Re: [pcp] PCP Draft 29 question about PREFER_FAILURE and Suggested External Address field of all zeroes
"Dan Wing" <dwing@cisco.com> Thu, 14 February 2013 22:21 UTC
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From: Dan Wing <dwing@cisco.com>
To: 'Norman Sardella' <sardella@comcast.net>, pcp@ietf.org
References: <511D40B5.70104@comcast.net>
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Date: Thu, 14 Feb 2013 14:21:18 -0800
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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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> -----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. > > _______________________________________________ > pcp mailing list > pcp@ietf.org > https://www.ietf.org/mailman/listinfo/pcp
- [pcp] PCP Draft 29 question about PREFER_FAILURE … Norman Sardella
- Re: [pcp] PCP Draft 29 question about PREFER_FAIL… Dan Wing
- Re: [pcp] PCP Draft 29 question about PREFER_FAIL… Norman Sardella