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Re: [Anima] ipv4-only network

Michael Richardson <mcr+ietf@sandelman.ca> Thu, 05 August 2021 16:51 UTC

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From: Michael Richardson <mcr+ietf@sandelman.ca>
To: Liyizhou <liyizhou@huawei.com>, "anima@ietf.org" <anima@ietf.org>
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Date: Thu, 05 Aug 2021 12:51:41 -0400
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Subject: Re: [Anima] ipv4-only network
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Liyizhou <liyizhou@huawei.com> wrote:
    > For example, as ULA and link-local address schemes are not available in
    > ipv4 networks,

This is a false statement.
IPv6 Link-Local addresses are always available without network support.
Our use of ULA occurs in the overlay layer, and is never seen.

So RFC8994 is completely deployable in IPv4-only networks.
If your control plan OS has no IPv6, then I agree there is a problem.
If it were 1999, I might believe that.

    > There might be discussions and thoughts in this aspect in earlier days
    > in the community. I would be very appreciated if anyone can point them
    > out.

Conceivably, you might have an L2 network which is opaque to etherype 0x86DD
then there might be an issue.  Is that really the case?
In which case we could discuss running over IPv4-Link-Local.

--
Michael Richardson <mcr+IETF@sandelman.ca>   . o O ( IPv6 IøT consulting )
           Sandelman Software Works Inc, Ottawa and Worldwide

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