Subject: [Softwires] [Errata Verified] RFC7599 (5225)

From: RFC Errata System <[email-masked]>
Date: Wed, 8 Jan 2020 14:05:03 -0800 (PST)

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

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

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Status: Verified
Type: Technical

Reported by: Ole Troan <[email-masked]>
Date Reported: 2018-01-03
Verified by: Éric Vyncke (IESG)

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.

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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