Re: [dhcwg] Question to DHCPv6 Relay Implementors regarding draft-ietf-dhc-dhcpv6-pd-relay-requirements
Alexandre Petrescu <alexandre.petrescu@gmail.com> Wed, 07 October 2020 10:38 UTC
Return-Path: <alexandre.petrescu@gmail.com>
X-Original-To: dhcwg@ietfa.amsl.com
Delivered-To: dhcwg@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5DB523A08B9 for <dhcwg@ietfa.amsl.com>; Wed, 7 Oct 2020 03:38:55 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: 1.458
X-Spam-Level: *
X-Spam-Status: No, score=1.458 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_ADSP_CUSTOM_MED=0.001, FORGED_GMAIL_RCVD=1, FREEMAIL_FROM=0.001, FREEMAIL_REPLY=1, NICE_REPLY_A=-0.213, NML_ADSP_CUSTOM_MED=0.9, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_SOFTFAIL=0.665, URIBL_BLOCKED=0.001] autolearn=no autolearn_force=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 eQ6iQz5mxiaj for <dhcwg@ietfa.amsl.com>; Wed, 7 Oct 2020 03:38:53 -0700 (PDT)
Received: from sainfoin-smtp-out.extra.cea.fr (sainfoin-smtp-out.extra.cea.fr [132.167.192.228]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 8258E3A08B8 for <dhcwg@ietf.org>; Wed, 7 Oct 2020 03:38:53 -0700 (PDT)
Received: from pisaure.intra.cea.fr (pisaure.intra.cea.fr [132.166.88.21]) by sainfoin-sys.extra.cea.fr (8.14.7/8.14.7/CEAnet-Internet-out-4.0) with ESMTP id 097AcpWi031393 for <dhcwg@ietf.org>; Wed, 7 Oct 2020 12:38:51 +0200
Received: from pisaure.intra.cea.fr (localhost [127.0.0.1]) by localhost (Postfix) with SMTP id 934AF204298 for <dhcwg@ietf.org>; Wed, 7 Oct 2020 12:38:51 +0200 (CEST)
Received: from muguet1-smtp-out.intra.cea.fr (muguet1-smtp-out.intra.cea.fr [132.166.192.12]) by pisaure.intra.cea.fr (Postfix) with ESMTP id 8916C20362D for <dhcwg@ietf.org>; Wed, 7 Oct 2020 12:38:51 +0200 (CEST)
Received: from [10.8.35.150] (is154594.intra.cea.fr [10.8.35.150]) by muguet1-sys.intra.cea.fr (8.14.7/8.14.7/CEAnet-Internet-out-4.0) with ESMTP id 097AcpOQ014977 for <dhcwg@ietf.org>; Wed, 7 Oct 2020 12:38:51 +0200
To: dhcwg@ietf.org
References: <5F6947F2-F7DF-4907-8DD5-28C2B20A91DE@gmx.com>
From: Alexandre Petrescu <alexandre.petrescu@gmail.com>
Message-ID: <21b04a09-758c-44ce-2357-10fee16780d2@gmail.com>
Date: Wed, 07 Oct 2020 12:38:51 +0200
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.3.2
MIME-Version: 1.0
In-Reply-To: <5F6947F2-F7DF-4907-8DD5-28C2B20A91DE@gmx.com>
Content-Type: text/plain; charset="utf-8"; format="flowed"
Content-Language: fr
Content-Transfer-Encoding: 8bit
Archived-At: <https://mailarchive.ietf.org/arch/msg/dhcwg/1BkXkGViDU5rjcgJngWyl-gR9Hg>
Subject: Re: [dhcwg] Question to DHCPv6 Relay Implementors regarding draft-ietf-dhc-dhcpv6-pd-relay-requirements
X-BeenThere: dhcwg@ietf.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: <dhcwg.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/dhcwg>, <mailto:dhcwg-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/dhcwg/>
List-Post: <mailto:dhcwg@ietf.org>
List-Help: <mailto:dhcwg-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/dhcwg>, <mailto:dhcwg-request@ietf.org?subject=subscribe>
X-List-Received-Date: Wed, 07 Oct 2020 10:38:55 -0000
There are few things I could comment on here... Le 07/10/2020 à 12:25, ianfarrer@gmx.com a écrit : > Hi, > > We are currently finishing WGLC for this draft. It describes > requirements for a 'DHCPv6 Delegating Relay' - this is a router > functioning as the L3 edge and DHCPv6 relay (only) with prefix > delegation. This is a common deployment scenario, but RFC3633/8415 only > really describes PD using a Delegating Router - i.e the L3 edge also > functions as a DHCPv6 server with no relay. When the relay and server > functions are performed by separate devices a number of problems with > how relays behave have > been observed, so this document addresses them. > > During WGLC for this, Ole raised a comment related to one of the routing > requirements: > > R-4: If the relay has learned a route for a delegated prefix via a > given interface, and receives traffic on this interface with > a destination address within the delegated prefix (that is > not an on-link prefix for the relay), then it MUST be > dropped. 'within' the delegated prefix? How is the operation of finding whether an address is within a prefix implemented? REmember the 64bit limit is not frozen and as such a longest prefix match operation might be the only possible; such an operation is however not offering the result one might expect. Lpm is good for matching an address among a few prefixes, but is not good for deciding whether an address is 'within' a given prefix. 2. there is a new RFC now that suggests addition of an NC entry in router's table such that incoming packets to that Host dont get dropped. Such an operation would contradict R-4. This is to prevent routing loops. An ICMPv6 Type > 1, Code 6 (Destination Unreachable, reject route to > destination) error message MAY be sent back to the client. > The ICMP policy SHOULD be configurable. > > The problem that this is trying to solve is: > > 3.5. Forwarding Loops between Client and Relay > > If the client loses information about a prefix that it is delegated > while the lease entry and associated route is still active in the > delegating relay, then the relay will forward traffic to the client > which the client will return to the relay Will a client return a packet to relay? Or will it generate an ICMP error carrying the packet? (which is the client's > default gateway (learnt via an RA). The loop will continue until > either the client is successfully reprovisioned via DHCP, or the lease > ages out in the relay. I would dare to wonder whether such loop has been seen with a packet capture tool such as wireshark? Or is it that we worry that such a loop might appear? Both are valid points to consider. > Ole’s comment: "And I would also be happy if we could have some > implementors chime in with a "we are happy and able to implement this > requirement”.” > > We would appreciate any feedback on this, especially from anyone with > experience implementing DHCPv6 relays with PD. I do have some experience implementing relays and server doing PD, but it was some years ago. The server was doing PD and the relay just adding a route. I dont remember having seen loops, but I have not tried the scenario described above (expiration of prefix lease). Alex > > Thanks, > Ian > > Current draft version: > https://datatracker.ietf.org/doc/draft-ietf-dhc-dhcpv6-pd-relay-requirements/ > <https://datatracker.ietf.org/doc/draft-ietf-dhc-dhcpv6-pd-relay-requirements/> > > > > _______________________________________________ > dhcwg mailing list > dhcwg@ietf.org > https://www.ietf.org/mailman/listinfo/dhcwg >
- [dhcwg] Question to DHCPv6 Relay Implementors reg… ianfarrer
- Re: [dhcwg] Question to DHCPv6 Relay Implementors… Alexandre Petrescu
- Re: [dhcwg] [EXTERNAL] Question to DHCPv6 Relay I… Templin (US), Fred L
- Re: [dhcwg] [EXTERNAL] Question to DHCPv6 Relay I… otroan
- Re: [dhcwg] [EXTERNAL] Question to DHCPv6 Relay I… Templin (US), Fred L
- Re: [dhcwg] [EXTERNAL] Question to DHCPv6 Relay I… otroan
- Re: [dhcwg] [EXTERNAL] Question to DHCPv6 Relay I… Templin (US), Fred L
- Re: [dhcwg] [EXTERNAL] Question to DHCPv6 Relay I… Templin (US), Fred L
- Re: [dhcwg] [EXTERNAL] Question to DHCPv6 Relay I… Templin (US), Fred L
- Re: [dhcwg] Question to DHCPv6 Relay Implementors… Michael Richardson
- Re: [dhcwg] Question to DHCPv6 Relay Implementors… Jen Linkova
- Re: [dhcwg] Question to DHCPv6 Relay Implementors… ianfarrer
- Re: [dhcwg] Question to DHCPv6 Relay Implementors… Alexandre Petrescu
- Re: [dhcwg] [EXTERNAL] Re: Question to DHCPv6 Rel… Templin (US), Fred L
- Re: [dhcwg] Question to DHCPv6 Relay Implementors… ianfarrer
- Re: [dhcwg] [EXTERNAL] Re: Question to DHCPv6 Rel… ianfarrer
- Re: [dhcwg] Question to DHCPv6 Relay Implementors… Michael Richardson
- Re: [dhcwg] [v6ops] [EXTERNAL] Re: Question to DH… Bernie Volz (volz)
- Re: [dhcwg] [v6ops] [EXTERNAL] Re: Question to DH… Templin (US), Fred L
- Re: [dhcwg] [v6ops] [EXTERNAL] Re: Question to DH… Ole Troan
- Re: [dhcwg] [v6ops] [EXTERNAL] Re: Question to DH… Templin (US), Fred L
- Re: [dhcwg] [v6ops] [EXTERNAL] Re: Question to DH… Templin (US), Fred L
- Re: [dhcwg] [v6ops] [EXTERNAL] Re: Question to DH… Bernie Volz (volz)
- Re: [dhcwg] [v6ops] [EXTERNAL] Re: Question to DH… Jen Linkova
- Re: [dhcwg] [v6ops] [EXTERNAL] Re: Question to DH… Jen Linkova
- Re: [dhcwg] Question to DHCPv6 Relay Implementors… Jen Linkova
- Re: [dhcwg] [v6ops] [EXTERNAL] Re: Question to DH… Bjørn Mork
- Re: [dhcwg] [v6ops] [EXTERNAL] Re: Question to DH… Ole Troan
- Re: [dhcwg] [v6ops] [EXTERNAL] Re: Question to DH… Bjørn Mork
- Re: [dhcwg] [EXTERNAL] Re: Question to DHCPv6 Rel… Jen Linkova
- Re: [dhcwg] Question to DHCPv6 Relay Implementors… ianfarrer
- Re: [dhcwg] [v6ops] [EXTERNAL] Re: Question to DH… Templin (US), Fred L
- Re: [dhcwg] [v6ops] [EXTERNAL] Re: Question to DH… Michael Richardson
- Re: [dhcwg] [v6ops] [EXTERNAL] Re: Question to DH… ianfarrer
- Re: [dhcwg] [v6ops] [EXTERNAL] Re: Question to DH… Bernie Volz (volz)
- Re: [dhcwg] [v6ops] Re: Question to DHCPv6 Relay … Templin (US), Fred L
- Re: [dhcwg] [v6ops] Re: Question to DHCPv6 Relay … ianfarrer
- Re: [dhcwg] [EXTERNAL] Re: [v6ops] Re: Question t… Templin (US), Fred L
- Re: [dhcwg] [v6ops] Re: Question to DHCPv6 Relay … Michael Richardson
- Re: [dhcwg] [EXTERNAL] Re: [v6ops] Re: Question t… Templin (US), Fred L
- Re: [dhcwg] [EXTERNAL] Re: [v6ops] Re: Question t… Ted Lemon
- Re: [dhcwg] [EXTERNAL] Re: [v6ops] Re: Question t… Templin (US), Fred L
- Re: [dhcwg] [EXTERNAL] Re: [v6ops] Re: Question t… Ted Lemon
- Re: [dhcwg] [EXTERNAL] Re: [v6ops] Re: Question t… Templin (US), Fred L
- Re: [dhcwg] [v6ops] Re: Question to DHCPv6 Relay … Philip Homburg
- Re: [dhcwg] [EXTERNAL] Re: [v6ops] Re: Question t… Templin (US), Fred L
- Re: [dhcwg] [EXTERNAL] Re: [v6ops] Re: Question t… Michael Richardson
- Re: [dhcwg] [EXTERNAL] Re: [v6ops] Re: Question t… Templin (US), Fred L
- Re: [dhcwg] [EXTERNAL] [v6ops] Re: Question to DH… Bob Hinden
- Re: [dhcwg] [EXTERNAL] [v6ops] Re: Question to DH… Templin (US), Fred L
- Re: [dhcwg] [EXTERNAL] [v6ops] Re: Question to DH… Bob Hinden
- Re: [dhcwg] [EXTERNAL] [v6ops] Re: Question to DH… Templin (US), Fred L
- Re: [dhcwg] [EXTERNAL] [v6ops] Re: Question to DH… Bob Hinden
- Re: [dhcwg] [EXTERNAL] Re: [v6ops] Re: Question t… Michael Richardson
- Re: [dhcwg] [EXTERNAL] [v6ops] Re: Question to DH… Michael Richardson
- [dhcwg] how do routers with DHCPv6 relays learn w… Michael Richardson
- Re: [dhcwg] [EXTERNAL] [v6ops] Re: Question to DH… Bob Hinden
- Re: [dhcwg] [v6ops] [EXTERNAL] Re: Question to DH… Jen Linkova
- Re: [dhcwg] [v6ops] [EXTERNAL] Re: Question to DH… Jen Linkova
- Re: [dhcwg] [v6ops] [EXTERNAL] Re: Question to DH… Bernie Volz (volz)
- Re: [dhcwg] [EXTERNAL] Re: [v6ops] Re: Question t… Templin (US), Fred L
- Re: [dhcwg] [v6ops] Re: Question to DHCPv6 Relay … Templin (US), Fred L
- Re: [dhcwg] [v6ops] Re: Question to DHCPv6 Relay … Templin (US), Fred L
- Re: [dhcwg] [v6ops] Re: Question to DHCPv6 Relay … otroan
- Re: [dhcwg] [v6ops] Re: Question to DHCPv6 Relay … Timothy Winters
- Re: [dhcwg] [v6ops] Re: Question to DHCPv6 Relay … Ted Lemon
- Re: [dhcwg] [EXTERNAL] Re: [v6ops] Re: Question t… Templin (US), Fred L
- Re: [dhcwg] [EXTERNAL] Re: [v6ops] Re: Question t… Ms. Li HUANG
- Re: [dhcwg] [v6ops] [EXTERNAL] Re: Question to DH… ianfarrer
- Re: [dhcwg] [v6ops] [EXTERNAL] Re: Question to DH… Michael Richardson
- Re: [dhcwg] [v6ops] [EXTERNAL] Re: Question to DH… ianfarrer
- Re: [dhcwg] [v6ops] [EXTERNAL] Re: Question to DH… Michael Richardson
- Re: [dhcwg] [v6ops] [EXTERNAL] Re: Question to DH… Jen Linkova
- Re: [dhcwg] [v6ops] [EXTERNAL] Re: Question to DH… Bernie Volz (volz)
- Re: [dhcwg] [v6ops] [EXTERNAL] Re: Question to DH… Timothy Winters
- Re: [dhcwg] [v6ops] [EXTERNAL] Re: Question to DH… Bernie Volz (volz)
- Re: [dhcwg] [v6ops] [EXTERNAL] Re: Question to DH… ianfarrer
- Re: [dhcwg] [v6ops] [EXTERNAL] Re: Question to DH… ianfarrer