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AWS Windows Transit Gateway Multicast Setup Guide

This guide explains how to enable multicast for EC2 instances using AWS Transit Gateway. EC2 instances must be launched in a subnet associated with the multicast domain.

1. Create a Subnet​

Go to:

VPC → Subnets → Create subnet

  • Select the VPC that will contain the EC2 instances.
  • Enter a subnet name.
  • Select an Availability Zone.
  • Enter an unused IPv4 CIDR block within the VPC range.
  • Select Create subnet.

2. Create a Transit Gateway​

Go to:

VPC → Transit Gateways → Create Transit Gateway

  • Enable Multicast support.
  • Create the Transit Gateway and wait for its status to become Available.

3. Create a VPC Attachment​

Go to:

VPC → Transit Gateway Attachments → Create attachment

  • Set Attachment type to VPC.
  • Select the Transit Gateway.
  • Select the VPC.
  • Select the subnet created above.
  • Create the attachment and wait for its status to become Available.

4. Create a Multicast Domain​

Go to:

VPC → Transit Gateway Multicast → Create multicast domain

  • Select the Transit Gateway.
  • Set IGMPv2 support to Enabled.
  • Set Static sources support to Disabled.
  • Create the multicast domain.

5. Associate the Subnet​

Open the multicast domain and go to:

Actions → Create association

  • Select the VPC attachment.
  • Select the subnet containing the EC2 instances.
  • Create the association.
note

Multicast domain membership is configured at the subnet level.

6. Launch the EC2 Instance​

Go to:

EC2 → Launch instance

Under Network settings → Edit:

  • Select the same VPC.
  • Under Subnet, select the subnet associated with the multicast domain.
  • Select the required Security Group.
  • Launch the instance.

7. Configure IGMPv2​

On each Windows EC2 instance, open PowerShell as Administrator and run:

Set-NetIPv4Protocol -IGMPVersion Version2