[e2e] Types Of Service

Fernando Gont fernando at gont.com.ar
Thu Jul 31 13:22:03 PDT 2003

At 16:34 28/07/2003 -0700, you wrote:

>   *> However, only TCP, UDP, and RTP (which is built over UDP) come to my 
> mind,
>   *> they don't guarantee any specific type of service (for example, "low
>   *> delay", "high throughput", etc.) by themselves.
>   *>
>But in principle, they could.  The original IP specification DID
>include a TOS byte with delay and throughput bits.

Yes, but it didn't *guarantee* the service.

>   *> Besides that, for example, TCP provides a "realiable" byte stream. 
> However,
>   *> there are some errors that TCP won't catch, so if reliability is a real
>   *> issue, then another layer of error control must be built up on top 
> of TCP.
>   *>
>Presumably you are referring to local system errors between TCP and the
>applications.  This would ultimately have to be dealt with at the
>application layer, of course (see the classic E2E argument paper.)

What's the author/title of that paper? Is it available online?

>Or are you referring to the weakness of the TCP checksum?

Yes, that's what I was referring to.

Fernando Gont
e-mail: fernando at gont.com.ar || fgont at acm.org

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