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Re: [BEHAVE] draft-xu-behave-nat-state-sync-00

Dave Thaler <dthaler@microsoft.com> Wed, 25 November 2009 23:32 UTC

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From: Dave Thaler <dthaler@microsoft.com>
To: Brian E Carpenter <brian.e.carpenter@gmail.com>, Dean Cheng <Chengd@huawei.com>
Thread-Topic: [BEHAVE] draft-xu-behave-nat-state-sync-00
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Date: Wed, 25 Nov 2009 23:31:38 +0000
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References: <4AFCBC87.20009@gmail.com> <C1463B96FBAB4A59B7B279C43BDCE778@china.huawei.com> <4AFCDCBD.8090403@gmail.com>
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Cc: "behave@ietf.org" <behave@ietf.org>
Subject: Re: [BEHAVE] draft-xu-behave-nat-state-sync-00
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Some other references:
http://genie.iitd.ernet.in/wipo/report/node28.html seems to use
it for mailbox sync in another thesis (with WinCE & Linux) in 2004.

http://www.netlab.tkk.fi/tutkimus/ipana/paperit/spiejose2.ppt
discusses an implementation in 1999.

It also looks like Nortel might have IPR in this area:
http://www.google.com/patents/about?id=YKYIAAAAEBAJ
although I don't see anything in the IETF IPR database.

-Dave

> -----Original Message-----
> From: behave-bounces@ietf.org [mailto:behave-bounces@ietf.org] On
> Behalf Of Brian E Carpenter
> Sent: Thursday, November 12, 2009 8:13 PM
> To: Dean Cheng
> Cc: behave@ietf.org
> Subject: Re: [BEHAVE] draft-xu-behave-nat-state-sync-00
> 
> It seems there was SCSP code in BSD some years ago, as part of the
> ATM support:
> 
> http://www.freebsd.org/releases/3.0R/notes.html
> 
> Also for Linux, it seems to be tied to ATM:
> 
> http://www.digipedia.pl/man/doc/view/scspd.8.html
> 
> I also found an MSc thesis discussing SCSP in SunOS 5.6.
> 
> Regards
>    Brian
> 
> On 2009-11-13 15:25, Dean Cheng wrote:
> > Brian,
> >
> >> -----Original Message-----
> >> From: behave-bounces@ietf.org [mailto:behave-bounces@ietf.org] On
> Behalf
> > Of
> >> Brian E Carpenter
> >> Sent: Thursday, November 12, 2009 5:55 PM
> >> To: behave@ietf.org
> >> Subject: [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.
> >
> > I don't know personally whether there is any available code, but
> > RFC2335 and RFC2443 documented two separate applications using SCSP,
> > although also about 10 years ago.
> >
> > However, SCSP (as mentioned in my presentation) itself heavily
> > "borrowed" link-state based algorithm and mechanisms from OSPF/ISIS
> > (also defined in 90's or earlier) that have been widely deployed
> since.
> >
> >> 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.
> >
> > Totally agreed.
> >
> > Dean
> >
> >>     Brian
> >>
> >> _______________________________________________
> >> Behave mailing list
> >> Behave@ietf.org
> >> https://www.ietf.org/mailman/listinfo/behave
> >
> >
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