Re: [Uri-review] [Fwd: [BEHAVE] Last Call: draft-ietf-behave-turn-uri (Traversal Using Relays around NAT (TURN) Uniform Resource Identifiers) to Proposed Standard]

Howdy,

I do not believe this document is ready for publication, as I believe
the URI scheme documentation needs work.  As it stands now, the
scheme-specific processing required for this scheme is so great that I
believe a standard URI parser will not work with the scheme as it is
intended.  Looking, for example, at the CPAN module PERL::URI, the
operation of the standard behavior for path and port seem likely to
work contrary to this scheme's intention.  I also could not follow the
details of how this would work in relation to a DDDS remote hosting
option, as mentioned in section 1, and I believe that more descriptive
text may be required.

One area of particular concern is this:

"The URI resolution algorithm uses <scheme>, <host>, <port> and
   <transport> as input.  It also uses as input a list ordered by
   preference of TURN transports (UDP, TCP, TLS) supported by the
   application using the TURN client.  The output of the algorithm is a
   list of {IP address, transport, port} tuples that a TURN client can
   try in order to create an allocation on a TURN server."

Having a URI resolution method rely on a preference order associated
with a calling application seems very fragile.  There seems to be no way
to guarantee that the information on calling application would be preserved in
passing the URI to a parser.  If this input list is required, I suspect that
that it must be noted within a URI parameter to avoid unexpected or incorrect
results.

Since this mechanism involves a fairly distinctive URI resolution
mechanism, I suggest that this document also be reviewed by the URI
mailing list, in addition to URI-review.  It seems more likely to be
able to discuss how to best meet the requirements expressed within a
URI syntax more likely to be handled correctly by parsers already
deployed.

regards,

Ted Hardie

On Thu, Oct 15, 2009 at 7:58 AM, Magnus Westerlund
<magnus.westerlund@ericsson.com> wrote:
> Hi,
>
> As responsible AD I would really appreciate an URI review of the two
> proposed URI schemes.
>
> Thanks
>
> Magnus Westerlund
>
> IETF Transport Area Director
> ----------------------------------------------------------------------
> Multimedia Technologies, Ericsson Research EAB/TVM
> ----------------------------------------------------------------------
> Ericsson AB                | Phone  +46 10 7148287
> Färögatan 6                | Mobile +46 73 0949079
> SE-164 80 Stockholm, Sweden| mailto: magnus.westerlund@ericsson.com
> ----------------------------------------------------------------------
>
> The IESG has received a request from the Behavior Engineering for
> Hindrance Avoidance WG (behave) to consider the following document:
>
> - 'Traversal Using Relays around NAT (TURN) Uniform Resource Identifiers '
>   <draft-ietf-behave-turn-uri-03.txt> as a Proposed Standard
>
> The IESG plans to make a decision in the next few weeks, and solicits
> final comments on this action.  Please send substantive comments to the
> ietf@ietf.org mailing lists by 2009-10-29. Exceptionally,
> comments may be sent to iesg@ietf.org instead. In either case, please
> retain the beginning of the Subject line to allow automated sorting.
>
> The file can be obtained via
> http://www.ietf.org/internet-drafts/draft-ietf-behave-turn-uri-03.txt
>
>
> IESG discussion can be tracked via
> https://datatracker.ietf.org/public/pidtracker.cgi?command=view_id&dTag=18080&rfc_flag=0
>
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