Re: [pcp] PCP Draft 29 question about PREFER_FAILURE and Suggested External Address field of all zeroes

Norman Sardella <sardella@comcast.net> Fri, 15 February 2013 13:16 UTC

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Date: Fri, 15 Feb 2013 08:15:57 -0500
From: Norman Sardella <sardella@comcast.net>
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To: Dan Wing <dwing@cisco.com>
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Subject: Re: [pcp] PCP Draft 29 question about PREFER_FAILURE and Suggested External Address field of all zeroes
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Yes, I'm good with that.

Thanks

On 02/14/2013 05:21 PM, Dan Wing wrote:
>> -----Original Message-----
>> From: pcp-bounces@ietf.org [mailto:pcp-bounces@ietf.org] On Behalf Of
>> Norman Sardella
>> Sent: Thursday, February 14, 2013 11:53 AM
>> To: pcp@ietf.org
>> Subject: [pcp] PCP Draft 29 question about PREFER_FAILURE and Suggested
>> External Address field of all zeroes
>>
>> In draft-ietf-pcp-base-29,
>>    "Section 13.2.  PREFER_FAILURE Option for MAP Opcode", The draft
>> mentions that when PREFER_FAILURE is set,
>>     "all-zeros IPv4 or all-zeros IPv6 address in the Suggested External
>>      Address field, it is invalid."
>>
>> Is this a valid case? Its unclear in a CGNAT/DS-LITE environment where
>> the CPE would be running a UPnP to PCP gateway and the CGNAT equipment
>> provides an External Address, how the CPE could provide an initial PCP
>> MAP request with an External IP Address when the CGNAT device maintains
>> them.
>
> The draft says:
>
>     If a PCP request contains the PREFER_FAILURE option and has zero in
>     the Suggested External Port field, or has the all-zeros IPv4 or all-
>     zeros IPv6 address in the Suggested External Address field, it is
>     invalid.
>
> I believe it should say:
>
>     If a PCP request contains the PREFER_FAILURE option and has zero in
>     the Suggested External Port field, or has the all-zeros IPv4 or all-
> ......................................^^
>                                       "and"
>     zeros IPv6 address in the Suggested External Address field, it is
>     invalid.
>
> http://tools.ietf.org/html/draft-ietf-pcp-upnp-igd-interworking is the
> canonical document explaining the interworking function, which doesn't
> go into that level of detail.
>
> Would that fix the problem?
>
> -d
>
>> On a MAPPING update, I could see providing an Suggested External
>> Address
>>
>>
>> I understand that UPnP IGDv1 client allows to dictate mapping a specific
>> port, but its unclear in a CGNAT/DS-LITE environment how to specify an
>> Suggested External IP address.
>>
>>
>> On a MAPPING update, I could see providing an Suggested External
>> Address, but don't understand how a CPE provide the Suggested External
>> Address on an initial MAP request.
>>
>>> 13.2.  PREFER_FAILURE Option for MAP Opcode
>> ...
>>>
>>>     If a PCP request contains the PREFER_FAILURE option and has zero in
>>>     the Suggested External Port field, or has the all-zeros IPv4 or
>> all-
>>>     zeros IPv6 address in the Suggested External Address field, it is
>>>     invalid.  The PCP server MUST reject such a message with the
>>>     MALFORMED_OPTION error code.
>>
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