Re: [BEHAVE] proprietary implementation v.s standardised protocols //re: draft-xu-behave-nat-state-sync-00

[Cameron Byrne <cb.list6 at gmail.com>]

On Thu, Nov 26, 2009 at 12:04 AM,  <mohamed.boucadair at orange-ftgroup.com> wrote:
>
> Dear Cameron,
>
> This may be true for 1+1 redundancy schemes, but what about N+1 ones?
>
> Cheers
> Med
>

One more point, macro-level state sync is not solvable problem.  In
today's world of RSS and AJAX, the session growth is in many short
sessions.  Sessions that are so short they  last less than 1 second.
Even the locally connected state sync cannot really keep up with
pushing the state table (millions of connections) between a pair of
NAT boxes in real time.  State-sync will be much less effective across
a WAN, and much much less effective in 1 + N or N +N in a WAN.  The
vendors i have talked to remain cautious about their ability to scale
1+1 without impacting overall system capacity, and when i say i am
concerned about performance they tell me to turn off state sync.

State sync is a very large implementation challenge for vendors, the
specific challenges are box specific, and i do not think the IETF can
meaningful improve this situation with yet another draft / protocol.

>
> -----Message d'origine-----
> De : Cameron Byrne [mailto:cb.list6 at gmail.com]
> Envoyé : mercredi 25 novembre 2009 18:50
> À : Xu Xiaohu
> Cc : BOUCADAIR Mohamed NCPI/NAD/TIP; Brian E Carpenter; behave at ietf.org
> Objet : Re: [BEHAVE] proprietary implementation v.s standardised protocols //re: draft-xu-behave-nat-state-sync-00
>
> On Wed, Nov 25, 2009 at 2:05 AM, Xu Xiaohu <xuxh at huawei.com> wrote:
>>
>>> -----邮件原件-----
>>> 发件人: behave-bounces at ietf.org [mailto:behave-bounces at ietf.org] 代表
>>> mohamed.boucadair at orange-ftgroup.com
>>> 发送时间: 2009年11月13日 14:41
>>> 收件人: Brian E Carpenter; behave at ietf.org
>>> 主题: Re: [BEHAVE] draft-xu-behave-nat-state-sync-00
>>>
>>>
>>> Dear all,
>>>
>>> I guess that the question should be asked priori to yours:
>>>
>>> Do we let vendors define their proprietary solutions or does the IETF define
>>> a solution based on standardised protocols to achieve reliable state
>>> synchronisation?
>>
>> For a small enterprise network, maybe it's acceptable to deploy two or more NAT boxes purchased from the same vendor for redundancy. However, for a large ISP network or large enterprise network, it is not reliable enough. For example, an abnormal packet will cause the router OS to crash, it is not absolutely acceptable. Hence I believe the standardization of NAT redundancy is necessary.
>>
>
> In the large scale NAT44 we run today, all vendors have 1+1
> proprietary state sync.  They also sync configuration and other OAM
> elements over this sync channel.  I do not think it is at all required
> for vendors to have a standard state sync.  If I deploy multiple
> vendors for NAT, i will keep the 1+1 pairs of the same vendor and use
> different vendor 1+1 pairs for higher level network topology driven
> redundancy, not local state synchronization.
>
> Cameron Byrne
> Principal Engineer
> T-Mobile USA
>
>> Xiaohu
>>
>>
>>> From a service provider perspective, I'd like to see a solution with IETF stamp
>>> so as to be included in our RFPs/analysis. Vendors are then free to propose
>>> more reliable solutions, if any, compared to the one standardised by IETF.
>>>
>>> Cheers,
>>> Med
>>>
>>>
>>> -----Message d'origine-----
>>> De : behave-bounces at ietf.org [mailto:behave-bounces at ietf.org] De la part de
>>> Brian E Carpenter
>>> Envoyé : vendredi 13 novembre 2009 02:55
>>> À : behave at ietf.org
>>> Objet : [BEHAVE] draft-xu-behave-nat-state-sync-00
>>>
>>> My question about this draft is whether there is available code and
>>> implementation experience with SCSP, which was defined in 1998.
>>>
>>> If there isn't code and experience, since it is a quite complex design, I would
>>> be a bit worried.
>>>
>>> On the other hand, I believe that something of the complexity of SCSP is
>>> absolutely required to provide reliable synchronisation.
>>> There is no simple, lightweight way to do this reliably.
>>>
>>>     Brian
>>>
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