RE: Applications broken by diff-sev remarking?

> Dear diff-serv community,
> 
> I seem to recall that in the very early days of diff-serv, there was some
> kind of survey to establish whether there were any applications that would
> be broken if the TOS value (i.e. pre diff-serv days) was changed to any
> value other than the transmitted value.
> 
> Is there a list of applications known to show problems with remapping of
> TOS values, and which could therefore be considered "Non diff-serv
> compliant"?
> 
> Any answers most appreciated,
> 
> Simon
> 
> -----------------------------------------------------------------
> Simon Carter 
> IP Network Engineering, BTexact Technologies
> MLB G pp8, Adastral Park, Martlesham Heath,
> Ipswich, IP5 3RE, UK
> simon.f.carter <at> bt.com
> Tel:	 +44 1473 606360
> Fax:	 +44 1473 606727
> -----------------------------------------------------------------
> 

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Re: RE: Applications broken by diff-sev remarking?

The problem we identified was a very small number of TCP implementations
that failed if the TOS byte is changed on the return packets. I don't recall
any application dependencies (although of course anything is possible).

   Brian

simon.f.carter <at> bt.com wrote:
> 
> > Dear diff-serv community,
> >
> > I seem to recall that in the very early days of diff-serv, there was some
> > kind of survey to establish whether there were any applications that would
> > be broken if the TOS value (i.e. pre diff-serv days) was changed to any
> > value other than the transmitted value.
> >
> > Is there a list of applications known to show problems with remapping of
> > TOS values, and which could therefore be considered "Non diff-serv
> > compliant"?
> >
> > Any answers most appreciated,
> >
> > Simon
> >
> > -----------------------------------------------------------------
> > Simon Carter
> > IP Network Engineering, BTexact Technologies
> > MLB G pp8, Adastral Park, Martlesham Heath,
> > Ipswich, IP5 3RE, UK
> > simon.f.carter <at> bt.com
> > Tel:   +44 1473 606360

Diffserv list information

Subscribers to the diffserv list might be interested to know 
on an average day, we intercept about ten undesirable messages
to the list, mostly pure spam, but including two or three copies
of the Klez virus. I suspect that one or several people who
are subscribed to this list may be infected with Klez, so I
recommend everybody who uses Windows to check that their virus 
protection is up to date.

   Brian

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(no subject)

hi:)
	can i ask you a question?
	i am doubted about the QOS routing.
	my view is:
	the object of QOS routing is to meet the strict QOS constrain of per-flow,is it right?
	it just fit  the model of guarantee service in Intserv,but as we know ,the Interv has the Scalability problem,
	and now we are interesting in the research of Diffserv model.but in the Differv,flows are aggregated in a
PHB unit,
	so how can we guarantee the per-flow QOS in this aggregated model?  e.g the end to end delay is a cumulative
QOS parameter,when we queue aggregated flows in the same queue in the router,how can we determine the
delay bound in this router for each flow packets?
	so how can we use QOS routing in the Diffserv model?
	
	thank you very much:)

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Re: (no subject)

The diffserv architecture does not guarantee anything per flow.
All it offers is statistical constraints on a complete traffic
aggregate. This applies with or without QOS routing.

Please continue this discussion on the diffserv-interest list.
See http://www1.ietf.org/mailman/listinfo/diffserv-interest

   Brian Carpenter

hchang wrote:
> 
> hi:)
>         can i ask you a question?
>         i am doubted about the QOS routing.
>         my view is:
>         the object of QOS routing is to meet the strict QOS constrain of per-flow,is it right?
>         it just fit  the model of guarantee service in Intserv,but as we know ,the Interv has the Scalability problem,
>         and now we are interesting in the research of Diffserv model.but in the Differv,flows are aggregated in a
PHB unit,
>         so how can we guarantee the per-flow QOS in this aggregated model?  e.g the end to end delay is a cumulative
QOS parameter,when we queue aggregated flows in the same queue in the router,how can we determine the
delay bound in this router for each flow packets?
>         so how can we use QOS routing in the Diffserv model?
> 
>         thank you very much:)
> 
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> diffserv <at> ietf.org
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question about diffServ

Hello !

I am Geunhyung Kim.
I investigate what the differentiation is in the diffServ architecture.
I don't have any idea about that.

In my opinion, there should be quantitative difference between classes to estabilish the service.
is that correct ?

Could I get some information about SLA adopted for business using diffserv architecture ?

Thanks in advance

Geunhyung Kim

None of us is as smart as all of us
==========================================
Geunhyung Kim

E-mail: geunkim <at> postech.edu

Tel: +82-54-279-5655
Fax: +82-54-279-5699

Networking & Distributed Systems Lab.
CSE
POSTECH
===========================================

_______________________________________________

Re: question about diffServ

Please read RFC 3086, which I think is the best answer to your questions.
http://www.ietf.org/rfc/rfc3086.txt

Also please note that general discussion on diffserv belongs
on the diffserv-interest list
http://www1.ietf.org/mailman/listinfo/diffserv-interest

Regards
   Brian Carpenter

Geunhyung Kim wrote:
> 
> Hello !
> 
> I am Geunhyung Kim.
> I investigate what the differentiation is in the diffServ architecture.
> I don't have any idea about that.
> 
> In my opinion, there should be quantitative difference between classes to estabilish the service.
> is that correct ?
> 
> Could I get some information about SLA adopted for business using diffserv architecture ?
> 
> Thanks in advance
> 
> Geunhyung Kim
> 
> None of us is as smart as all of us
> ==========================================
> Geunhyung Kim

User defined DSCP Mappings

Hi,

It is possible to have a custom mapping between DSCP values and 
classes of service.  Under which circumstances, one would need
to use such custom mappings? Is it not enough to have the same
DSCP-to-service mappings as suggested in the AF and EF RFCs?

Thanks,
BalaSankar.R

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Re: User defined DSCP Mappings

Some ISPs stated a very strong requirement to have the flexibility
to create local mappings, since they did not want their service
offerings to be limited by the standard. This was the rough consensus
established in the diffserv WG interim meeting in June 1998.
(Not everyone agreed, but that's the nature of IETF consensus.)

I've answered this question on the WG mailing list since it is a piece
of very basic diffserv history that everyone needs to know, but please 
follow up on the diffserv-interest list only.

Regards
   Brian Carpenter
   diffserv co-chair
   INET 2002, Washington, DC, 18-21 June http://www.inet2002.org

"Balasankar R - CTD, Chennai." wrote:
> 
> Hi,
> 
> It is possible to have a custom mapping between DSCP values and
> classes of service.  Under which circumstances, one would need
> to use such custom mappings? Is it not enough to have the same
> DSCP-to-service mappings as suggested in the AF and EF RFCs?
> 
> Thanks,
> BalaSankar.R

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Request Help for Survey about DiffServ, and DiffServ in Intra-domain