IETF Logo Mail Archive

Re: [v6ops] IPv6 link-local traffic questions

Brian E Carpenter <brian.e.carpenter@gmail.com> Wed, 25 March 2020 20:21 UTC

Return-Path: <brian.e.carpenter@gmail.com>
X-Original-To: ipv6@ietfa.amsl.com
Delivered-To: ipv6@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 408293A0C9A; Wed, 25 Mar 2020 13:21:48 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -2.099
X-Spam-Level:
X-Spam-Status: No, score=-2.099 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no
Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com
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 nY_fbza1w7kz; Wed, 25 Mar 2020 13:21:47 -0700 (PDT)
Received: from mail-pg1-x52d.google.com (mail-pg1-x52d.google.com [IPv6:2607:f8b0:4864:20::52d]) (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 D6B373A0C3C; Wed, 25 Mar 2020 13:21:46 -0700 (PDT)
Received: by mail-pg1-x52d.google.com with SMTP id 7so1716465pgr.2; Wed, 25 Mar 2020 13:21:46 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=vlMtrnE6Z9MGqISbbdGtw5XR5PDI/1ieIaj6YYtk2uQ=; b=GtlV7ylLyjHjDRWLO8a12qwyOnyGGRX9pwwfk7BAs8T0r+eV88YovRmphB9+o0q7NF MvudBn08ijjVVMOOSSxvsWLfWjcPeYJp9kdk6AOjUs4BAvzO3g0ImQ3/jbfCwZ6s9sav 2LEBYGAVYl3SuRwTzbmvAKNMhr07aVJDGfdBcS3rOeIZR5uMxD9TwUT8uGFByq0h+6rE GrlVxnIZkLDOuK7Py/5bcK1ubc0QHsvDmxSCpy0Tv4iPuZ13VhoX4fR3/r68BqT5QPJf QBblEjb1sIVrjT4o4u+SFN2TTvgxvAJnOIBly8KvjwhEX5KhKW5Jb78T7dq5FGlWQASY qYIw==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=vlMtrnE6Z9MGqISbbdGtw5XR5PDI/1ieIaj6YYtk2uQ=; b=SfCf2PIJ+VxN77Hf66xgVaum06FFzCMPpR1lOGXAjZBZCSFZFH++j6+/XCHotbmpO9 eKnZ/nKu7dPRJ8y7lRRZpKk5A6QfJKr5HM++H5nhSlss21iIdpHbUI1RP8gc3cxRZdp4 YO9nxVbIgFAWzbFePt2lb3rRupNym+Q02U1D+hGfziXLC4f2YyyHbMCH98ndXvvosVU5 mVv6b+ddD/Eli/6DFGt6w/GnokXjF1Mpc3wNieEkbXqmRev7ELKtj7tnxz7XqAd7Hec4 bY13tA91dbLhe2ABxxJnPZWSIEamwqrt2Oq8Ut185/JccxLTRIf5+WVMqA/sDdAqmwsy VfaQ==
X-Gm-Message-State: ANhLgQ0pGt0bJP+p2V/N0Ylm5BFb4c9zrxy9vQkSfBzLWHZkL1R34cnH YbbKP5GXQTdfw2z9Gk9dWjiTAgms
X-Google-Smtp-Source: ADFU+vtwTmMjcG9Lxb6iQHALfRgkMYaOQNvBGpcIUrjDvapFJ3zQCJKtDjfqUva3WnZ5QPRLhKcopw==
X-Received: by 2002:a65:64cb:: with SMTP id t11mr3442870pgv.62.1585167705786; Wed, 25 Mar 2020 13:21:45 -0700 (PDT)
Received: from [192.168.178.30] ([165.84.25.143]) by smtp.gmail.com with ESMTPSA id o128sm9255pfg.5.2020.03.25.13.21.42 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 25 Mar 2020 13:21:45 -0700 (PDT)
Subject: Re: [v6ops] IPv6 link-local traffic questions
To: Gert Doering <gert@space.net>
Cc: Owen DeLong <owen@delong.com>, Erik Kline <ek.ietf@gmail.com>, V6 Ops List <v6ops@ietf.org>, 6man <6man@ietf.org>
References: <CAFU7BAT-LP5TC9dpYw+5j8T8H_8XMF=tcY-Qsbg5=MOgUYNk+A@mail.gmail.com> <CABNhwV1uCFHCO9r3NK7QeqZ4gvrquoD_534LXoykaf59S48rpA@mail.gmail.com> <1584173474.2857.102.camel@biplane.com.au> <CABNhwV3VCPmcaGNyf=9dX4vcrsSreRGgkRDh0zQD+VLqG-g63Q@mail.gmail.com> <CABNhwV0D71380ZPWTLHu-LM=sz1OK6aB0du=g7uW-gxLdfGvsg@mail.gmail.com> <CA+wi2hMPk6init=1Q1+S0SzTCzOqSDbMNpsD4rUBB0VEo1BkfA@mail.gmail.com> <CABNhwV3Z=YPvU3=X4WOxF1+JRBMovucOdVDa67g1Tv4Yo7+G+A@mail.gmail.com> <CAMGpriVoOufyFhn8tzYvO5S3jJ5=eJz324=3jPJQmK1MiyPQ2g@mail.gmail.com> <5D374DA6-15B2-47AD-97B4-2BCC120859D1@delong.com> <b34e19a1-0ae4-b419-b7df-2c4a893ac9a3@gmail.com> <20200325064855.GD50230@Space.Net>
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Message-ID: <55e4ba5d-f7cc-4fc2-dc20-3ac0fd36d46c@gmail.com>
Date: Thu, 26 Mar 2020 09:21:40 +1300
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.9.1
MIME-Version: 1.0
In-Reply-To: <20200325064855.GD50230@Space.Net>
Content-Type: text/plain; charset="utf-8"
Content-Language: en-US
Content-Transfer-Encoding: 7bit
Archived-At: <https://mailarchive.ietf.org/arch/msg/ipv6/MpjMBBRBBqV8ZYnSqJ3HpGhDuik>
X-BeenThere: ipv6@ietf.org
X-Mailman-Version: 2.1.29
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: <https://mailarchive.ietf.org/arch/browse/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: Wed, 25 Mar 2020 20:21:49 -0000

On 25-Mar-20 19:48, Gert Doering wrote:
> Hi,
> 
> On Wed, Mar 25, 2020 at 03:03:45PM +1300, Brian E Carpenter wrote:
>> Only if the router violates the spec:
>> "  Routers must not forward any packets with Link-Local source or
>>    destination addresses to other links." [RFC4291]
>> Do we have any evidence of routers that are broken in this way?
> 
> Yes.  Last time we checked, Juniper routers just forward(ed) packets based
> on destination address, period.

I'm curious. Since link-local addresses are, er, link-local, how would
such a router choose the outgoing interface?

   Brian

> 
> (This was a few years ago, when trying to figure out what to do against
> the then-current resource attacks against IOS XR LPTS with "too many ND
> packets", so it might have changed in the meantime)
> 
> Gert Doering
>         -- NetMaster
>

v2.23.0 | Report a Bug | By Email