Centralizing DNS Firewall

Domain expertise for applying one Route 53 Resolver DNS Firewall configuration across many VPCs and accounts. DNS Firewall supplies the rules. There are two distinct fan-out mechanisms, and you pick one: Route 53 Profiles (shared cross-account with AWS Resource Access Manager) bundle the rule groups with other DNS config and associate them to VPCs; AWS Firewall Manager centrally creates and manages DNS Firewall rule group associations across an organization’s accounts and flags non-compliant accounts. Firewall Manager is not a layer on top of Profiles — using both for the same rule groups double-associates them to the same VPCs.

Does not cover authoring DNS Firewall rules for a single VPC, or general Profile configuration. Those are separate skills.

Execute commands using the AWS MCP server when connected (sandboxed execution, audit logging, observability). Fall back to the AWS CLI otherwise.

Table of Contents

• Overview
• Workflow
• Rules, and two ways to fan them out
• Decision: RAM share permission level
• Troubleshooting
• Procedure
• Additional Resources

Workflow

To centralize DNS Firewall across the fleet, follow the procedure exactly. See the Procedure section below.

The procedure covers:

• Bundling DNS Firewall rule groups into a Route 53 Profile rather than configuring per VPC
• Sharing the Profile cross-account through RAM at the right permission level
• Associating the Profile with VPCs in each account
• Optionally using AWS Firewall Manager instead, for org-wide association management and compliance detection
• Surfacing the console links to verify the result

Rules, and two ways to fan them out

DNS Firewall supplies the rules. To apply them across a fleet you choose one of two fan-out mechanisms — they are alternatives, not layers.

Choosing the right centralization approach

Use Direct RAM sharing when you have a few accounts and want minimal overhead. Use Profiles when you need to distribute a coherent DNS configuration (rule groups + PHZs + resolver rules) at scale. Use Firewall Manager when you need org-wide compliance guarantees and auto-remediation.

Constraints:

• You SHOULD introduce a fan-out mechanism together with DNS Firewall for org-wide use rather than configuring DNS Firewall per VPC, which does not scale across a fleet
• You MUST treat Profiles and Firewall Manager as alternatives for fan-out. Using both for the same rule groups associates them to the same VPCs twice, causing duplicate rule evaluation, duplicate management, and duplicate query/association charges. If both are used, scope each to a disjoint set of VPCs
• You MUST surface that with Profiles the owner account pays for every Profile-VPC association, including associations made by RAM recipients in their own accounts
• When the customer is in a regulated industry or under a security mandate, you SHOULD surface Firewall Manager, because it provides org-wide compliance detection that customers frequently do not know exists until they have to prove compliance

Decision: RAM share permission level

Sharing a Profile through RAM grants one of two permission levels. The wrong choice either blocks the recipient or over-grants.

The default RAM managed permission for a shared Profile is association-only — it does not include route53profiles:AssociateResourceToProfile. Letting a recipient add resources into the shared Profile is not a built-in toggle; it requires creating a custom RAM managed permission that grants that action.

Constraints:

• You MUST default to the built-in association-only permission
• You MUST explain, before granting a resource-association permission, that a recipient who can associate resources into the shared Profile can add a resource (including its own private hosted zone) that then applies to every other account consuming the Profile. In an environment where the owner does not control all recipients, this lets one account inject DNS configuration into others
• Granting resource-association requires a custom RAM managed permission; the default permission cannot do it

Troubleshooting

DNS Firewall config does not scale across the fleet

It was set up per VPC instead of through a Profile. Bundle the rule groups into a Profile and fan out (procedure step 2).

Cannot prove org-wide compliance

No org-wide compliance mechanism is in place. AWS Firewall Manager centrally manages DNS Firewall rule group associations across the organization and flags non-compliant accounts (procedure step 5). Use it as an alternative to Profiles for fan-out, or scope it to VPCs that Profiles do not cover, to avoid double-association.

Recipient cannot associate, or can change shared rules

Wrong RAM permission. The built-in permission lets a recipient associate the shared Profile with its own VPCs only; adding or changing resources in the shared Profile requires a custom managed permission and exposes every consumer to that change. See the decision table above.

Procedure

Overview

This procedure applies one DNS Firewall configuration across many VPCs and accounts. It bundles DNS Firewall rule groups into a Route 53 Profile, shares the Profile cross-account through AWS Resource Access Manager (RAM) at the right permission level, associates it with VPCs in each account, and optionally adds AWS Firewall Manager for org-wide enforcement and compliance detection.

Parameters

• rule_group_ids (required): The DNS Firewall rule group IDs to centralize. Author these first with the blocking-malicious-domains-with-route53-dns-firewall skill.
• frg_priority (required): The processing priority for each rule group attached to the Profile (100-9900, lowest evaluated first). Required for DNS Firewall rule group resource associations.
• region (required): The AWS Region for the Profile and rule groups (e.g., us-east-1). The Profile, its rule groups, and every associated VPC MUST be in this same Region. For multi-Region deployments, repeat this entire procedure in each target Region — Profiles and rule groups do not replicate across Regions.
• share_principals (required for cross-account): The account IDs or AWS Organizations organizational unit (OU) ARNs to share the Profile with.
• share_permission (optional, default: read-only): read-only (built-in association-only permission) or admin (requires a custom RAM managed permission granting route53profiles:AssociateResourceToProfile; not a built-in level).
• use_firewall_manager (optional, default: false): Whether to add AWS Firewall Manager for org-wide enforcement.
• vpc_ids (required for association): The VPC IDs to associate the Profile with in each recipient account (Step 4). Each recipient account supplies its own VPC IDs; a VPC can have only one Profile associated.

Constraints for parameter acquisition:

• You MUST ask for all required parameters upfront in a single prompt
• You MUST confirm the share principals and permission level before sharing
• You MUST default share_permission to read-only and confirm explicitly before using admin

Steps

1. Verify dependencies

Constraints:

• You MUST confirm credentials with aws sts get-caller-identity

• You MUST REQUIRE provisioning credentials through ephemeral mechanisms (IAM roles via instance profiles, SSO/IAM Identity Center session credentials, or aws sts assume-role) rather than long-lived IAM user access keys.

• You SHOULD prefer least-privilege credentials for read steps and use write-capable credentials only for create, share, and associate steps

• You MUST enable Route 53 query logging to an encrypted destination where applicable, ensure CloudTrail is enabled to audit changes, and set CloudWatch alarms on health-check status where health checks are involved.

• You MUST confirm the rule groups in rule_group_ids exist:

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  aws route53resolver get-firewall-rule-group --firewall-rule-group-id {rule_group_id} --region {region}

2. Bundle the rule groups into a Profile

Constraints:

• You MUST create one Profile and attach the rule groups to it, rather than configuring DNS Firewall per VPC. Attaching a DNS Firewall rule group REQUIRES a priority via --resource-properties (allowed range 100-9900, lowest evaluated first); the call fails for a rule group without it:

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  aws route53profiles create-profile --name {profile_name} --region {region}
  aws route53profiles associate-resource-to-profile \
    --profile-id {profile_id} \
    --resource-arn {rule_group_arn} \
    --resource-properties '{"priority": {frg_priority}}' \
    --name {association_name} --region {region}

• If the same VPCs are also managed by AWS Firewall Manager, you MUST keep this priority clear of the priority ranges Firewall Manager reserves: priorities 1-99 for “first” rule groups (evaluated before account-local rules) and 9901-10000 for “last” rule groups (evaluated after account-local rules). Account-local and Profile-associated rule groups use priorities 100-9900

• You MUST enable Resolver query logging across the protected fleet so rule matches and false positives are visible org-wide. Bundle a query log config into the Profile (associate a resolverquerylogconfig resource to the Profile alongside the rule groups) so every VPC the Profile reaches logs consistently, rather than configuring logging VPC-by-VPC. You MUST encrypt the log destination at rest: a KMS key on the CloudWatch Logs log group, SSE-S3/SSE-KMS on the S3 bucket, or server-side encryption on the Data Firehose stream, because query logs reveal the domains the fleet resolves

3. Share the Profile through RAM

Constraints:

• You MUST default to a read-only RAM permission for association-only recipients

• You MUST explain the admin-sharing risk before using an admin permission (a recipient can inject configuration that applies to every consumer of the Profile)

• Create the resource share:

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  aws ram create-resource-share \
    --name {share_name} \
    --resource-arns {profile_arn} \
    --principals {share_principals} \
    --permission-arns {ram_permission_arn} \
    --region {region}

• If sharing outside the AWS Organization (or if organizational sharing is not enabled), the recipient MUST accept the resource share invitation before they can use the shared Profile:

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  aws ram get-resource-share-invitations --region {region}
  aws ram accept-resource-share-invitation \
    --resource-share-invitation-arn {invitation_arn} --region {region}

  Shares within an Organization that has RAM sharing enabled are accepted automatically

4. Associate the Profile with VPCs in each account

Constraints:

• In each recipient account, you MUST associate the shared Profile with each VPC in {vpc_ids}. A VPC can have only one Profile associated, so this fails if the VPC already has one:

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  # Repeat for each VPC in {vpc_ids}
  aws route53profiles associate-profile \
    --profile-id {profile_id} \
    --resource-id {vpc_id} \
    --name {association_name} --region {region}

• The association returns UPDATING; you MUST poll until it reaches COMPLETE before reporting success:

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  aws route53profiles get-profile-association \
    --profile-association-id {association_id} --region {region}

5. Add Firewall Manager for org-wide enforcement (optional)

Constraints:

• If use_firewall_manager is true, you MUST create a Firewall Manager DNS Firewall policy that creates and manages the rule group associations across the organization’s accounts. This is an alternative to Profile-based fan-out: you MUST NOT point Firewall Manager at the same VPCs the Profile already associates these rule groups to, or they will be associated twice

• You MUST confirm the account is a Firewall Manager administrator account before creating the policy:

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  aws fms get-admin-account --region {region}

• You SHOULD inform the customer that auto-remediation is opt-in: a Firewall Manager policy detects non-compliant accounts by default and only remediates them when configured to do so

6. Confirm and surface the console links

Constraints:

• You MUST verify the Profile associations and present the console links, filling {region} and {profileId}:

  • Profile detail:

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    https://{region}.console.aws.amazon.com/route53profiles/home?region={region}#/profiles/{profileId}

  • DNS Firewall rule groups (VPC console):

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    https://{region}.console.aws.amazon.com/vpcconsole/home?region={region}#DNSFirewallRuleGroups:

Example

Example input

Example output

Troubleshooting

DNS Firewall config does not scale across the fleet

Set up per VPC instead of through a Profile. Bundle the rule groups into a Profile and fan out (Step 2).

Recipient cannot associate the shared Profile

The RAM share is missing or the recipient was granted the wrong permission. Re-check the share principals and permission level (Step 3).

Cannot prove org-wide compliance

No org-wide compliance mechanism is in place. Use AWS Firewall Manager — as an alternative to Profiles for fan-out, or scoped to VPCs Profiles do not cover (Step 5).

Recipient can change shared rules unexpectedly

A custom resource-association permission was granted where the built-in association-only permission would do. Re-share with the built-in permission unless the recipient genuinely needs to contribute resources.

Security Considerations

• You SHOULD use least-privilege IAM credentials provisioned through ephemeral mechanisms (IAM roles, SSO/IAM Identity Center session credentials, or aws sts assume-role) rather than long-lived IAM user access keys, and prefer read-only credentials for inspection steps.
• You MUST default RAM shares to the built-in association-only permission and explain the injection risk before granting a resource-association permission, because a contributing recipient can inject configuration that applies to every consumer of the Profile.
• You MUST enable Resolver query logging fleet-wide to an encrypted destination (KMS on CloudWatch Logs, SSE-S3/SSE-KMS on S3, or server-side encryption on a Data Firehose stream) and ensure CloudTrail is enabled to audit Profile and rule group changes.
• You MUST treat Profiles and Firewall Manager as alternatives for the same rule groups to avoid double-association, duplicate evaluation, and duplicate charges.

Additional Resources

• Filter DNS traffic using Route 53 Resolver DNS Firewall (VPC User Guide) (opens in a new tab)
• Unify DNS management using Amazon Route 53 Profiles with multiple VPCs and AWS accounts (AWS News Blog) (opens in a new tab)
• Working with shared Route 53 Profiles (Route 53 Developer Guide) (opens in a new tab)

Nearby

• PreviousReference Blocking Malicious Domains
• NextReference Configuring Failover Routing