[27535] in North American Network Operators' Group
TOS history?
daemon@ATHENA.MIT.EDU (Dana Hudes)
Tue Feb 22 00:03:58 2000
Message-ID: <018401bf7cf1$a291f420$3d5cdcd1@hudes.org>
From: "Dana Hudes" <dhudes@panix.com>
To: <nanog@merit.edu>
Date: Mon, 21 Feb 2000 23:59:43 -0500
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Hi folks, I'm busily writing up my next lecture for my TCP/IP course at =
CUNY Hunter
(text is Comer vol. 1 4th edition), the topic is the base Internet =
Protocol datagram format. I come to the TOS field which, as all know, =
was originally specified in the base IP specification RFC 791 then =
attempt to extend and reconcile it with later RFCs made in RFC 1349 =
followed subsequently in RFC 2474 in late 1998 which completely changed =
it to support DiffServ. In RFC 791 on page 11, Jon Postel writes:
Several networks offer service precedence, which somehow treats =
high
precedence traffic as more important than other traffic (generally
by accepting only traffic above a certain precedence at time of high
load). The major choice is a three way tradeoff between low-delay,
high-reliability, and high-throughput.
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?
How about DiffServ as specified in 2474 and 2475?
I believe there are router implementations but is anyone actually got it =
turned on ? Possibly only in an IP "intranet"?
Dana Hudes
CSCI Dept
CUNY Hunter College
