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RE: Proposed IPv6 DNS Discovery Requirements




  > Server location via anycast means that one is using the 
  > routing system
  > to keep track of the location of the DNS server.  That is, the
  > location of the DNS server is (somehow) injected into the routing
  > system, and the routing system is now responsible for 
  > handing out that
  > information to any client that wants to know.  If the server goes
  > down, moves, whatever, the DNS server becomes unreachable until the
  > routing system converges on a new useful answer,

=> Correct. This is the case for all traffic going 
through a certain 'path' in a network.

 and how 
  > exactly does
  > the routing system know that the DNS server is gone, 
  > anyway?  Does the
  > DNS server now have to speak OSPFv3, or is there some human 
  > sitting at
  > a 24x7 desk somewhere waiting to push a button on failure, or what?

=> There were several mechanisms shown in the analysis
draft to allow this to happen without a human
monitoring the wire.

1. The DNS can inject a route. Do you see problems
   with this?

2. Using Neighbour discovery and periodic solicitations.
   Most people in the DT didn't like this option.

3. The cleanest way: extensions to MLD to allow a node
   to join an anycast group.

Hesham
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