[dnssd] WGLC on draft-ietf-dnssd-hybrid-03

Tim Chown <tjc@ecs.soton.ac.uk> Thu, 17 March 2016 22:37 UTC

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Subject: [dnssd] WGLC on draft-ietf-dnssd-hybrid-03
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Dear dnssd WG participants,

We are initiating a WG Last Call today on draft-ietf-dnssd-hybrid-03, as can be found at https://tools.ietf.org/html/draft-ietf-dnssd-hybrid-03 <https://tools.ietf.org/html/draft-ietf-dnssd-hybrid-03>.

The call runs for two weeks, and will thus close on Thursday 31st March.

Please send any comments (including indications of support for progression of the document as is) to the dnssd@ietf.org list. This draft will not be advanced for publication unless there is sufficient response and support from the WG.  And, of course, any substantive comments on the draft are strongly encouraged as well. We are aware of a small number of minor outstanding comments from the list, but will consider these as part of the WGLC process.

We will discuss the comments arising from the WGLC in the WG meeting in BA on Monday 4th April.


   Performing DNS-Based Service Discovery using purely link-local
   Multicast DNS enables discovery of services that are on the local
   link, but not (without some kind of proxy or similar special support)
   discovery of services that are outside the local link.  Using a very
   large local link with thousands of hosts facilitates service
   discovery, but at the cost of large amounts of multicast traffic.

   Performing DNS-Based Service Discovery using purely Unicast DNS is
   more efficient and doesn't require excessively large multicast
   domains, but requires that the relevant data be available in the
   Unicast DNS namespace.  This can be achieved by manual DNS
   configuration (as has been done for many years at IETF meetings to
   advertise the IETF Terminal Room printer) but this is labor
   intensive, error prone, and requires a reasonable degree of DNS
   expertise.  The Unicast DNS namespace can be populated with the
   required data automatically by the devices themselves, but that
   requires configuration of DNS Update keys on the devices offering the
   services, which has proven onerous and impractical for simple devices
   like printers and network cameras.

   Hence, to facilitate efficient and reliable DNS-Based Service
   Discovery, a compromise is needed that combines the ease-of-use of
   Multicast DNS with the efficiency and scalability of Unicast DNS.


Ralph and Tim
dnssd WG co-chairs