You cannot safely migrate by copying a resolver address and assuming every setting follows it. Treat the change as a policy and deployment migration: inventory each NextDNS configuration, recreate its behavior in Control D Profiles, move domain exceptions and rewrites deliberately, assign Profiles to the correct Endpoints, then pilot and validate the new resolver before widening the cutover. Keep the existing NextDNS details ready so you can roll back quickly.
What “without losing your DNS settings” really means
A DNS provider switch changes more than the address your devices query. NextDNS configurations can contain security and privacy controls, service blocks, allowlists, denylists, rewrites, logging choices, linked-IP settings and different assignments for homes, offices, users or devices. Control D does not automatically import those configurations. The official migration guidance describes the work as a concept-mapping exercise: identify the intent and scope of each old setting, then recreate it with the closest Control D feature.
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Preservation therefore means preserving the intended behavior, not producing an identical export file. Filter categories, third-party lists and service definitions may classify domains differently, so important applications and domains must be tested after mapping.
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Inventory NextDNS before changing any resolver
Create a written record for every NextDNS configuration, including configurations that appear nearly identical. This inventory is your migration plan and your rollback record.
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| Item to record | Why it matters in Control D |
|---|---|
| Configuration or profile ID | Identifies the old policy when several configurations exist and is needed if you use a staged ctrld bridge. |
| Assigned devices, routers, networks, users and offices | Determines which Control D Endpoint should enforce the replacement Profile. |
| Security settings and threat lists | These usually map to Control D Filters, but the matching list may not produce identical results. |
| Privacy, advertising and tracker lists | Record each enabled list and its intended scope so you can select comparable Filters and test false positives. |
| Parental controls, content categories and named service blocks | Some behavior belongs in Filters; a named application or service may be better represented by a Control D Service. |
| Allowlist and denylist entries | These become explicit BYPASS or BLOCK Custom Rules after the entries are cleaned to DNS names. |
| Rewrites and local DNS records | Public overrides and private names may need different resolver paths and should not be blindly combined. |
| Linked IP and Dynamic DNS settings | These affect how a network is identified when it does not have a stable public address. |
| Logging level and retention preferences | Useful for matching privacy expectations and for ensuring that troubleshooting data is available during the pilot. |
| Deployment method | Record router, DHCP, operating-system, browser, mobile, MDM, VPN and client settings that currently send traffic to NextDNS. |
Save the current NextDNS resolver hostnames, profile IDs, linked-IP details and client configuration files. Do not remove them until the Control D deployment has operated correctly for several days and you have a tested rollback procedure.
Design the Control D Profile structure
In Control D, a Profile contains policy, but it only affects traffic when that Profile is enforced on an Endpoint. Create one Profile for each NextDNS configuration that has materially different behavior. A family profile, an employee profile and a server-network profile should not be collapsed merely because they share a few filters.
When to create separate Profiles
- Create separate Profiles when users or devices need different blocked categories, exceptions, rewrites or service access.
- Keep a single Profile when the old configurations were genuinely identical and only differed by a label or assignment.
- If several configurations share a common baseline, use one shared baseline Profile and add profile-specific Custom Rules only where the behavior diverges. Test that the resulting inheritance and assignments are clear to the people who will maintain them.
Name Profiles after their purpose and scope, such as “Home—standard,” “Home—children” or “Office—staff.” Avoid names that contain only an old NextDNS ID; an operator should be able to identify the intended users and controls from the dashboard.
Map filters, services and custom rules
Broad controls: Filters
Use Control D Filters for broad security, privacy, advertising, tracker and content controls. Select the closest available lists to the intent recorded in your inventory. A filter with a similar name is not proof of identical coverage: list contents, category boundaries and update schedules can differ. For each high-value workflow, test both the expected block and legitimate domains that must remain reachable.
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Named applications: Services
When the policy concerns a named application or service rather than a general class of domains, check whether a matching Control D Service exists. Service definitions can cover a set of domains that would be cumbersome to maintain as individual rules. Confirm the application on real devices because the domains it uses can vary by region, platform and sign-in state.
Specific domains: Custom Rules
Use Custom Rules for exceptions and one-off decisions. An allow entry from NextDNS generally becomes a BYPASS rule, while a deny entry becomes a BLOCK rule. Keep these rule groups separate and give them descriptive names so a later administrator can tell why an exception exists.
Clean allowlists and denylists before importing them
Export or copy each NextDNS list, then normalize it to one domain per line. Remove protocols such as https://, URL paths, query strings, quotes, inline comments, blank lines and duplicates. Check that every remaining value is a domain or subdomain.
DNS rules operate on DNS names, not complete web URLs. A rule cannot preserve behavior that depends on a path such as /account, a query parameter or another HTTP-layer condition. Put those entries into a review list rather than importing them as if they were equivalent DNS rules. Decide whether the requirement can be expressed as a domain rule or must be handled by an application, browser or web-security control.
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Resolve conflicts deliberately
Compare the old lists for overlaps: a domain present in both allow and deny lists, a parent domain that covers a more specific exception, or a filter that blocks a name later allowed by a custom rule. Record the intended outcome and verify it in the pilot. Do not assume that copying entries in the same order will reproduce the old precedence.
Handle rewrites and private DNS separately
Divide every NextDNS rewrite into two categories before recreating it:
- Public-domain overrides: a deliberate answer change for a public name. Recreate it only when the Control D rule target and the resolver path are appropriate.
- Private or internal names: records for a home lab, office service, Active Directory domain, printer or other internal resource. These may need local DNS forwarding, router DNS, split-horizon DNS, Active Directory integration or a
ctrldcustom configuration.
A private name that worked through an internal resolver can fail if all queries are sent directly to a public policy resolver. Test internal names from inside the network and from roaming devices; the correct answer may differ by location. Document which resolver is authoritative for each private zone and which clients are supposed to reach it.
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Match the deployment method to the network
Routers and firewalls
Create a Control D Endpoint representing the network, then apply the intended Profile and deploy the resolver settings or ctrld on the router or firewall. Check DHCP-provided DNS addresses, IPv6 DNS settings and any device-specific overrides. A router can appear migrated while clients continue using an older resolver supplied by DHCP or hard-coded on the device.
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Roaming computers and phones
Use Endpoints with the appropriate operating-system profile, MDM configuration, browser setting or ctrld client. Verify behavior both on the home network and on an unrelated Wi-Fi or cellular connection. Mobile Private DNS, browser DNS-over-HTTPS (DoH), VPN clients and security software can bypass the resolver you changed at the operating-system level.
Legacy source-IP authorization
Source-IP authorization is practical only when the authorized public IP can be kept current reliably. Dynamic networks should use encrypted DNS or a heartbeat/Dynamic DNS workflow recommended for that situation rather than depending on a stale address. Confirm that the Endpoint identity shown in Control D corresponds to the intended network or client.
Use a staged ctrld bridge when it reduces risk
The official migration guidance supports a NextDNS Mode in ctrld version 1.3.2 or newer. In this mode, the local daemon and deployment can be validated while forwarding to a selected NextDNS profile. You can then change the upstream to Control D after confirming that the listener, router installation and client metadata are correct.
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ctrld start --nextdns NEXTDNS_PROFILE_IDReplace NEXTDNS_PROFILE_ID with the actual NextDNS profile identifier. The generated configuration is usually at /etc/controld/ctrld.toml, although the path varies by platform. Confirm the installed ctrld version and platform-specific service instructions before applying the command. A bridge is optional; it is a validation technique, not a requirement for every migration.
Run a controlled pilot before changing everyone
Use one Endpoint or a small, representative user group first. Include at least one device that uses the most important business, school, family or customer workflow and, if relevant, a device that must resolve private names.
- Build the destination Profile. Recreate filters, services, custom rules, rewrites and logging choices from the inventory. Give the Profile a clear scope-oriented name.
- Create or verify the Endpoint. Associate the correct network, router or client with the Profile. Confirm that the Endpoint is the identity you expect to see in Control D.
- Change only the pilot resolver path. Update the selected router, DHCP scope, operating-system profile, browser, MDM policy or
ctrldinstance. Leave other users on NextDNS. - Confirm enforcement. Check the dashboard to ensure the intended Profile is actually applied. An unassigned Profile cannot protect traffic.
- Test positive and negative cases. Visit critical services, verify that required allow rules work, confirm that selected blocks still block, and test applications rather than only web pages.
- Test private names and location changes. Resolve internal records on the local network, then test a roaming device away from it if that use case exists.
- Inspect Activity Log results. Confirm query actions, blocks, bypasses and Endpoint names. Control D’s Activity Log documentation states that the Full Analytics log level is required for DNS queries to appear there.
- Record discrepancies. For every failure, capture the device, network, queried name, selected Profile, action shown in Activity Log and the resolver path actually used. Correct the mapping before expanding the pilot.
- Expand in stages. Move the next network or user group only after the pilot remains clean through the workflows that matter to that group.
Validation checklist
- Every distinct NextDNS configuration has a documented Control D Profile or an explicitly approved consolidation.
- Every device, router, network and user is assigned to the intended Endpoint and Profile.
- Allow entries were converted to domain-only
BYPASSrules and deny entries to domain-onlyBLOCKrules. - URL paths and query-string rules were reviewed instead of blindly imported.
- Public rewrites and private/internal DNS records were handled through the correct resolver path.
- Router DHCP, IPv6, browser DoH, mobile Private DNS, VPN and MDM settings do not bypass the new policy.
- Critical applications, authentication flows, updates, content controls and internal services work as expected.
- Activity Log visibility is enabled at Full Analytics for the troubleshooting period.
- The previous NextDNS resolver settings, IDs and deployment files are stored where the operator can restore them quickly.
Common migration failures and fixes
| Symptom | Likely cause | What to check |
|---|---|---|
| Queries appear under the wrong policy | The Endpoint is assigned to the wrong Profile, or traffic is arriving through another resolver. | Check Endpoint assignment, DHCP and IPv6 DNS, browser DoH, VPN software and the resolver address reported by the client. |
| An allowed site remains blocked | The allow entry was copied with a URL path, the relevant parent domain was omitted, or a different filter/service still blocks it. | Reduce the rule to the required domain or subdomain, inspect Activity Log, and identify the blocking filter or service before adding an exception. |
| A denied service still works | The service uses additional domains, a different platform endpoint or a bypassing client. | Review all queries generated by the application, confirm the Service or BLOCK rule scope, and check for DoH or VPN bypass. |
| Internal hostnames stop resolving | A private rewrite was treated as a public rule, or clients no longer reach the internal resolver. | Restore the local DNS, split-horizon, Active Directory or router-forwarding path and test from each network location. |
| Nothing appears in Activity Log | Logging is not set to Full Analytics, or the device is not using the Control D Endpoint. | Enable Full Analytics for the pilot and verify the actual resolver path and Endpoint identity. |
| Only roaming devices fail | The mobile or laptop profile is missing, or Private DNS, DoH or a VPN takes precedence. | Inspect client-level DNS settings on both cellular and Wi-Fi connections and apply the correct Endpoint configuration. |
| A dynamic network loses authorization | Source-IP authorization became stale after the public address changed. | Use encrypted DNS or the supported heartbeat/Dynamic DNS approach and confirm that the Endpoint updates. |
How to compare an old setting with a new one
When no exact feature match exists, evaluate the mapping on five axes rather than comparing labels alone:
| Axis | Question to answer |
|---|---|
| Policy intent | Is this a broad security, privacy or content decision; a named service; or one specific domain exception? |
| Scope | Which old configuration, users, devices or networks received it, and which new Profile and Endpoint should receive it? |
| DNS semantics | Is the behavior domain-based, or did it depend on a URL path, query string, public override or private name? |
| Deployment and identity | Does the traffic come from a router, roaming Endpoint, browser DoH, mobile Private DNS or ctrld client metadata? |
| Verification and rollback | Can you see the expected action and Endpoint in Activity Log, and can you restore the former resolver quickly? |
This framework prevents a common mistake: selecting a similarly named filter while ignoring that it applies to a different scope or resolver path.
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Keep rollback available until the migration is proven
Record every change made during cutover, including router and DHCP values, MDM profiles, browser settings, operating-system DNS values, VPN exceptions, linked-IP settings and ctrld service changes. If the pilot exposes a serious problem, rollback normally means restoring the previous NextDNS resolver or restarting the previous client configuration. When ctrld is being used as a bridge, point it back to the recorded NextDNS profile while you correct the Control D Profile or Endpoint.
Do not delete the old configuration immediately after a successful first test. Leave the rollback materials available until the migrated group has completed normal work, updates, sign-ins and location changes for several days. Then archive the records and remove obsolete assignments in a controlled maintenance window.
Final operating practice
After the cutover, treat Control D Profiles and Endpoints as configuration-managed infrastructure. Keep a change log for new exceptions, review why each BYPASS rule exists, and test private DNS after router or VPN changes. When a filter update changes application behavior, Activity Log evidence should identify whether the cause is a filter, service, custom rule or resolver-path problem. This discipline preserves the intent of the former NextDNS setup without pretending that two providers have identical categories or lists.
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