DNS Discovery Discussion Report

Draft-ietf-ipngwg-dns-discovery-01.txt

The Problem

• Enable name resolution in the absence of a DHCP server (e.g., ad hoc network)

• May use DNS (if server) or mDNS (if not)

• Must be able to determine, if node desires:– 1 or more addresses of DNS servers (if any)– Own domain name– Domain search path

Team Goal

• Provide analyses of the many possible ways to discover the info needed

• Provide a recommendation as input to the IPNG WG

Previous Status

• In San Diego, team recommended using site-scoped anycast as the transport mechanism for messages– Also got IPNG WG consensus

• Presented analysis, but not a recommendation, of payload formats– Team continued to discuss payload formats

Current Status

• Updated I-D to include anycast recommendation

• Team’s last meeting included Olafur Gudmundsson (dnsext WG chair)

• Team achieved rough consensus on a payload format

• Ready to provide rest of recommendation…

Recommendation

• Use DNS SRV record lookups as payload– Can be done in 1 message exchange– Can be done without changing DNS Servers– Can be done without any DNSEXT WG work

• Use “Other stateful configuration” bit in RA’s to disable this

Proposed Next Steps

• Update Analysis draft with payload recommendation, and revise DNS section– Eventually publish as Informational

• Start work on a new standards track I-D describing details of actual mechanism– E.g. how to express the desired information in

SRV records