[27539] in North American Network Operators' Group
Re: TOS history?
daemon@ATHENA.MIT.EDU (Dana Hudes)
Tue Feb 22 09:08:49 2000
Message-ID: <009401bf7d3e$11cdaf40$3d5cdcd1@hudes.org>
From: "Dana Hudes" <dhudes@panix.com>
To: "William Allen Simpson" <wsimpson@greendragon.com>
Cc: <nanog@merit.edu>
Date: Tue, 22 Feb 2000 09:06:52 -0500
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thanks for the information all, and to Ping Pan for reminding me that we =
used to support TOS on the Milford router. I vaguely recall now that was =
a feature added late in the product lifecycle, so may have only been =
available on the IBM Global Network. It is a trivia problem at this =
point. I have sufficient material to revise my lecture notes.
Although I want to point out that low delay is RFC 791 back in 1981.
It had precedence and TOS specified. I know all routers support the =
precedence field, and its interesting
about the use of TOS and low delay to avoid dial-up links where =
possible.
Dana
----- Original Message -----=20
From: "William Allen Simpson" <wsimpson@greendragon.com>
To: "Dana Hudes" <dhudes@panix.com>
Cc: <nanog@merit.edu>
Sent: Tuesday, February 22, 2000 5:32 AM
Subject: Re: TOS history?
>=20
> Dana Hudes wrote:
> >=20
> > Was this something actually supported in the Internet? Widely? any =
examples of who?
> > Around when did it stop being supported?
> > Did anyone ever actually support RFC1349 in a host or router?
> >
> Yes, on the half-dozen or so routers that I worked on, the low delay =
bit=20
> was supported. This was especially important for dial-up links.
> (NetBlazer, Lan'sEnd, etc., none of which are in much use today.)
>=20
> I have also _set_ the low delay bit for telnet traffic on those boxen,
> but you don't telnet out of routers very often.
>=20
> I'd have to check the source, but I'm pretty sure I put at least some=20
> of that stuff in Qualcomm/Sony cell phones and base stations, so it=20
> might still be in use today.
>=20
> I have also used the TOS bits in a weighted fair queuing scheme.
>=20
> I never figured out how "high reliability" would be implemented. I =
just=20
> tried to never have low reliability. :-)
>=20
> WSimpson@UMich.edu
> Key fingerprint =3D 17 40 5E 67 15 6F 31 26 DD 0D B9 9B 6A 15 2C =
32
>=20
