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Date:	Tue, 12 Jan 2010 23:47:45 -0500
From:	Steven Blake <>
To:	"Philip A. Prindeville" <>
Subject: Re: [PATCH] ipv4: add DiffServ priority based routing

On Tue, 12 Jan 2010 13:33:05 -0800, "Philip A. Prindeville"
<> wrote:

> On 01/12/2010 01:03 PM, David Miller wrote:

>> What they do is they have a set of semantics inside of their cloud of
>> routers and switch points for diffserv, and when packets come in the
>> TOS field is rewritten to whatever scheme is being used inside of that
>> cloud.
> Uh, no.  Net Neutrality very much requires consistent end-to-end
> interpretation of ToS bits by backbone carriers.  If you know of a
> that isn't honoring ToS bits, I have a group of lawyers I'd like them to
> meet.

Few if any ISPs are honoring any DSCP bits outside of negotiated contracts.

>> And the diffserv bits only have meaning and effect within that cloud.
> Have you read RFC-2474 lately?  You only need to get as far as the
> Abstract:
>    The services may be either end-to-end or intra-domain; they include
>    both those that can satisfy quantitative performance requirements
>    peak bandwidth) and those based on relative performance (e.g., "class"
>    differentiation).
> "end-to-end"... seems pretty clear to me.

David's understanding of RFC 2474 is correct.


// Steve
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