Re: [v4tov6transition] Comment on draft-despres-softwire-6a44-01.txt

Brian E Carpenter <> Sat, 16 October 2010 03:39 UTC

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Date: Sat, 16 Oct 2010 16:40:05 +1300
From: Brian E Carpenter <>
Organization: University of Auckland
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To: Dong Zhang <>
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Cc: softwires <>, v4tov6transition <>
Subject: Re: [v4tov6transition] Comment on draft-despres-softwire-6a44-01.txt
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On 2010-10-16 15:15, Dong Zhang wrote:
> Hi Remi,
> Please see inline.

>>> Is the A:W<->N:Z mapping created staticly? Or dynimicly?
>> Dynamically when the 6a44-C starts operation.
>> It then remains static until the 6a44 client or the NAT is reset. 
> That is say it is similar to a kind of permanent state once the mapping is created, supposing that there no NAT reboot and power off. Right? If so, the interruption issue of CPE should be considered. 6a44 still needs to guarantee the state recovery, right?

Why? When I have to restart my IPv4-only ADSL box, I lose all
sessions, and for all I know I get a different IPv4 address.
So why do I care if 6a44 loses state too?

Certainly the IPv6 client host must be forced to restart
the 6a44 process when this happens. We do need a method of
forcing that.