The Tool Desk
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What DNSSEC changes on an authoritative BIND server
DNSSEC adds origin authentication and integrity to DNS. A validating resolver can determine that an answer came from the authoritative zone and was not altered in transit. It does not encrypt DNS queries, hide the queried name, or replace ordinary access controls. Your authoritative server still answers normal DNS requests; it additionally publishes public signing keys, signatures and authenticated denial-of-existence records.
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When BIND signs a zone, the signed data includes:
- DNSKEY records containing the zone’s public signing keys.
- RRSIG records covering ordinary RRsets such as A, AAAA, MX and TXT.
- NSEC or NSEC3 records proving that a queried name or record type does not exist.
The parent zone publishes a DS record that authenticates one of the child’s signing keys. Without that DS, the child can be signed but is not connected to the parent chain of trust for validating resolvers.
Internet Systems Consortium states that all BIND 9 versions are DNSSEC-capable. The current operational recommendation is BIND’s Key and Signing Policy (KASP), configured with dnssec-policy, rather than hand-managed keys and scheduled signing commands.
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Choose the BIND signing model before changing the zone
Do not mix policy-managed signing with an unrelated manual-key workflow. Select one update and key-management model that matches how your zone is operated.
| Model | How it works | Best fit | Operational implications |
|---|---|---|---|
dnssec-policy default; with inline signing |
BIND keeps an unsigned source zone and a separate signed version, generating and rotating keys under KASP. | Most ordinary primary authoritative zones. | Requires a writable key-management location and enough disk space; the signed view may have a .signed file. |
| Policy-managed dynamic zone | Dynamic updates are accepted and BIND signs the updated data as part of the policy workflow. | Zones already maintained with UPDATE or an application. |
Use the dynamic update model consistently; do not edit a policy-managed zone as though it were a static manual zone. |
| Manual keys and signing commands | The operator creates keys, signs data and schedules every rollover and publication step. | Special cases requiring explicit algorithm and timing control. | Much higher risk of missed rollovers, stale signatures and operator error; the BIND documentation treats this as a special-case method. |
The examples below use the recommended automated policy and show inline signing explicitly. A dynamically updated zone can use the same policy without forcing the static-file workflow; follow the update model already used by that zone.
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Prerequisites and checks
Complete these checks on every authoritative primary and secondary before enabling signing:
- Run a supported BIND 9 authoritative installation and confirm that the running binary accepts
dnssec-policy. Although all BIND 9 versions have DNSSEC capability, policy syntax and operational behavior should match the version’s Administrator Reference Manual. - Have a writable zone-management and key-storage location. The BIND process must be able to create and later read its private key files.
- Have administrative access to the parent-zone operator, registrar or DNS service that publishes DS records.
- Confirm that every secondary server can serve DNSSEC records and understands DNSSEC-sized responses.
- Synchronize clocks with NTP or another reliable time source. Signature validity and rollover safety depend on accurate time.
- Check firewalls, load balancers and DNS proxies for EDNS0 support. DNSSEC responses are larger, and stripping EDNS0 or mishandling fragmentation can cause truncation and validation failures.
- Record the current zone serial, backup the unsigned zone and configuration, and verify that you can restore the service before making the change.
Configure an authoritative zone with the default KASP policy
In the primary server’s BIND configuration, add a zone block like this. Replace the zone name and file path with your own values.
zone "example.com" IN {
type primary;
file "db/example.com.db";
dnssec-policy default;
inline-signing yes;
};type primary; identifies this server as the authoritative primary in current BIND terminology. The file points to the unsigned source zone. dnssec-policy default; enables automated key generation, signing and rollover. inline-signing yes; tells BIND to maintain a separate signed version while leaving the source data available for normal zone management.
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The policy method requires either dynamic DNS or inline signing. If you omit both, BIND cannot apply the automated policy to a conventional static master file. Inline signing is therefore the least disruptive option for a zone currently edited as a file.
Validate the complete configuration with the checking command appropriate to your installation (for example, your normal named-checkconf and zone-file validation process) before reloading. Fix syntax, permissions and zone errors first; do not use a reload as a substitute for validation.
Define a custom policy only when the defaults are not enough
The built-in default policy is the simplest starting point because it supplies the algorithm, key roles, lifetimes, signature validity and safety timing. An explicit policy is useful when you have documented compliance, interoperability or rollover requirements, but every value becomes an operational responsibility.
An illustrative policy from the BIND DNSSEC guidance uses ECDSA P-256 with SHA-256, a 365-day KSK lifetime, a 60-day ZSK lifetime, and 600-second TTLs for DNSKEY, zone data and the parent DS. These are example values, not universal requirements. Test any custom timing against your parent publication process, secondary refresh intervals, resolver caching and incident-response capacity.
A policy must account for at least:
- The signing algorithm and whether all secondaries and parent systems support it.
- Key roles (KSK, ZSK or a combined CSK) and their lifetimes.
- DNSKEY, zone and parent-DS TTLs.
- Signature validity and refresh windows.
- Propagation delay, safety margins and how BIND detects parent DS changes.
Changing policy while a rollover is already in progress can create conflicting timing assumptions. Treat a policy change as a planned maintenance event, inspect the current key state first and follow the version-specific ARM procedure.
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Reload BIND and confirm that signing has started
- Install the zone block and any policy definition, then validate the configuration and unsigned zone file.
- Reload the configuration without stopping the server:
rndc reconfig - Review BIND’s log for policy, key-generation, permission or signing errors. A successful reload only proves that the configuration was accepted; it does not by itself prove that the parent chain is complete.
- Inspect the zone directory and key-storage location. With inline signing, BIND may create a separate signed file with a
.signedsuffix. Do not edit that generated file as if it were the source zone. - Query the authoritative server directly for DNSKEY, ordinary records with DNSSEC enabled, signatures and denial-of-existence data.
Allow time for initial key generation and signing before judging the result. The exact delay depends on the zone, server load, storage and BIND version.
Publish the DS record at the parent
After BIND has generated the active signing key, obtain the DS data (key tag, algorithm, digest type and digest) using your normal BIND inspection process. Submit that exact DS record to the parent-zone operator or registrar. The parent must publish it in the delegation for your zone.
Compare the submitted values with the active child DNSKEY before approving the change:
- The DS key tag must identify the intended child key.
- The DS algorithm and digest type must match the generated DS data.
- The digest must be copied exactly; a single changed character breaks validation.
Wait for the parent zone, secondary servers and recursive-resolver caches to converge. During this period, some resolvers may see the old delegation while others see the new DS. A child DNSKEY and RRSIG response can look correct locally while validators still report an incomplete chain.
Only after the parent DS is published and visible is the delegation fully secure to DNSSEC-validating resolvers. Keep the parent operator’s procedure and expected propagation window in your change record.
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Verify DNSSEC from the authoritative server and from outside
Check the DNSKEY RRset
dig @authoritative-server example.com DNSKEY +dnssecThe answer should contain DNSKEY records and an RRSIG covering the DNSKEY RRset. Query the server that is authoritative for the zone, not an unrelated recursive resolver, so you can distinguish signing problems from cache or delegation problems.
Check an ordinary record
dig @authoritative-server www.example.com A +dnssecFor an existing RRset, confirm that the answer includes the requested record and a corresponding RRSIG. Repeat with an AAAA, MX or TXT record if those are important to your service.
Check authenticated denial of existence
dig @authoritative-server name-that-does-not-exist.example.com A +dnssecA signed negative response should include NSEC or NSEC3 records and an RRSIG proving that the name or type is absent. The exact denial record depends on the policy and BIND configuration.
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Use an independent DNSSEC-validating resolver or a DNSSEC diagnostic such as DNSViz. Test from outside your authoritative network after the parent DS has had time to publish. Investigate any SERVFAIL, broken chain, expired signature, missing DS or DNSKEY mismatch rather than assuming that a local dig response proves end-to-end validation.
Operate key rollovers safely
ZSK rollovers
With dnssec-policy, BIND automates Zone Signing Key (ZSK) rollover. It publishes the necessary keys and signatures according to policy timing; the operator’s job is to keep the policy, clock, storage and service healthy.
KSK and CSK rollovers
Key Signing Key (KSK) and Combined Signing Key (CSK) rollovers require parent coordination because the parent DS identifies the child’s trusted key. BIND can coordinate this with configured parental-agents, or you can submit the new DS manually and acknowledge parent events.
The BIND controls for manual acknowledgement include:
rndc dnssec -checkds -key <tag> published <zone>.
rndc dnssec -checkds -key <tag> withdrawn <zone>.Use the key tag and zone generated for your deployment; the angle-bracket text above is a placeholder and must be replaced. A forced rollover is available when there is a documented reason and a safe parent procedure:
rndc dnssec -rollover -key <tag> <zone>.Do not force a rollover merely to test a command. Ensure the parent can publish the replacement DS, preserve the old trust path for the required overlap, and monitor validation throughout the change.
Protect keys, clocks and the signed zone
- Private keys: restrict filesystem ownership and permissions, include them in protected backups, and prevent untrusted users from reading or replacing them.
- Availability: missing or inaccessible key files stop BIND’s key-management process. A permanent failure can eventually allow signatures to expire, causing validating resolvers to return errors.
- Clock accuracy: monitor NTP status and alert on significant drift. A signature can appear not-yet-valid or expired when the server clock is wrong.
- EDNS0 and packet size: preserve EDNS0 through firewalls and load balancers. DNSSEC increases response size and traffic; broken fragmentation or forced truncation can prevent validation.
- Secondaries: verify that every secondary transfers and serves DNSKEY, RRSIG and NSEC/NSEC3 data. A secondary serving unsigned or stale data can create intermittent failures.
- Backups and restoration: back up the unsigned source zone, configuration, policy and private keys together. A restored zone without its key state may trigger unexpected management or rollover behavior.
- Monitoring: alert on signing errors, key-state changes, missing DS, validation failures and approaching signature expiry rather than waiting for user reports.
Common failures and how to isolate them
| Symptom | Likely cause | Checks and corrective action |
|---|---|---|
| DNSKEY is absent from the authoritative answer | Policy was not applied, signing has not completed, or BIND cannot write its key/signed-zone files. | Read BIND logs, verify the zone has dnssec-policy and dynamic or inline signing, check directory permissions and inspect the generated files. |
| Ordinary records have no RRSIG | The query reached an unsigned secondary or the signed view is not being served. | Query each authoritative server directly, confirm transfer and DNSSEC support on secondaries, and inspect the inline signed-zone state. |
| Validators return SERVFAIL after DS publication | DS does not match the active DNSKEY, signatures are invalid, the parent is only partly converged, or responses are truncated. | Compare DS key tag, algorithm and digest with the child DNSKEY; test from multiple networks; check clocks, signature times, EDNS0 and parent publication. |
| Negative answers fail validation | NSEC/NSEC3 data is missing, stale or inconsistent between authoritative servers. | Query a nonexistent name with +dnssec against every authoritative server and repair transfer or signing state. |
| Rollover stops or signatures approach expiry | Private key files are missing, unreadable or on unavailable storage; a policy change may also conflict with an active rollover. | Restore accessible key files from a protected backup, correct ownership and permissions, inspect key state, and follow the version-specific recovery procedure before changing policy. |
| Only some networks see failures | Cache and propagation differences, a stale secondary, or a path that mishandles large EDNS0 responses. | Compare parent and child answers from several vantage points, check all secondaries and remove DNS proxies or firewall rules that strip EDNS0. |
Automation versus manual management: a practical decision
For a normal authoritative zone, use KASP with dnssec-policy and inline signing (or the existing dynamic-update model). This minimizes recurring operator work and automates ZSK rollover. Choose manual keys only when a documented requirement demands that level of control and you can staff continuous monitoring, parent coordination, signature timing and recovery.
| Decision axis | Automated KASP | Manual management |
|---|---|---|
| Automation level | Key generation, signing and ZSK rollover are policy-driven. | Operator creates keys, signs data and schedules rollovers. |
| Zone updates | Dynamic DNS or inline signing is required. | Can be tailored to a controlled offline or bespoke workflow. |
| Parent coordination | DS submission remains necessary for KSK/CSK; parental agents can automate detection. | Every trust-anchor and rollover event is handled manually. |
| Algorithm and timing control | Set through a named policy, with defaults available. | Maximum explicit control, with corresponding responsibility. |
| Operational risk | Lower routine effort, provided keys, clocks, storage and secondaries remain healthy. | Higher risk of missed publication, stale signatures and expired keys. |
Deployment checklist
- Back up the unsigned zone, configuration, policy and private keys.
- Verify NTP, writable storage, DNSSEC-capable secondaries and EDNS0 across the network path.
- Add
dnssec-policy default;and, for a static source file,inline-signing yes;. - Validate configuration and zone syntax, then run
rndc reconfig. - Confirm DNSKEY, RRSIG and NSEC/NSEC3 responses directly from each authoritative server.
- Extract the active DS data and submit it to the parent operator.
- After parent publication and cache convergence, test with an independent validating resolver.
- Monitor key files, rollover state, signature expiry, parent DS status and validation errors continuously.
The Bottom Line
For most BIND 9 authoritative zones, the safe path is automated KASP: configure dnssec-policy default; with inline signing or dynamic updates, reload with rndc reconfig, verify DNSKEY/RRSIG/NSEC data, and publish the matching DS at the parent. Keep private keys available, clocks accurate, EDNS0 intact and secondaries synchronized; DNSSEC is complete only when external validators can follow the parent-to-child chain.
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