Re: on-link and off-link

"Wes Beebee (wbeebee)" <wbeebee@cisco.com> Mon, 12 July 2021 19:33 UTC

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From: "Wes Beebee (wbeebee)" <wbeebee@cisco.com>
To: Vasilenko Eduard <vasilenko.eduard@huawei.com>, Philip Homburg <pch-ipv6-ietf-7@u-1.phicoh.com>, "ipv6@ietf.org" <ipv6@ietf.org>
CC: Alexandre Petrescu <alexandre.petrescu@gmail.com>
Subject: Re: on-link and off-link
Thread-Topic: on-link and off-link
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Date: Mon, 12 Jul 2021 19:33:11 +0000
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I agree that NS(DAD) for LLA has to be handled with care - and that's what we did with our NBMA link that's been working fine for tens of millions (probably hundreds of millions by now) of people for the past decade, which supports IPv6 fine by the way.  And yes, we implemented IPv6 multicast on that link too - everything has to be controlled by the hub site (think really big specialized hardware router) on an NBMA link, which is true for IPv4 as well.

- Wes

On 7/12/21, 11:41 AM, "ipv6 on behalf of Vasilenko Eduard" <ipv6-bounces@ietf.org on behalf of vasilenko.eduard@huawei.com> wrote:

    NBMA or P2MP are not supported by IPv6 anyway because it is not possible to check LLA uniqueness - multicast does not work.
    LLA proxy is needed on the hub site.
    Ed/
    -----Original Message-----
    From: ipv6 [mailto:ipv6-bounces@ietf.org] On Behalf Of Philip Homburg
    Sent: Monday, July 12, 2021 6:20 PM
    To: ipv6@ietf.org
    Cc: Alexandre Petrescu <alexandre.petrescu@gmail.com>
    Subject: Re: on-link and off-link 

    > I think one question
    > might be: do we agree that each IP address is assigned on an 
    > interface, and thus is on-link on a particular link?

    This is not correct. On a NBMA link it is possible that all GUA addresses are not on-link.

    The conceptual model of on-link is that a host can use neighbor discovery to find an onlink neighbor. If the neighbor is not on-link then traffic has to go (at least initially) through a default router.

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