On Mon, 08 Aug 2016 10:49:17 -0700, =?utf-8?Q?=F0=9F=94=93Dan_Wing?= wrote: 
>Are there documented procedures for how a DPRIVE client handles joining a 
>network with a captive portal, or other filtering, which prevents accessing 
>the DPRIVE DNS server?

Yes.  From RFC-7858 section 4.2:

   However, a configured DNS server may be temporarily unavailable when
   configuring a network.  For example, for clients on networks that
   require authentication through web-based login, such authentication
   may rely on DNS interception and spoofing.  Techniques such as those
   used by DNSSEC-trigger [DNSSEC-TRIGGER] MAY be used during network
   configuration, with the intent to transition to the designated DNS
   provider after authentication.  The user MUST be alerted whenever
   possible that the DNS is not private during such bootstrap.

   -John Heidemann

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