[e2e] Routers accessing TCP header

Craig Partridge craig at aland.bbn.com
Tue Feb 22 09:08:38 PST 2005

In message <41004. at>, "Arjuna Sathiasee
lan" writes:

>Dear Jon,
>  Thanks for your appropriate reply. I am basically working on a mechanism
>called the Explicit Packet Drop Notification (EPDN).

While the mechanism is slightly different, this sounds like Explicit
Transport Error Notification (ETEN) done again.  See:

    Rajesh Krishnan, James P.G. Sterbenz, Wesley M. Eddy, Craig Partridge
    and Mark Allman, "Explicit transport error notification (ETEN) for 
    error-prone wireless and satellite networks," Computer Networks,
    46(3), October 2004, pp. 343-362.

I'll note that my co-authors and I continue to debate exactly how much
benefit such a service provides.  My reaction, from the "Oracle ETEN"
simulations in the paper (where we report the maximum improvement possible
if you know perfectly and immediately which packets are lost) is that
the gains are not enough to merit implementing the service.

Your mileage may vary!


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