From owner-freebsd-questions Mon Apr 9 16:57:24 2001 Delivered-To: freebsd-questions@freebsd.org Received: from be-well.ilk.org (lowellg.ne.mediaone.net [24.147.184.128]) by hub.freebsd.org (Postfix) with ESMTP id 8001037B423 for ; Mon, 9 Apr 2001 16:57:21 -0700 (PDT) (envelope-from lowell@be-well.ilk.org) Received: (from lowell@localhost) by be-well.ilk.org (8.11.3/8.11.3) id f39NvHk72166; Mon, 9 Apr 2001 19:57:17 -0400 (EDT) (envelope-from lowell) To: freebsd-questions@freebsd.org, singh@pdx.edu Subject: Re: Explicit Congestion Notification (ECN) FBSD 3.2 References: From: Lowell Gilbert Date: 09 Apr 2001 19:57:16 -0400 In-Reply-To: singh@pdx.edu's message of "8 Apr 2001 22:38:33 +0200" Message-ID: <4466gd8w4j.fsf@lowellg.ne.mediaone.net> Lines: 25 X-Mailer: Gnus v5.7/Emacs 20.7 Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG singh@pdx.edu (Harkirat Singh) writes: > I want to know about implementation and support of ECN in TCP/IP > stack of FreeBSD, is it a standard? Specifically to FreeBSD 3.2 I looked > at netinet but could not find any thing related to it. Do I need to get > some patch for ECN. No, there is no support for Explicit Congestion Notification in FreeBSD until the 4.x code branch. You could try patching it into your 3.2 sources, but that looks to be a non-trivial effort. > I looked at RFC 2481 and it says that ECN will be standard soon and some > of the OS developers have already incorporated this feature. I wonder is > it part of FreeBSD 3.2. The RFC is *extremely* careful to point out that it is only an experimental RFC, that it is *not* a standard, and that even the implementations it lists are described as experimental. There does appear to be movement toward making it a standard in the near future, but the standard being advanced is somewhat different from RFC 2481, so it's not clear that even the latest versions of FreeBSD will be compliant with the standard, if and when Explicit Congestion Notification becomes a standard. - Lowell To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message