IETF Logo Mail Archive

Re: 6MAN Adoption call on raft-chakrabarti-nordmark-6man-efficient-nd-04

Mikael Abrahamsson <swmike@swm.pp.se> Thu, 09 January 2014 12:44 UTC

Return-Path: <swmike@swm.pp.se>
X-Original-To: ipv6@ietfa.amsl.com
Delivered-To: ipv6@ietfa.amsl.com
Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A49C61AE0F7 for <ipv6@ietfa.amsl.com>; Thu, 9 Jan 2014 04:44:27 -0800 (PST)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -4.389
X-Spam-Level:
X-Spam-Status: No, score=-4.389 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HELO_EQ_SE=0.35, RCVD_IN_DNSWL_MED=-2.3, RP_MATCHES_RCVD=-0.538, SPF_PASS=-0.001] 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 dQ7dvI2ykbJ7 for <ipv6@ietfa.amsl.com>; Thu, 9 Jan 2014 04:44:25 -0800 (PST)
Received: from uplift.swm.pp.se (swm.pp.se [212.247.200.143]) by ietfa.amsl.com (Postfix) with ESMTP id 07E681AE247 for <ipv6@ietf.org>; Thu, 9 Jan 2014 04:44:24 -0800 (PST)
Received: by uplift.swm.pp.se (Postfix, from userid 501) id 7D3AF9C; Thu, 9 Jan 2014 13:44:14 +0100 (CET)
Received: from localhost (localhost [127.0.0.1]) by uplift.swm.pp.se (Postfix) with ESMTP id 758A69A; Thu, 9 Jan 2014 13:44:14 +0100 (CET)
Date: Thu, 09 Jan 2014 13:44:14 +0100
From: Mikael Abrahamsson <swmike@swm.pp.se>
To: Lorenzo Colitti <lorenzo@google.com>
Subject: Re: 6MAN Adoption call on raft-chakrabarti-nordmark-6man-efficient-nd-04
In-Reply-To: <CAKD1Yr03ZD3dDUpTWXUL_OiE_NYasUmpd9m1Ss6XoU0Qq_NCog@mail.gmail.com>
Message-ID: <alpine.DEB.2.02.1401091342250.20074@uplift.swm.pp.se>
References: <1F653502-AD41-4EB6-A43D-541356810DF2@employees.org> <CAKD1Yr1XPKibHenLMcNDRnfCht6X8tF2nMq1HgOiQv6eR9m6Yg@mail.gmail.com> <alpine.DEB.2.02.1401081305120.20074@uplift.swm.pp.se> <CAKD1Yr2AtF1CMqFxE1W63tXrS5OsbhJGfktN=sAaZtsBOSVg2Q@mail.gmail.com> <alpine.DEB.2.02.1401090707580.20074@uplift.swm.pp.se> <CAKD1Yr2yjPOWWHBx5dzwhNCT8fx9SEQg1wbPgGJSN3aS5bg5tg@mail.gmail.com> <alpine.DEB.2.02.1401090803040.20074@uplift.swm.pp.se> <CAKD1Yr25XJejF7sdHE2ycpcHNSyq=07+mKeLdj338=-LvsME-Q@mail.gmail.com> <alpine.DEB.2.02.1401090853090.20074@uplift.swm.pp.se> <CAKD1Yr03ZD3dDUpTWXUL_OiE_NYasUmpd9m1Ss6XoU0Qq_NCog@mail.gmail.com>
User-Agent: Alpine 2.02 (DEB 1266 2009-07-14)
Organization: People's Front Against WWW
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset="US-ASCII"; format="flowed"
Cc: 6man Chairs <6man-chairs@tools.ietf.org>, 6man WG <ipv6@ietf.org>
X-BeenThere: ipv6@ietf.org
X-Mailman-Version: 2.1.15
Precedence: list
List-Id: "IPv6 Maintenance Working Group \(6man\)" <ipv6.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/ipv6>, <mailto:ipv6-request@ietf.org?subject=unsubscribe>
List-Archive: <http://www.ietf.org/mail-archive/web/ipv6/>
List-Post: <mailto:ipv6@ietf.org>
List-Help: <mailto:ipv6-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/ipv6>, <mailto:ipv6-request@ietf.org?subject=subscribe>
X-List-Received-Date: Thu, 09 Jan 2014 12:44:27 -0000

On Thu, 9 Jan 2014, Lorenzo Colitti wrote:

> They would be rate-limited, just like any other ND packets on any 
> implementation worth its salt. I think an NS is 72 bytes including 
> ICMPv6 header; if so, then even if you send out 500 of them per second, 
> that's 36 kB/s. What sort of link has a problem carrying 36 kB/s? How 
> many NSes per second can routers send out anyway?

I don't know, people seem to indicate that there is a problem with 
multicast pps on wifi links. I haven't seen any hard data on this, it was 
just my interpretation that this was considered a problem.

> Maybe in terms of bandwidth, but that's not free - you're trading off 
> bandwidth with state. The state has to be maintained, recovered on 
> reboot, synchronized between multiple routers, etc. etc., and that is 
> brittle.

Yes, I agree.

-- 
Mikael Abrahamsson    email: swmike@swm.pp.se

v2.23.0 | Report a Bug | By Email