IETF Logo Mail Archive

Re: [v6ops] ref Hosts dont MLD to join LL groups

Andrew 👽 Yourtchenko <ayourtch@gmail.com> Wed, 22 July 2015 13:40 UTC

Return-Path: <ayourtch@gmail.com>
X-Original-To: v6ops@ietfa.amsl.com
Delivered-To: v6ops@ietfa.amsl.com
Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A78F71A8BC3 for <v6ops@ietfa.amsl.com>; Wed, 22 Jul 2015 06:40:00 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -1.7
X-Spam-Level:
X-Spam-Status: No, score=-1.7 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, MIME_8BIT_HEADER=0.3, SPF_PASS=-0.001] autolearn=no
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 BnGtdvVuswxA for <v6ops@ietfa.amsl.com>; Wed, 22 Jul 2015 06:39:59 -0700 (PDT)
Received: from mail-wi0-x22c.google.com (mail-wi0-x22c.google.com [IPv6:2a00:1450:400c:c05::22c]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id DDF731B33E7 for <v6ops@ietf.org>; Wed, 22 Jul 2015 06:38:08 -0700 (PDT)
Received: by wibud3 with SMTP id ud3so173031592wib.0 for <v6ops@ietf.org>; Wed, 22 Jul 2015 06:38:07 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=content-type:mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=nkitxnewx56WPBDUMJph1a1isRaauSMr+Jj12TkjRKw=; b=s3wklyejtdVUhkmsYjW7rOP9jrjUSuptQjV/XMpIwKRxXlfv3wvH3Z81U48srpparq TUJpjY6aUF7gZqrD1bu0GkmMu5zx5LKOuIPlTeqSSdcyQmgld5w+RMM9pSGL/2uhsOkK O37/0HvxQyMgY/wgqJShoh3qWHXCzoIVgO/68m9A7fAB+q9vP1cJ0oSfMETFhNN+iGnJ lK8I/zvFtGeBY3QJP/xuA8Zdbk40aGN2rHs9qDjJC3Ef6VCHjJBVeM9Q8wn06XQwz1Ne m7I+f4cgqeTE9BzDp5LUI7XrRAAFU3JddIJ2pK938BafCyrI6rK2o3uspjPcnZmdjTTV zNSw==
X-Received: by 10.194.185.180 with SMTP id fd20mr5058403wjc.16.1437572287437; Wed, 22 Jul 2015 06:38:07 -0700 (PDT)
Received: from ?IPv6:2001:67c:1231:998:f953:417a:1305:9948? ([2001:67c:1231:998:f953:417a:1305:9948]) by smtp.gmail.com with ESMTPSA id l2sm3483823wib.11.2015.07.22.06.38.05 (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Wed, 22 Jul 2015 06:38:06 -0700 (PDT)
Content-Type: text/plain; charset="windows-1251"
Mime-Version: 1.0 (1.0)
From: Andrew 👽 Yourtchenko <ayourtch@gmail.com>
X-Mailer: iPhone Mail (12H143)
In-Reply-To: <5CD05758-D7B7-476D-9936-E5A1D0614AF8@employees.org>
Date: Wed, 22 Jul 2015 15:38:04 +0200
Content-Transfer-Encoding: quoted-printable
Message-Id: <F666A76F-0CFB-4875-9262-4F276D2D6950@gmail.com>
References: <55AE42A4.8020908@gmail.com> <5CD05758-D7B7-476D-9936-E5A1D0614AF8@employees.org>
To: Ole Troan <otroan@employees.org>
Archived-At: <http://mailarchive.ietf.org/arch/msg/v6ops/MSKtQmZcwxvx9iETMha6kdKCdi0>
Cc: "v6ops@ietf.org" <v6ops@ietf.org>
Subject: Re: [v6ops] ref Hosts dont MLD to join LL groups
X-BeenThere: v6ops@ietf.org
X-Mailman-Version: 2.1.15
Precedence: list
List-Id: v6ops discussion list <v6ops.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/v6ops>, <mailto:v6ops-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/v6ops/>
List-Post: <mailto:v6ops@ietf.org>
List-Help: <mailto:v6ops-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/v6ops>, <mailto:v6ops-request@ietf.org?subject=subscribe>
X-List-Received-Date: Wed, 22 Jul 2015 13:40:00 -0000


On 22 Jul 2015, at 14:27, Ole Troan <otroan@employees.org> wrote:

>> Regarding the mic discussion about unicast RAs a SHOULD.
>> 
>> I have been directed that the reference saying that Hosts dont MLD to join multicast groups is RFC3810:
>> 
>> "  The link-scope all-nodes multicast address, (FF02::1), is handled as
>>  a special case.  On all nodes -- that is all hosts and routers,
>>  including multicast routers -- listening to packets destined to the
>>  all-nodes multicast address, from all sources, is permanently enabled
>>  on all interfaces on which multicast listening is supported.  No MLD
>>  messages are ever sent regarding neither the link-scope all-nodes
>>  multicast address, nor any multicast address of scope 0 (reserved) or
>>  1 (node-local).”
> 
> I do wonder if we should expand that exception to all link-scope multicast addresses.
> 
> the bridge implementors I speak to tell me that they don’t have enough state to do MLD snooping for link-local scoped multicast addresses anyway...

I hear similar, but in my interpretation they say this in the context of solicited node multicast groups, not in general about link-local groups.

OTOH it is easy to just flood link-local groups, right ? If so - getting rid of MLD seems like extra work to get something already possible ? (Also, adding complexity of dealing with the "pre" and "post" hosts)

--a


> 
> cheers,
> Ole
> _______________________________________________
> v6ops mailing list
> v6ops@ietf.org
> https://www.ietf.org/mailman/listinfo/v6ops

v2.29.0 | Report a Bug | By Email | System Status