[Tsvwg] Re: [e2e] e2e principle..where??....

David P. Reed dpreed at reed.com
Tue Jun 5 05:42:12 PDT 2001

At 06:41 PM 6/4/01 -0400, Manish Karir wrote:

>so with this description a satellite system that uses 2 proxies
>on each end of a satellite link and does its own protocol between
>the proxies is also compatible with the e2e argument.
>so long as the bits comming out on the proxy1---server and
>proxy2--client are the same...?
>the only gurantee is that as you say.."the bits get delivered
>as sent......and the bits are unmodified..."
>so inbetween the 2 proxies compression etc...are all completely valid?

Not the same here, because we are talking about the TCP layer and not the 
IP layer.  The proxies here spoof acknowledgements, indicating the reliable 
and rapid delivery of packets to the other end, which hasn't happened by 
the time the proxy acks the packet.  This will crush any closed loop 
congestion control.

>If as you say, the e2e argument does not say what happens inside the
>network, then I guess the above would hold true....
>manish karir
>On Mon, 4 Jun 2001, David P. Reed wrote:
> > Since PPP is entirely below the IP layer, and transports IP datagrams
> > without modification, it is completely compatible with the end-to-end
> > argument. The end-to-end argument does not say what happens inside the
> > network - bits can be coded using red, blue, and quantum spins and
> > packets can be compressed in any way.  As long as the packet gets
> > delivered as sent (perhaps in legal fragments), at the destination
> > address, and the bits are unmodified from the way they were sent, then
> > the network performs no function for IP that is different from a
> > straight wire.
> >
> > >- David

- David
WWW Page: http://www.reed.com/dpr.html

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