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104 lines
3.6 KiB
Text
104 lines
3.6 KiB
Text
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Unbound Features
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(C) Copyright 2008, Wouter Wijngaards, NLnet Labs.
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This document describes the features and RFCs that unbound
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adheres to, and which ones are decided to be out of scope.
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Big Features
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------------
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Recursive service.
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Caching service.
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Forwarding and stub zones.
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Very limited authoritative service.
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DNSSEC Validation options.
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EDNS0, NSEC3, IPv6, DNAME, Unknown-RR-types.
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RSASHA256, GOST, ECDSA, SHA384 DNSSEC algorithms.
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Details
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-------
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Processing support
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RFC 1034-1035: as a recursive, caching server. Not authoritative.
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including CNAMEs, referrals, wildcards, classes, ...
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AAAA type, and IP6 dual stack support.
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type ANY queries are supported, class ANY queries are supported.
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RFC 1123, 6.1 Requirements for DNS of internet hosts.
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RFC 4033-4035: as a validating caching server (unbound daemon).
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as a validating stub (libunbound).
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RFC 1918.
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RFC 1995, 1996, 2136: not authoritative, so no AXFR, IXFR, NOTIFY or
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dynamic update services are appropriate.
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RFC 2181: completely, including the trust model, keeping rrsets together.
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RFC 2308: TTL directive, and the rest of the RFC too.
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RFC 2671: EDNS0 support, default advertisement 4Kb size.
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RFC 2672: DNAME support.
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RFC 3597: Unknown RR type support.
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RFC 4343: case insensitive handling of domain names.
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RFC 4509: SHA256 DS hash.
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RFC 4592: wildcards.
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RFC 4697: No DNS Resolution Misbehavior.
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RFC 5011: update of trust anchors with timers.
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RFC 5155: NSEC3, NSEC3PARAM types
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RFC 5358: reflectors-are-evil: access control list for recursive
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service. In fact for all DNS service so cache snooping is halted.
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RFC 5452: forgery resilience. all recommendations followed.
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RFC 5702: RSASHA256 signature algorithm.
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RFC 5933: GOST signature algorithm.
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RFC 6303: default local zones.
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It is possible to block zones or return an address for localhost.
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This is a very limited authoritative service. Defaults as in draft.
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RFC 6604: xNAME RCODE and status bits.
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RFC 6605: ECDSA signature algorithm, SHA384 DS hash.
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chroot and drop-root-privileges support, default enabled in config file.
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AD bit in query can be used to request AD bit in response (w/o using DO bit).
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CD bit in query can be used to request bogus data.
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UDP and TCP service is provided downstream.
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UDP and TCP are used to request from upstream servers.
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SSL wrapped TCP service can be used upstream and provided downstream.
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Multiple queries can be made over a TCP stream.
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No TSIG support at this time.
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No SIG0 support at this time.
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No dTLS support at this time.
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This is not a DNS statistics package, but some operationally useful
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values are provided via unbound-control stats.
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TXT RRs from the Chaos class (id.server, hostname.bind, ...) are supported.
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draft-0x20: implemented, use caps-for-id option to enable use.
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Also implements bitwise echo of the query to support downstream 0x20.
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draft-ietf-dnsop-resolver-priming(-00): can prime and can fallback to
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a safety belt list.
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draft-ietf-dnsop-dnssec-trust-anchor(-01): DS records can be configured
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as trust anchors. Also DNSKEYs are allowed, by the way.
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draft-ietf-dnsext-dnssec-bis-updates: supported.
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Record type syntax support, extensive, from lib ldns.
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For these types only syntax and parsing support is needed.
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RFC 1034-1035: basic RR types.
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RFC 1183: RP, AFSDB, X25, ISDN, RT
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RFC 1706: NSAP
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RFC 2535: KEY, SIG, NXT: treated as unknown data, syntax is parsed (obsolete).
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2163: PX
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AAAA type
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1876: LOC type
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2782: SRV type
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2915: NAPTR type.
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2230: KX type.
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2538: CERT type.
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2672: DNAME type.
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OPT type
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3123: APL
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3596: AAAA
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SSHFP type
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4025: IPSECKEY
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4033-4035: DS, RRSIG, NSEC, DNSKEY
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4701: DHCID
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5155: NSEC3, NSEC3PARAM
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4408: SPF
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6944: DNSKEY algorithm status
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