Jari,
Le 28-juil.-08 à 23:53, Jari Arkko a écrit :
Olivier,
The only case where you would detect problems with mapping are
when a single host is opening a single TCP connection. In this
case, the SYN packet will be delayed by the mapping. Note that
using the DNS also causes such a delay...
If EXPLISP needs to perform an evaluation, I would suggest to
perform the evaluation based on packet traces or netflow traces as
we did and not only on lab experiments with limited traffic.
Indeed, that would be the reasonable way to do it. I'm glad to
learn that you've done some evaluations already! (Is there a chance
that you could talk about some of your experiments in EXPLISP?)
We already presented the results at RRG in Chicago. But we can redo
the presentation without any problem.
Luigi
I am having network trouble accessing the papers for some reason,
but I wanted to point out two specific things that I'm worried about.
First, we often see a heavily tail in traffic distributions. While
a large network concentrates much of its traffic to a small set of
destinations (say, google, microsoft, and youtube), there is a very
large set of other destinations as well that some small number of
users are accessing. I'm pretty sure I'm the only one accessing
certain domains in the IETF network, for instance.
Second, I'm not necessarily worried about the DNS lookup + SYN
case, and I don't believe the impact on that is very significant.
As was stated earlier, DNS already introduces some delay. But I'm
more worried about situations such as applications that do round-
robin or failover over a set of servers. The servers might come
from DNS at that point, be resolved much earlier, or be
communicated from someone else as IP addresses (such as would often
be the case in P2P systems). What are the effects on those
applications?
Jari
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Luigi Iannone
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