RFC4861 question - short prefixes in PIOs

"Templin (US), Fred L" <Fred.L.Templin@boeing.com> Wed, 26 June 2019 15:56 UTC

Return-Path: <Fred.L.Templin@boeing.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 0A99D1202E5; Wed, 26 Jun 2019 08:56:52 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -4.199
X-Spam-Level:
X-Spam-Status: No, score=-4.199 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=0.001, SPF_PASS=-0.001] autolearn=ham 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 nyn-_MWiIc65; Wed, 26 Jun 2019 08:56:50 -0700 (PDT)
Received: from clt-mbsout-02.mbs.boeing.net (clt-mbsout-02.mbs.boeing.net [130.76.144.163]) (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 CF0D112003E; Wed, 26 Jun 2019 08:56:49 -0700 (PDT)
Received: from localhost (localhost [127.0.0.1]) by clt-mbsout-02.mbs.boeing.net (8.14.4/8.14.4/DOWNSTREAM_MBSOUT) with SMTP id x5QFukvV004332; Wed, 26 Jun 2019 11:56:47 -0400
Received: from XCH16-07-11.nos.boeing.com (xch16-07-11.nos.boeing.com [144.115.66.113]) by clt-mbsout-02.mbs.boeing.net (8.14.4/8.14.4/UPSTREAM_MBSOUT) with ESMTP id x5QFubVf002744 (version=TLSv1/SSLv3 cipher=ECDHE-RSA-AES256-SHA384 bits=256 verify=FAIL); Wed, 26 Jun 2019 11:56:37 -0400
Received: from XCH16-07-10.nos.boeing.com (144.115.66.112) by XCH16-07-11.nos.boeing.com (144.115.66.113) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384) id 15.1.1713.5; Wed, 26 Jun 2019 08:56:36 -0700
Received: from XCH16-07-10.nos.boeing.com ([fe80::1522:f068:5766:53b5]) by XCH16-07-10.nos.boeing.com ([fe80::1522:f068:5766:53b5%2]) with mapi id 15.01.1713.004; Wed, 26 Jun 2019 08:56:36 -0700
From: "Templin (US), Fred L" <Fred.L.Templin@boeing.com>
To: v6ops list <v6ops@ietf.org>, 6man <6man@ietf.org>
Subject: RFC4861 question - short prefixes in PIOs
Thread-Topic: RFC4861 question - short prefixes in PIOs
Thread-Index: AdUsMmrDTybnqCimSw+vUa2pQYzWEw==
Date: Wed, 26 Jun 2019 15:56:36 +0000
Message-ID: <729f46ec4a8b419797e15bbdcac3e549@boeing.com>
Accept-Language: en-US
Content-Language: en-US
X-MS-Has-Attach:
X-MS-TNEF-Correlator:
x-originating-ip: [137.137.12.6]
x-tm-snts-smtp: 2598C4F5B3DB5AF477AE552F0AC5A0B28F03625FB207A311AF2C3C05EBB6168A2000:8
Content-Type: multipart/alternative; boundary="_000_729f46ec4a8b419797e15bbdcac3e549boeingcom_"
MIME-Version: 1.0
X-TM-AS-GCONF: 00
Archived-At: <https://mailarchive.ietf.org/arch/msg/ipv6/cikheAdfXOScUHlXyg4JhEoBnLw>
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, 26 Jun 2019 15:56:52 -0000

I have an RFC4861 question (several actually) on short prefixes in RA PIOs:



1) If a PIO includes a prefix with length less than 64 (e.g., 2001:db8::/32) and with L=1, does it

mean that 2001:db8::/32 should be added to the interface prefix list?



2) If yes to 1), does it mean that packets forwarded to the interface for any destination covered

by 2001:db8::/32 will trigger Address Resolution instead of forwarding to a default router?



3) If the PIO instead has L=0, does it mean that 2001:db8::/32 is “associated” with the link but

not necessarily “on-link”?



4) If yes to 3), does it mean that 2001:db8::/32 should be added to the IPv6 forwarding table

as a “route-to-interface” with the receiving interface as the next hop?



5) Does A=1 have any meaning for prefixes with length less than 64? Or, must prefixes with

length less than 64 set A=0?



Thanks - Fred