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IPv6 Router Advertisement based DNS Autoconfiguration

IPv6 Router Advertisement based DNS Autoconfiguration. draft-jeong-ipv6-ra-dns-autoconf-00.txt. Jaehoon Paul Jeong ETRI paul@etri.re.kr http://www.adhoc.6ants.net/~paul/ 14 th July 2003 57th IETF – Vienna, Austria. Motivation of the Draft. DNS Discovery through Neighbor Discovery

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IPv6 Router Advertisement based DNS Autoconfiguration

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  1. IPv6 Router Advertisement basedDNS Autoconfiguration draft-jeong-ipv6-ra-dns-autoconf-00.txt Jaehoon Paul Jeong ETRI paul@etri.re.kr http://www.adhoc.6ants.net/~paul/ 14th July 2003 57th IETF – Vienna, Austria IETF57 DNSOP WG

  2. Motivation of the Draft • DNS Discovery through Neighbor Discovery • If both IPv6 Address and DNS Information can be autoconfigured simultaneously, the additional delay for finding out DNS Information can be saved. • Using DHCPv6 requires some delay for • Discovery of DHCPv6 Server • Message exchanges between the IPv6 Host and DHCPv6 Server. • Especially, the time for DNS discovery in Wireless Networks is important, • Such as MIPv6, HMIPv6, NEMO and MANET. • We need a simple DNS Autoconfiguration mech. • DNS Discovery for DNS Name Resolution • Auto-Registration of Host DNS Name IETF57 DNSOP WG

  3. Idea of the Draft 1. RA-based DNS Discovery • Autoconfiguration of Recursive DNS Server (RDNSS) • RA message announces DNS Information to IPv6 hosts. • An IPv6 host can configure the address of RDNSS(es) placed in the local or visited network. • Optimization of DNS Name Resolution • is possible by using the local RDNSS placed in the same network. 2. Auto-Registration of Host DNS Name • A User-preferred Host DNS Name, including the DNS zone suffix of the local or visited network, can be registered with DNS server through DNS Dynamic Update. IETF57 DNSOP WG

  4. DNS Option format 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Type | Length | Pref |A| Reserved | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Reserved | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | | + + | | + IPv6 Address of DNS Server + | | + + | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | | ~ DNS Zone Suffix ~ | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ IETF57 DNSOP WG

  5. Procedure of DNS Autoconfiguration IPv6 Host Router DNS Server (RS) RA w/ DNS option DAD NS 1. DNS Discovery 2. DNS Name Auto-Registration no NA DNS Request for checking DNS Name duplication DNS Response DNS Request for registering AAAA resource record DNS Response IETF57 DNSOP WG

  6. RA-based DNS Discovery 1. Discovery of Recursive DNS Server (RDNSS) • For DNS Name Resolution • IPv6 Host can select the nearest RDNSS • On the basis of “Pref” field in DNS Option and the longest prefix matching between the RDNSS’s and Host’s IPv6 addresses. 2. Discovery of DNS Zone Suffix • For DNS Name Auto-Registration IETF57 DNSOP WG

  7. DNS Server (DNSS) Web Server(WS) RDNSS : Recursive DNS Server 3 Internet Home Agent(HA) Mobility Anchor Point(MAP) 5 2 1 RDNSS1 RDNSS2 4 MN Home Network Foreign Network Application of DNS Autoconfiguration: Optimization of DNS Name Resolution in HMIPv6<draft-jeong-hmipv6-dns-optimization-01.txt> IETF57 DNSOP WG

  8. Host DNS Name Auto-Registration 1. Generation of DNS Name • Combination of User-preferred ID and DNS Zone Suffix • User-preferred ID • E.g. Paul, Paul-1, Paul-2, etc. • DNS Zone Suffix • is provided by DNS Option in RA message. 2. Verification of the Uniqueness of DNS Name • Duplicate Name Detection through DNS Dynamic Update 3. Host-initiated Registration of DNS Name • IPv6 Host can register its DNS name and IPv6 address through DNS Dynamic Update by itself. IETF57 DNSOP WG

  9. Considerations for DNS Dynamic Update • Allowance of Auto-Registration from an unidentified IPv6 host • Through AR-bit (Auto-Registration) in Header Section • We can limit the kinds of dynamic update operations • Allowance of adding a new AAAA resource record • Allowance of modifying its own AAAA resource record • Denial of deleting other hosts’ AAAA resource records IETF57 DNSOP WG

  10. Header Section format inDNS Dynamic Update 0 1 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ | ID | +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ |QR| Opcode |AR| Reserved | RCODE | +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ | ZOCOUNT | +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ | PRCOUNT | +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ | UPCOUNT | +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ | ADCOUNT | +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ AR-bit : Auto-Registration IETF57 DNSOP WG

  11. Discussion • This draft can be divided into two separate drafts. • RA-based DNS Discovery • Extension to DNS Dynamic Update for Host DNS Name Auto-Registration • How about dnsop wg draft? • In order to discuss DNS Autoconfiguration including DNS Discovery. • Any questions or comments… IETF57 DNSOP WG

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