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Date:      Wed, 7 Apr 1999 17:16:25 +0200
From:      Ladavac Marino <mladavac@metropolitan.at>
To:        'Walter Hafner' <hafner@informatik.tu-muenchen.de>, Joe Abley <jabley@clear.co.nz>
Cc:        freebsd-hackers@freebsd.org
Subject:   RE: IP Type of service (FTP proxy in German c`t)
Message-ID:  <97A8CA5BF490D211A94F0000F6C2E55D09758E@s-lmh-wi-900.corpnet.at>

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> -----Original Message-----
> From:	Walter Hafner [SMTP:hafner@informatik.tu-muenchen.de]
> Sent:	Wednesday, April 07, 1999 4:57 PM
> To:	Joe Abley
> Cc:	freebsd-hackers@freebsd.org; hafner@informatik.tu-muenchen.de
> Subject:	Re: IP Type of service (FTP proxy in German c`t)
>=20
> First of all:
>=20
> A couple of people mailed me directly and told me, that I'm probably
> the=20
> victim of an April fools joke of the c't (The article was in the
> April's=20
> issue). I had the suspection myself, therefore I tested the program
> before I posted.
>=20
> As you can see below, I really got speed improvements. If this is =
just
> coincidence, well, go on, laugh at me. :-)
>=20
> (Ok. You can stop now.)
>=20
> If not, then I see a problem.
>=20
>=20
>=20
> Joe Abley <jabley@clear.co.nz> writes:
>=20
> > If the intention is to accelerate downloads, then I don't think =
this
> > proxy is going to do much. It might promote the treatment of =
packets
> outbound
> > from the client if the rfc1349 precedence is set to 7, but it can
> have
> > no control over the return packets -- and that's where all the data
> is
> > on a download (which is what most people do).
	[ML]  Unless the proxy always tries to use passive mode thus
opening BOTH connections if the server supports it.  The observed
results would seem to agree.

> I had a look on 1349, as soon as I read the article. The article
> states, that "normally" all TOS and precedence settings from incoming
> packets are simply copied to the outgoing packets (which makes
> sense). That's the reason I checked the RFC. Unfortunately I didn't
> find
> it mentioned. RCF1195 doesn't say much about it either.
>=20
> I can't verify the assumption in detail (I=B4m no expert), but in a =
few
> quick tests I watched this or a similar behaviour:
>=20
	[ML]  One should really try to tcpdump the connections.

	[measurements deleted]

	Sounds like trouble

	/Marino



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