Re: [Softwires] MAP-T DMR and IPv4 address mapping
Ole Troan <otroan@employees.org> Thu, 06 June 2013 13:28 UTC
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From: Ole Troan <otroan@employees.org>
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Date: Thu, 06 Jun 2013 15:28:00 +0200
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To: Wojciech Dec <wdec.ietf@gmail.com>
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Cc: Softwires-wg <softwires@ietf.org>, Congxiao Bao <congxiao@cernet.edu.cn>
Subject: Re: [Softwires] MAP-T DMR and IPv4 address mapping
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> would like to get your feedback regarding a possible change to the way IPv4 addresses are mapped into the MAP-T DMR prefix. The current text, http://tools.ietf.org/html/draft-ietf-softwire-map-t-01#section-5.4 , follows RFC6052, and sees the IPv4 address inserted after the prefix. This aligns naturally with any/all existing NAT64 implementations, i.e. in a non-shared-address domain, a MAP-T CE would work with any regular NAT64 BR. > A direct consequence of following RFC6052 is that, in cases where the prefix is shorter than /64, it results in some "bit spreading" of the IPv4 address across the u-byte. See http://tools.ietf.org/html/rfc6052#page-5. This is likely to be cumbersome operationally. > > An option for simplifying this, and the change proposal seeking your feedback, would be to specify that the DMR should be a /64 prefix, or at least to make a recommendation to that effect in the specification. given that 6man is removing the special meaning of the U/G bits, perhaps RFC6052 should be updated, and MAP-T could ignore the U-byte? cheers, Ole
- [Softwires] MAP-T DMR and IPv4 address mapping Wojciech Dec
- Re: [Softwires] MAP-T DMR and IPv4 address mapping Ole Troan
- Re: [Softwires] MAP-T DMR and IPv4 address mapping Rajiv Asati (rajiva)
- Re: [Softwires] MAP-T DMR and IPv4 address mapping Senthil Sivakumar (ssenthil)
- Re: [Softwires] MAP-T DMR and IPv4 address mapping Congxiao Bao
- Re: [Softwires] MAP-T DMR and IPv4 address mapping Simon Perreault