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Re: TOS history?

  • From: Dana Hudes
  • Date: Tue Feb 22 09:09:36 2000

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.


----- Original Message ----- 
From: "William Allen Simpson" <>
To: "Dana Hudes" <>
Cc: <>
Sent: Tuesday, February 22, 2000 5:32 AM
Subject: Re: TOS history?

> Dana Hudes wrote:
> > 
> > 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 
> was supported.  This was especially important for dial-up links.
> (NetBlazer, Lan'sEnd, etc., none of which are in much use today.)
> I have also _set_ the low delay bit for telnet traffic on those boxen,
> but you don't telnet out of routers very often.
> I'd have to check the source, but I'm pretty sure I put at least some 
> of that stuff in Qualcomm/Sony cell phones and base stations, so it 
> might still be in use today.
> I have also used the TOS bits in a weighted fair queuing scheme.
> I never figured out how "high reliability" would be implemented.  I just 
> tried to never have low reliability. :-)
>     Key fingerprint =  17 40 5E 67 15 6F 31 26  DD 0D B9 9B 6A 15 2C 32

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