IETF Logo Mail Archive

Re: [ntpwg] New Version Notification for draft-ietf-ntp-network-time-security-12.txt and draft-ietf-ntp-using-nts-for-ntp-03.txt

Hal Murray <hmurray@megapathdsl.net> Wed, 23 December 2015 10:34 UTC

Return-Path: <ntpwg-bounces+ntp-archives-ahfae6za=lists.ietf.org@lists.ntp.org>
X-Original-To: ietfarch-ntp-archives-ahFae6za@ietfa.amsl.com
Delivered-To: ietfarch-ntp-archives-ahFae6za@ietfa.amsl.com
Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E8DD21ACE57 for <ietfarch-ntp-archives-ahFae6za@ietfa.amsl.com>; Wed, 23 Dec 2015 02:34:31 -0800 (PST)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -6.91
X-Spam-Level:
X-Spam-Status: No, score=-6.91 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_HI=-5, T_RP_MATCHES_RCVD=-0.01] autolearn=ham
Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 24iq9GEdqzvQ for <ietfarch-ntp-archives-ahFae6za@ietfa.amsl.com>; Wed, 23 Dec 2015 02:34:30 -0800 (PST)
Received: from lists.ntp.org (lists.ntp.org [149.20.68.7]) by ietfa.amsl.com (Postfix) with ESMTP id 7DFFF1ACE55 for <ntp-archives-ahFae6za@lists.ietf.org>; Wed, 23 Dec 2015 02:34:30 -0800 (PST)
Received: from lists.ntp.org (lists.ntp.org [149.20.68.7]) by lists.ntp.org (Postfix) with ESMTP id 6DCBD86DB29 for <ntp-archives-ahFae6za@lists.ietf.org>; Wed, 23 Dec 2015 10:34:30 +0000 (UTC)
X-Original-To: ntpwg@lists.ntp.org
Delivered-To: ntpwg@lists.ntp.org
Received: from mail1.ntp.org (mail1.ntp.org [IPv6:2001:4f8:fff7:1::5]) by lists.ntp.org (Postfix) with ESMTP id 8825A86D756 for <ntpwg@lists.ntp.org>; Wed, 23 Dec 2015 10:29:24 +0000 (UTC)
Received: from mail150c25.carrierzone.com ([64.29.147.220] helo=mail238c25-2586.carrierzone.com) by mail1.ntp.org with esmtps (TLSv1:AES256-SHA:256) (Exim 4.77 (FreeBSD)) (envelope-from <hmurray@megapathdsl.net>) id 1aBgfR-000AZI-0f; Wed, 23 Dec 2015 10:29:24 +0000
X-POP-User: hmurray@megapathdsl.net
Received: from ip-64-139-1-69.sjc.megapath.net (ip-64-139-1-69.sjc.megapath.net [64.139.1.69]) by mail238c25-2586.carrierzone.com (8.14.9/8.13.1) with ESMTP id tBNAT8vc002454; Wed, 23 Dec 2015 10:29:10 +0000
Received: from shuksan (localhost [127.0.0.1]) by ip-64-139-1-69.sjc.megapath.net (Postfix) with ESMTP id C59B1406057; Wed, 23 Dec 2015 02:29:07 -0800 (PST)
X-Mailer: exmh version 2.7.2 01/07/2005 with nmh-1.3
To: Harlan Stenn <stenn@ntp.org>
From: Hal Murray <hmurray@megapathdsl.net>
In-Reply-To: Message from Harlan Stenn <stenn@ntp.org> of "Wed, 23 Dec 2015 01:33:03 GMT." <E1aBYIZ-000D0R-7I@stenn.ntp.org>
Mime-Version: 1.0
Date: Wed, 23 Dec 2015 02:29:07 -0800
Message-Id: <20151223102907.C59B1406057@ip-64-139-1-69.sjc.megapath.net>
X-CSC: 0
X-CHA: v=2.1 cv=D5J+dJhj c=1 sm=1 tr=0 a=OWgXOY7Tc8w5m7k7nGX6Zw==:117 a=OWgXOY7Tc8w5m7k7nGX6Zw==:17 a=Y6MaXbqoAAAA:8 a=g0qM3YM6AAAA:8 a=txtmwFjVAAAA:8 a=kj9zAlcOel0A:10 a=wUQvQvOEmiQA:10 a=HzYgoGvUV6rJTx9VxGYA:9 a=CjuIK1q_8ugA:10
X-CTCH-RefID: str=0001.0A020202.567A7776.00B3, ss=1, re=0.000, recu=0.000, reip=0.000, cl=1, cld=1, fgs=0
X-CTCH-VOD: Unknown
X-CTCH-Spam: Unknown
X-CTCH-Score: 0.000
X-CTCH-Rules:
X-CTCH-Flags: 0
X-CTCH-ScoreCust: 0.000
X-SA-Exim-Connect-IP: 64.29.147.220
X-SA-Exim-Rcpt-To: stenn@ntp.org, ntpwg@lists.ntp.org
X-SA-Exim-Mail-From: hmurray@megapathdsl.net
X-SA-Exim-Version: 4.2
X-SA-Exim-Scanned: Yes (on mail1.ntp.org)
Subject: Re: [ntpwg] New Version Notification for draft-ietf-ntp-network-time-security-12.txt and draft-ietf-ntp-using-nts-for-ntp-03.txt
X-BeenThere: ntpwg@lists.ntp.org
X-Mailman-Version: 2.1.20
Precedence: list
List-Id: IETF Working Group for Network Time Protocol <ntpwg.lists.ntp.org>
List-Unsubscribe: <http://lists.ntp.org/options/ntpwg>, <mailto:ntpwg-request@lists.ntp.org?subject=unsubscribe>
List-Archive: <http://lists.ntp.org/pipermail/ntpwg/>
List-Post: <mailto:ntpwg@lists.ntp.org>
List-Help: <mailto:ntpwg-request@lists.ntp.org?subject=help>
List-Subscribe: <http://lists.ntp.org/listinfo/ntpwg>, <mailto:ntpwg-request@lists.ntp.org?subject=subscribe>
Cc: ntpwg@lists.ntp.org, hmurray@megapathdsl.net
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
Errors-To: ntpwg-bounces+ntp-archives-ahfae6za=lists.ietf.org@lists.ntp.org
Sender: ntpwg <ntpwg-bounces+ntp-archives-ahfae6za=lists.ietf.org@lists.ntp.org>

> DLM says the original expectation and plan was for mulitple extension fields
> to be allowed, and that the MAC, if present, would always be the last thing
> in the packet.

> If a new extention field was added to the packet that process should remove
> any previous MAC field and add a new one to the end of the packet.

> I'm curious if there is new information available that would show good
> reason why we should reconsider this. 

The rules for parsing the current MAC are ugly enough that I think a it would 
be progress if any changes in that area set things up so the MAC could follow 
normal rules with a length/type header.  (I think it's fine to require the 
MAC to be at the end of the packet.)

If you are looking for new information, I'd say we now appreciate how 
complicated the current MAC parsing rules are and/or how they interact with 
trying to use new extension fields.

Is anybody actually using ntp packets with extension fields other than a MAC? 
 How much do we have to grandfather in?


-- 
These are my opinions.  I hate spam.



_______________________________________________
ntpwg mailing list
ntpwg@lists.ntp.org
http://lists.ntp.org/listinfo/ntpwg

v2.23.0 | Report a Bug | By Email