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Re: [Softwires] 4rd Address Mapping - version-01

Leaf yeh <leaf.y.yeh@huawei.com> Sat, 24 September 2011 11:00 UTC

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Date: Sat, 24 Sep 2011 11:03:12 +0000
From: Leaf yeh <leaf.y.yeh@huawei.com>
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Cc: Softwires-wg <softwires@ietf.org>, "fine_sz@huawei.com" <fine_sz@huawei.com>
Subject: Re: [Softwires] 4rd Address Mapping - version-01
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The following is my quick comments & questions on the new updated draft.



https://datatracker.ietf.org/doc/draft-despres-softwire-4rd-addmapping/?include_text=1



Section 6



   …Its CE IPv6 prefix, Rule IPv6 prefix, and Rule

   IPv4 prefix, are supposed to be respectively 2001:db4:4444:4000::/52,

   2001:db0::/28, and 192.32../12 (i.e. 0x602). …



C1. The 1st 3 hex of the Rule IPv4 prefix, 0x602, should turn to be 96.32.0.0/12, right?



Section 7



Item                        Hexadecimal Value        Nb of bits



   - IPv4 port          :            8488                      16

   - Derived

      Max Port-set ID   :             488                      12

   - IPv4 address       :      60244444                        32

   - Rule IPv4 prefix

      that matches this

      IPv4 address      :      602                             12

   - Resulting CE index :         44444488                     32

   - Rule IPv6 prefix

      of the Rule       :  20010DB                             28

   - Padding to 64 bits :                 0                     4

   - Resulting

      CE IPv6 address   :  20010DB44444488002005EFE00000000   128

   - Prefix routed

      to the CE         :  20010DB444444                       52
-------------------------------------------------


C2. I supposed the CE IPv6 address is associated with the CE index (including part of IPv4 address delegated & masked by the Rule IPv4 prefix + the fixed PSID) to identify the unique CE device, not associated the dynamic part of the IPv4 layer-4 port. Otherwise, there will be a bunch of IPv6 address associated with one CE.



Q1. Any more words for the understanding on the case definition of double-translation?





Best Regards,

Leaf





-----Original Message-----
From: softwires-bounces@ietf.org [mailto:softwires-bounces@ietf.org] On Behalf Of Rémi Després
Sent: Thursday, September 22, 2011 7:18 PM
To: Softwires-wg
Subject: [Softwires] 4rd Address Mapping - version-01



Alain, all,



We have just posted a new version of our I-D on the proposed 4rd Address Mapping.

It is available at

www.ietf.org/id/draft-despres-softwire-4rd-addmapping-01.txt



Our presentation will be based on THIS version, technically simpler than version -00.

Major differences and their justifications will be briefly explained.



Regards,

RD

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