Re: [nbs] Name->Locator validation. (Was: Re: A suggestion for an "on-demand API".)

Brian E Carpenter <brian.e.carpenter@gmail.com> Tue, 21 December 2010 19:36 UTC

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Date: Wed, 22 Dec 2010 08:38:16 +1300
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Organization: University of Auckland
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Cc: nbs@ietf.org, christian.vogt@ericsson.com
Subject: Re: [nbs] Name->Locator validation. (Was: Re: A suggestion for an "on-demand API".)
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...
> The basic question is, is it enough with the name->locator binding being
> OK in the beginning of the connection or must it be valid throughout the
> connection.
> 
> Having a "last verified time-stamp" makes it very explicit that the
> name->locator binding was valid at that given point in time.
> 
> This leaves it open for a continual polling to the nameing system if
> that is what is required by that nameing system and the application.
> 
> It also leaves it open to the application to decide whether or not it is
> OK to have a valid name->locator binding at the beginning of the
> connection or not.

As is noted in draft-carpenter-referral-ps, these bindings
(and even nameless locators) have finite lifetimes, known at their
point of origin (from DHCP, SLAAC, DNS TTL, etc.) The problem shouldn't
be stated as timestamps or a need for polling. Quoting that draft:
"A referral that does not convey the lifetime associated with
an address is problematic." The lifetime should be carried with
the binding, and counted down locally.

      Brian