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Re: [v6ops] draft-buraglio-v6ops-ula discussion

Brian E Carpenter <brian.e.carpenter@gmail.com> Fri, 05 August 2022 20:58 UTC

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Date: Sat, 06 Aug 2022 08:58:20 +1200
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From: Brian E Carpenter <brian.e.carpenter@gmail.com>
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Subject: Re: [v6ops] draft-buraglio-v6ops-ula discussion
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On 06-Aug-22 04:08, David Farmer wrote:
> 
> On Fri, Aug 5, 2022 at 4:45 AM Eric Vyncke (evyncke) <evyncke=40cisco.com@dmarc.ietf.org <mailto:40cisco.com@dmarc.ietf.org>> wrote
> 
>     This may be an unexpected behavior, but I still prefer using global IPv4 addresses (not RFC 1918) rather than ULA. The I-D should cover this.
> 
> 
> Currently, the RFC6724 default table doesn't distinguish between global IPv4 addresses and local RFC1918 IPv4 addresses. They are treated the same. They are both part of the same entry (::ffff:0:0/96         35     4). However, the default table does distinguish between global IPv6 addresses and ULA IPv6 addresses. So are you suggesting the default table needs to distinguish global IPv4 addresses and local RFC1918 IPv4 addresses?

I can't imagine why an IPv6 RFC would try to change the behaviour of IPv4 address selection, or whether current operating system kernels would even know what to do with the resulting precedences. I'm not sure that there's any code to support this.

     Brian

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