Subject: [Softwires] [Technical Errata Reported] RFC7599 (5225)

From: RFC Errata System <[email-masked]>
Date: Wed, 3 Jan 2018 04:13:49 -0800 (PST)

The following errata report has been submitted for RFC7599,
"Mapping of Address and Port using Translation (MAP-T)".

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You may review the report below and at:
http://www.rfc-editor.org/errata/eid5225

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Type: Technical
Reported by: Ole Troan <[email-masked]>

Section: 6

Original Text
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In the case of an IPv4 prefix, the IPv4 address field is right-padded
with zeros up to 32 bits.  The PSID is left-padded with zeros to
create a 16-bit field.  For an IPv4 prefix or a complete IPv4
address, the PSID field is zero.

Corrected Text
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The PSID is left-padded with zeros to
create a 16-bit field.  For an IPv4 prefix or a complete IPv4
address, the PSID field is zero.

Notes
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This text has been copied from RFC7597 (MAP-E). While it is correct in the context of MAP-E, for MAP-T the complete IPv4 source address must be embedded in the interface-identifier for correct translation in the case of an IPv4 prefix. Right padding the prefix with zeroes would lead to the translated packet having all zeroes in its source address.

Instructions:
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RFC7599 (draft-ietf-softwire-map-t-08)
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Title               : Mapping of Address and Port using Translation (MAP-T)
Publication Date    : July 2015
Author(s)           : X. Li, C. Bao, W. Dec, Ed., O. Troan, S. Matsushima, T. Murakami
Category            : PROPOSED STANDARD
Source              : Softwires
Area                : Internet
Stream              : IETF
Verifying Party     : IESG