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Re: An Internet-Draft on literal scoped addresses with accompanying zone IDs in URIs

From: JORDI PALET MARTINEZ <jordi.palet@consulintel.es>
Date: Fri, 19 Nov 2004 20:32:29 +0100
To: Bill Fenner <fenner@research.att.com>
CC: <uri@w3.org>, <ipv6@ietf.org>
Message-ID: <BDC408DD.50F37%jordi.palet@consulintel.es>

Agree, I suggested the same a few weeks ago ...

Regards,
Jordi


> De: Bob Hinden <bob.hinden@nokia.com>
> Responder a: ipv6-bounces@ietf.org
> Fecha: Fri, 19 Nov 2004 10:48:38 -0800
> Para: Bill Fenner <fenner@research.att.com>
> CC: uri@w3.org, ipv6@ietf.org
> Asunto: Re: An Internet-Draft on literal scoped addresses with accompanying
> zone IDs in URIs
> 
> Bill,
> 
>>   Some think that this problem space is so small it's not worth it; I think
>> it's at least worth throwing out a strawman and seeing what happens to it,
>> especially since this proposal includes a modification to the grammar for
>> zone IDs in draft-ietf-ipv6-scoping-arch; better to do that before it gets
>> published as an RFC if we're going to.
> 
> I agree that doing this is worthwhile even for the few cases where it will
> be used.
> 
> A few comments on the tradeoffs.
> 
>> 2.1  Tradeoffs
>> 
>>    o  Use _ or Z or some other character as separator.
>>       Pro:
>>          +  Fits current ABNF.
>>          +  Doesn't require confusing percent-encoding.
>>       Con:
>>          +  Have to remember different separator.
>>          +  Can't copy and paste from other forms.  (But that is the
>>             case also for percent-encoding, which usually doesn't happen
>>             automatically.)
> 
> I think loosing the ability to cut and paste these addresses is a
> problem.  The % is in widespread usage today.  For example from the machine
> I am typing on:
> 
>  Connection-specific DNS Suffix  . : americas.nokia.com
>  Description . . . . . . . . . . . : Intel(R) PRO/100 VE Network Connection
>  Physical Address. . . . . . . . . : 00-0D-60-2F-8D-F5
>  Dhcp Enabled. . . . . . . . . . . : Yes
>  Autoconfiguration Enabled . . . . : Yes
>  IP Address. . . . . . . . . . . . : 172.19.69.87
>  Subnet Mask . . . . . . . . . . . : 255.255.255.0
>  IP Address. . . . . . . . . . . . : fe80::20d:60ff:fe2f:8df5%4
>  Default Gateway . . . . . . . . . : 172.19.69.1
>  DHCP Server . . . . . . . . . . . : 172.18.140.14
>  DNS Servers . . . . . . . . . . . : 172.18.140.17
>                                      172.18.241.9
>                                      131.228.6.22
>                                      fec0:0:0:ffff::1%1
>                                      fec0:0:0:ffff::2%1
>                                      fec0:0:0:ffff::3%1
>  Primary WINS Server . . . . . . . : 10.241.36.9
>  Secondary WINS Server . . . . . . : 10.241.36.8
>  Lease Obtained. . . . . . . . . . : November 19, 2004 08:41:58 AM
>  Lease Expires . . . . . . . . . . : November 22, 2004 08:41:58 AM
> 
> It would be much better if these addresses could be cut/paste without
> having to also convert the % to something else.
> 
>>       Issues:
>>          +  Zone ID is currently loosely specified in scoping-arch; in
>>             order to fit this grammar it needs to be tighter.
>>          +  Should "_" (or whatever delimiter) be allowed in the zone
>>             ID? ("No" complicates the ABNF)
>>          +  Can a scoping-arch revision change the character in use? It
>>             could suggest that "_" can be used as an alternative to "%".
> 
> As above, the "%" is current usage.
> 
>>    o  Use %25 as an encoded %, the scoping-arch separator.
>>       Pro:
>>          +  "%" is the same character.
>>       Con:
>>          +  "%25" is confusing.
>>          +  Can't copy and paste from other forms where the % is not
>>             encoded.  (But that is the case also when using a different
>>             character for the separator.)
>>          +  IPvFuture ABNF doesn't permit percent-encoded characters.
> 
> Agree this is very ugly and IMHO worse than "-".
> 
> My dump question (that exposes my lack of knowledge about URIs/etc.) is
> since the literal IPv6 address are enclosed in "[" "]" to allow for the ":"
> in the literal IPv6 address, why can't the "%" be used in the same
> way?  For example:
> 
>  http://[fe80::20d:60ff:fe2f:8df5%4]
> 
> Please excuse my ignorance on this, but it would be good to explain this
> (and include this information in the draft).
> 
> Thanks,
> Bob
> 
> 
> 
> 
> 
> 
> 
>>   The I-D announcement follows.  It's quite short, so please take a look.
>> 
>> Thanks,
>> 
>>   Bill & Martin.
>> 
>> ----- Begin forwarded message:
>> 
>> From: Internet-Drafts@ietf.org
>> Subject: I-D ACTION:draft-fenner-literal-zone-00.txt
>> Date: Thu, 18 Nov 2004 15:14:29 -0500
>> To: i-d-announce@ietf.org
>> Reply-to: internet-drafts@ietf.org
>> 
>> 
>>         Title           : A Format for IPv6 Scope Zone Identifiers in
>>                           Literal URIs
>>         Author(s)       : B. Fenner, M. Duerst
>>         Filename        : draft-fenner-literal-zone-00.txt
>>         Pages           : 9
>>         Date            : 2004-11-18
>> 
>> This document specifies the format to be used when specifying a zone
>>    identifier with a literal IPv6 address in URIs and IRIs.  While this
>>    combination is expected to be needed rarely, it is important to
>>    specify the exact syntax.
>> 
>> A URL for this Internet-Draft
>> is:http://www.ietf.org/internet-drafts/draft-fenner-literal-zone-00.txt
>> 
>> To remove yourself from the I-D Announcement list, send a message to
>> i-d-announce-request@ietf.org with the word unsubscribe in the body of the
>> message.
>> You can also visit https://www1.ietf.org/mailman/listinfo/I-D-announce
>> to change your subscription settings.
>> 
>> 
>> Internet-Drafts are also available by anonymous FTP. Login with the username
>> "anonymous" and a password of your e-mail address. After logging in,
>> type "cd internet-drafts" and then
>>         "get draft-fenner-literal-zone-00.txt".
>> 
>> A list of Internet-Drafts directories can be found in
>> http://www.ietf.org/shadow.html
>> or ftp://ftp.ietf.org/ietf/1shadow-sites.txt
>> 
>> 
>> Internet-Drafts can also be obtained by e-mail.
>> 
>> Send a message to:
>>         mailserv@ietf.org.
>> In the body type:
>>         "FILE /internet-drafts/draft-fenner-literal-zone-00.txt".
>> 
>> NOTE:   The mail server at ietf.org can return the document in
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>> 
>> 
>> 
>> ----- End forwarded message:
>> 
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Received on Saturday, 20 November 2004 00:10:53 GMT

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