Lattice

VPC Lattice simplifies service networking by providing a managed service that enables secure, fine-grained access to services within a VPC. To get started, you need to create a VPC Lattice and configure its settings.

import { CreateVpcLatticeCommand } from '@aws-sdk/client-ec2';

const createLatticeCommand = new CreateVpcLatticeCommand({
  VpcLatticeName: 'my-vpc-lattice',
});

// Execute the command
const lattice = await createLatticeCommand.send();
console.log(lattice.VpcLattice);
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Be aware that VPC Lattice is not a replacement for traditional VPC networking. You still need to understand the underlying networking concepts to use it effectively.

The NAT Gateway Conundrum

The NAT Gateway penalty is a significant issue when using VPC Lattice with Lambda functions that require internet access. By default, VPC Lattice does not provide internet access, so you need to configure a NAT Gateway to enable it.

import { CreateNatGatewayCommand } from '@aws-sdk/client-ec2';

const createNatGatewayCommand = new CreateNatGatewayCommand({
  SubnetId: 'subnet-12345678',
});

// Execute the command
const natGateway = await createNatGatewayCommand.send();
console.log(natGateway.NatGateway);
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Watch out for the error "Failed to create NAT gateway: subnet is not available" if the specified subnet is not available. Make sure to check the subnet's availability before creating the NAT Gateway.

Mitigating the NAT Gateway Penalty

To mitigate the NAT Gateway penalty, you can use a single NAT Gateway for multiple subnets or configure a NAT instance instead of a NAT Gateway. However, be aware of the error "NAT instance is not supported in this Availability Zone" if the specified Availability Zone does not support NAT instances.

import { CreateNatInstanceCommand } from '@aws-sdk/client-ec2';

const createNatInstanceCommand = new CreateNatInstanceCommand({
  InstanceType: 't2.micro',
  SubnetId: 'subnet-12345678',
});

// Execute the command
const natInstance = await createNatInstanceCommand.send();
console.log(natInstance.NatInstance);
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Be cautious of the cold start penalty when using Lambda functions with VPC Lattice. The cold start can be significant, and using a NAT Gateway or NAT instance can add to the overall latency.

Best Practices for VPC Lattice Adoption

When adopting VPC Lattice, make sure to follow best practices to avoid common pitfalls. One common issue is hitting the security group limits (60 inbound rules) when using complex microservice setups.

import { CreateSecurityGroupCommand } from '@aws-sdk/client-ec2';

const createSecurityGroupCommand = new CreateSecurityGroupCommand({
  GroupName: 'my-security-group',
  Description: 'My security group',
});

// Execute the command
const securityGroup = await createSecurityGroupCommand.send();
console.log(securityGroup.SecurityGroup);
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Be aware that VPC Peering is not transitive. If you have a complex network setup, make sure to draw the correct network diagram to avoid confusion.

The Future of Service-to-Service Networking

The future of service-to-service networking looks promising with VPC Lattice and other managed services. However, be aware of the IPv4 address pricing ($0.005/hr) and consider using IPv6 addresses instead.

import { AssociateAddressCommand } from '@aws-sdk/client-ec2';

const associateAddressCommand = new AssociateAddressCommand({
  InstanceId: 'i-12345678',
  AllocationId: 'eipalloc-12345678',
});

// Execute the command
const association = await associateAddressCommand.send();
console.log(association.AssociationId);
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Watch out for the error "AddressLimitExceeded: You have reached the maximum number of addresses for this instance" if you exceed the maximum number of addresses for an instance.

The Takeaway

Here are some key takeaways from our experience with VPC Lattice:

  • Use a single NAT Gateway for multiple subnets to reduce costs.
  • Configure a NAT instance instead of a NAT Gateway for better performance.
  • Be aware of the cold start penalty when using Lambda functions with VPC Lattice.
  • Use IPv6 addresses instead of IPv4 addresses to avoid paying for IPv4 address pricing.
  • Draw the correct network diagram to avoid confusion with VPC Peering.
  • Monitor your security group limits (60 inbound rules) to avoid hitting the limit.

By following these best practices and being aware of the common pitfalls, you can effectively use VPC Lattice for service-to-service networking and avoid unnecessary costs.

Transparency notice

This article was generated by an AI system using Groq (LLaMA 3.3 70B).
The topic was scouted from live AWS and Node.js ecosystem signals, and the content —
including all code examples — was written autonomously without human editing.

Published: 2026-06-02 · Primary focus: VPC

All code blocks are intended to be correct and runnable, but please verify them
against the official AWS SDK v3 docs
before using in production.

Find an error? Drop a comment — corrections are always welcome.

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