Re: [Softwires] [Fwd: I-D Action:draft-carpenter-softwire-sample-00.txt]

Hi Washam,

Thanks for your comments, see in line. These are my comments;
Sheng may want to comment too.

On 2010-06-08 20:30, WashamFan wrote:
> Hi,
> 
> There are some concerns after I skimmed over the draft.
> How many SIMPLE servers should be deployed in a metro
> network? 

Well, that (IMHO) would depend entirely on the load so I think
it is an engineering question.  Since /64 prefixes are abundant,
it would be trivial to have as many SAMPLE servers as you
need for the load.

> If SIMPLE servers are stateless, would anycast
> address be used for avalability and load-balancing?

Personally, I think that is complication with no value.
If the SIMPLE server is colocated with another single point
of failure such as the first hop router for a large group
of subscribers, I don't see why you would worry about
load balancing and availability.

> How does the ISP provision the IP address and port of
> SIMPLE servers to the hosts behind the IPv4-only CPEs?

That doesn't change; they are still provisioned for IPv4
exactly as they are today. The IPv4 service is not changed
in any way.

> If SIMPLE servers are stateless, I assume the multicast
> capability would be absent, right?

As described so far, SIMPLE is just the same as Teredo and
6to4 as far as multicast goes.

Regards,
     Brian

> 
> Thanks,
> washam
> ----- Original Message -----
> From: Brian E Carpenter <brian.e.carpenter@gmail.com>
> Date: Tuesday, June 8, 2010 0:26 am
> Subject: [Softwires] [Fwd: I-D Action:draft-carpenter-softwire-sample-00.txt]
> To: softwires@ietf.org
> 
> 
>> Hi,
>>  
>>  This is another approach to stateless tunnels across subscriber NATs.
>>  We've posted it in a preliminary form so that people can compare it with
>>  the SAM-based proposal presented in Anaheim and with draft-lee-softwire-6rd-udp.
>>  
>>      Brian + Sheng
>>  
>>  -------- Original Message --------
>>  Subject: I-D Action:draft-carpenter-softwire-sample-00.txt
>>  Date: Mon,  7 Jun 2010 00:30:02 -0700 (PDT)
>>  From: Internet-Drafts@ietf.org
>>  Reply-To: internet-drafts@ietf.org
>>  To: i-d-announce@ietf.org
>>  
>>  A New Internet-Draft is available from the on-line Internet-Drafts directories.
>>  
>>  	Title           : Legacy NAT Traversal for IPv6: Simple Address 
>> Mapping for Premises Legacy Equipment (SAMPLE)
>>  	Author(s)       : B. Carpenter, S. Jiang
>>  	Filename        : draft-carpenter-softwire-sample-00.txt
>>  	Pages           : 9
>>  	Date            : 2010-06-07
>>  
>>  IPv6 deployment is delayed by the existence of millions of subscriber
>>  network address translators (NATs) that cannot be upgraded to support
>>  IPv6.  This document specifies a mechanism for traversal of such
>>  NATs.  It is based on an address mapping and on a mechanism whereby
>>  suitably upgraded hosts behind a NAT may obtain IPv6 connectivity via
>>  a stateless server, known as a SAMPLE server, operated by their
>>  Internet Service Provider.  SAMPLE is an alternative to the Teredo
>>  protocol.
>>  
>>  A URL for this Internet-Draft is:
>>  http://www.ietf.org/internet-drafts/draft-carpenter-softwire-sample-00.txt
>>  
>>  
>>  
>>  _______________________________________________
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>>  
> 