Re: [Softwires] comments on draft-carpenter-softwire-sample-00

Hi Washam,

Don't forget there are also Softwire Hub-and-Spoke (L2TPv2 based) and 6rd+.
So far, we don't hear much response to support this work in the operator's
community.

Regards,
Yiu

On 9/27/10 9:49 PM, "WashamFan" <Washam.Fan@huaweisymantec.com> wrote:

> Hi,
> 
> Please see inline.
> 
> ----- Original Message -----
> From: Brian E Carpenter <brian.e.carpenter@gmail.com>
> Date: Tuesday, September 28, 2010 4:17 am
> Subject: Re: [Softwires] comments on draft-carpenter-softwire-sample-00
> To: WashamFan <Washam.Fan@huaweisymantec.com>
> Cc: softwires@ietf.org
> 
> 
>> Hi,
>>  
>>  On 2010-09-27 21:05, WashamFan wrote:
>>> Hi,
>>> 
>>> It says,
>>> 
>>>    The SAMPLE server will act as an IPv6 router.  In the simplest case,
>>>    it will forward all IPv6 packets to a default route, except those
>>>    whose destination address lies within the PSAMPLE prefix, which
>> will
>>>    be encapsulated and sent towards the host (CPE) and port
>> indicated by
>>>    the V4ADDR and PN values.
>>> 
>>> 
>>> I think it is not appropriate to assume NAT traversal without
>>> relay can be always successful.
>>  
>>  I don't understand your comment. If you have a NAT that you cannot
>>  traverse with UDP, you have many other problems, not just a lack
>>  of IPv6 connectivity.
> 
> I misunderstood. I thought the text implies direct tunnels established
> instead of hairpinning via SAMPLE server when SAMPLE client to
> SAMPLE client communication occurs .
> 
>>> Hairpinning might be always used
>>> for simplicity.
>>  
>>  Yes, that is the SAMPLE model. And it's a discussion for the
>>  community whether or not this is acceptable.
>>  
>>> 
>>> I'd like to know the status of the draft, is the WG pursuing this
>>> work?
>>  
>>  There are three drafts aiming at the same problem, SAMPLE,
>>  draft-lee-softwire-6rd-udp, and draft-despres-softwire-6rdplus.
>>  Please hold your breath, there's hope of a joint proposal
>>  from several authors within a few days.
> 
> Is it possible to combine all these efforts? I see 2 major
> difference between  draft-carpenter-softwire-sample-00
> and draft-lee-softwire-6rd-udp-02 at least:
> 
> 1. According to the IPv6 address assignment, SAMPLE
> is  to connect isolated IPv6 hosts but 6rd-udp is to connect
> both isolated IPv6 hosts and LANs.
> 
> 2. They are different in terms of IPv6 address assignment
> procedure. SAMPLE uses ND but 6rd-udp might use RADIUS,
> let's say.
> 
> Personally, I think it is meaningful to work on tunneling
> IPv6 traversing NAT, but I think we should justify the work
> by clarifying how bad Teredo did the job before we reinvent
> the wheel.
> 
> THanks,
> washam
> 
> 
>>     Brian
>>  
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