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

2. 2IETF57 DNSOP WG 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

3. 3IETF57 DNSOP WG 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.

4. 4IETF57 DNSOP WG 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 ~ | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

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

6. 6IETF57 DNSOP WG 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

7. 7IETF57 DNSOP WG Application of DNS Autoconfiguration : Optimization of DNS Name Resolution in HMIPv6

8. 8IETF57 DNSOP WG 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.

9. 9IETF57 DNSOP WG 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

10. 10IETF57 DNSOP WG Header Section format in DNS 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

11. 11IETF57 DNSOP WG 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…