RRSIG Lookup
Query RRSIG records to verify DNSSEC signatures and validation status
This page provides original, human-reviewed information about RRSIG record lookups, explaining signature inception and expiration, key tags, and how expired RRSIG records break DNSSEC validation.
RRSIG (Resource Record Signature) records are cryptographic signatures used in DNSSEC (DNS Security Extensions) to authenticate DNS data. They provide integrity and authenticity verification for DNS responses, protecting against DNS spoofing and cache poisoning attacks.
Key Components:
- Type Covered:The DNS record type that this signature covers (A, MX, NS, etc.)
- Algorithm:The cryptographic algorithm used for signing (RSA/SHA-256, ECDSA, etc.)
- Signature Expiration:When the signature expires and needs renewal
- Key Tag:Identifier for the DNSKEY used to create this signature
- Signature:The actual cryptographic signature data
How RRSIG Records Work:
- DNS zone owner creates DNSKEY records containing public keys
- Private keys are used to sign DNS records, creating RRSIG records
- Resolvers verify signatures using the corresponding DNSKEY records
- Chain of trust is established through DS records in parent zones
Basic DNSSEC Setup Process:
1. Generate DNSSEC Keys
2. Sign the Zone
3. Submit DS Record to Parent
Popular DNSSEC Tools:
BIND (named)
Built-in DNSSEC support with auto-signing capabilities
PowerDNS
Automated DNSSEC signing and key management
Knot DNS
High-performance authoritative DNS server with DNSSEC
Expired Signatures
RRSIG records have expiration dates. Expired signatures cause DNSSEC validation failures.
Solution: Implement automated signature renewal and monitoring.
Missing RRSIG Records
Some record types are signed while others are not, causing inconsistent DNSSEC validation.
Solution: Ensure all record types in the zone are properly signed.
Key Rollover Issues
Improper key rollover procedures can break the chain of trust.
Solution: Follow RFC 6781 key rollover procedures carefully.
Algorithm Mismatch
Using deprecated or unsupported cryptographic algorithms.
Solution: Use modern algorithms like RSA/SHA-256 or ECDSA.
Clock Synchronization
Signature validation depends on accurate time. Clock drift can cause validation failures.
Solution: Ensure all DNS servers have synchronized clocks (NTP).
How often should RRSIG records be renewed?
RRSIG records typically have a validity period of 30 days, but should be renewed weeklyto provide a safety margin. Automated renewal is strongly recommended.
What happens if RRSIG validation fails?
When DNSSEC validation fails, resolvers that enforce DNSSEC will return SERVFAIL,making the domain inaccessible to users. Non-validating resolvers may still return results.
Can I have DNSSEC without all record types signed?
No, for proper DNSSEC operation, all record types in a signed zone must have correspondingRRSIG records. Partial signing can lead to validation failures.
How do I verify my DNSSEC setup is working?
Use tools like 'dig +dnssec' or online DNSSEC validators. Look for RRSIG records inresponses and verify the chain of trust from root to your domain.
What's the difference between ZSK and KSK?
Zone Signing Keys (ZSK) sign zone data and create RRSIG records. Key Signing Keys (KSK)sign the DNSKEY records and are used to create DS records in the parent zone.
Should I use RSA or ECDSA for DNSSEC?
Both are secure when properly implemented. ECDSA offers smaller key sizes and signatures,while RSA has broader compatibility. RSA/SHA-256 and ECDSA P-256 are both recommended.
Related Tools
Need Help?
Our tools are designed to be intuitive, but if you need assistance, we're here to help.
About Our Tools
Professional-grade email and DNS diagnostic tools trusted by IT professionals worldwide.