Re: [dhcwg] Renumbering DNS with stateless DHCPv6

Tim Chown wrote:

>>Both setting the trigger of re-request on renumbering of prefix in RA,
>>and a multicast Reconfigure message might cause all nodes to rush on
>>the single DHCPv6-lite server for information-request reply exchange.
>>It could work with small number of clients though.
>>    
>>
>
>I guess you could add some random delays, but you should also scale your
>DHCPv6 server provision to have multiple servers?
>
>I guess we can say that:
>
>(1) Automatic renumbering is broken if people hard-code data in clients
>
>(2) If a secure environment for reconfigure is needed, a multicast message
>    adds some complexity
>
>(3) The Reconfigure message is really designed for a fully stateful DHCPv6
>    environment, not a purely stateless one providing options info (?)
>
>(4) Periodic polling of the DHCPv6 server by clients allows renumbering
>    but is not a full solution for more rapid (unplanned) renumbering.
>  
>
Though, rapid renumbering is not more likely to happen, periodic polling 
will take some network bandwidth,

>(5) There isn't really a ethod now for a client to be informed of a
>    renumbering event of a stateless DHCPv6 option (DNS, NTP)
>
>(6) We don't want to use RA method because that would also mean an NTP
>    extension for RA (?)
>
>(7) If the network renumbers, statelessly configuring hosts should/could
>    use the new prefix seen on an RA as a hint to re-request DHCPv6
>    options if the O bit is set.
>
>So is something overlooked, or do we not feel we need a solution to (5),
>given we could use (7)?   Not sure how explicit (7) is...
>  
>

I guess, (7) is better than inventing a solution for (5)... The client 
can assume the prefix change mean, there is a very good chance that some 
of the configuration information may have changed and it can go ahead 
and initiate re-request in the case O bit is set in RAs..

Vijay

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Re: [dhcwg] Renumbering DNS with stateless DHCPv6 - bug?