nanog mailing list archives
Re: TOS history?
From: "Dana Hudes" <dhudes () panix com>
Date: Tue, 22 Feb 2000 09:06:52 -0500
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 ----- 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?
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. :-) WSimpson () UMich edu Key fingerprint = 17 40 5E 67 15 6F 31 26 DD 0D B9 9B 6A 15 2C 32
Current thread:
- TOS history? Dana Hudes (Feb 21)
- Re: TOS history? William Allen Simpson (Feb 22)
- Re: TOS history? Dana Hudes (Feb 22)
- Re: TOS history? Paul Ferguson (Feb 24)
- Re: TOS history? William Allen Simpson (Feb 22)