Re: [netext] I-D Action: draft-ietf-netext-logical-interface-support-03.txt

Brian Haley <> Tue, 06 September 2011 13:34 UTC

Return-Path: <>
Received: from localhost (localhost []) by (Postfix) with ESMTP id 5BE5321F886A for <>; Tue, 6 Sep 2011 06:34:36 -0700 (PDT)
X-Virus-Scanned: amavisd-new at
X-Spam-Flag: NO
X-Spam-Score: -105.307
X-Spam-Status: No, score=-105.307 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, MISSING_HEADERS=1.292, RCVD_IN_DNSWL_MED=-4, USER_IN_WHITELIST=-100]
Received: from ([]) by localhost ( []) (amavisd-new, port 10024) with ESMTP id hJvqLgtoMROA for <>; Tue, 6 Sep 2011 06:34:35 -0700 (PDT)
Received: from ( []) by (Postfix) with ESMTP id BD81521F87D3 for <>; Tue, 6 Sep 2011 06:34:35 -0700 (PDT)
Received: from ( []) by (Postfix) with ESMTP id 1E6D72C031; Tue, 6 Sep 2011 13:36:22 +0000 (UTC)
Received: from [] ( []) by (Postfix) with ESMTP id 9CC6B14154; Tue, 6 Sep 2011 13:36:21 +0000 (UTC)
Message-ID: <>
Date: Tue, 06 Sep 2011 09:36:20 -0400
From: Brian Haley <>
Organization: HP Cloud Services
User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20110805 Lightning/1.0b2 Thunderbird/3.1.12
MIME-Version: 1.0
References: <>
In-Reply-To: <>
Content-Type: text/plain; charset="ISO-8859-1"
Content-Transfer-Encoding: 7bit
X-Mailman-Approved-At: Tue, 06 Sep 2011 06:39:11 -0700
Subject: Re: [netext] I-D Action: draft-ietf-netext-logical-interface-support-03.txt
X-Mailman-Version: 2.1.12
Precedence: list
List-Id: "Mailing list for discusion of extensions to network mobility protocol, i.e PMIP6. " <>
List-Unsubscribe: <>, <>
List-Archive: <>
List-Post: <>
List-Help: <>
List-Subscribe: <>, <>
X-List-Received-Date: Tue, 06 Sep 2011 13:34:36 -0000

Hi Sri,

On 09/05/2011 12:15 PM, wrote:
> A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Network-Based Mobility Extensions Working Group of the IETF.
> 	Title           : Logical Interface Support for multi-mode IP Hosts
> 	Author(s)       : Telemaco Melia
>                           Sri Gundavelli
> 	Filename        : draft-ietf-netext-logical-interface-support-03.txt
> 	Pages           : 26
> 	Date            : 2011-09-05

I read this draft and had a comment on Section 6.5:

6.5.  ND Considerations for Logical Interface

   The following are the Neighbor Discovery related considerations for
   the logical interface.

   o  Any Neighbor Discovery messages, such as Router Solicitation,
      Neighbor Solicitation messages that the host sends to a multicast
      destination address of link-local scope such as, all-nodes, all-
      routers, solicited-node multicast group addresses, using either an
      unspecified (::) source address, or a link-local address
      configured on the logical interface will be replicated and
      forwarded on each of the sub-interfaces under that logical
      interface.  However, if the destination address is a unicast
      address and if that target is known to exist on a specific sub-
      interface, the message will be forwarded only on that specific

I'm not sure about other OSes, but since you mentioned the Linux bonding driver
as an example of a Logical interface I can respond regarding that.  There are
configurations where you do NOT want to replicate a packet and forward it on all
the underlying physical interfaces.  Doing so can cause DAD failures if any of
the other interfaces see those packets sent to the all-nodes multicast address.
 We noticed and fixed that back in 2008.

BTW, I'm not subscribed to net-next, so haven't seen any previous discussion on
the draft.