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<div class="moz-cite-prefix">On 28/07/2023 22:03, Dan Oachs wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAE4qXG_c0sB_YvzrVgidSN3b3akUYGwdRopcVBJtsaQd563C_Q@mail.gmail.com">
<div class="gmail_default" style="font-size:small">I'm a little
confused about what you are trying to do. What don't you like
about the way it is working now?</div>
</blockquote>
<p>I want to make this a pure IPv6-only network (not dual-stack),
which means:</p>
<p>- not offering any IPv4 address to clients which don't support
RFC 8925 (which means detecting whether they request option 108,
and not responding to clients which don't)<br>
</p>
<p>- more correctly following RFC 8925 by returning 0.0.0.0 in the
offer (which would also allow me to support RFC 2563)<br>
</p>
<p>- not having to worry about IPv4 pool exhaustion<br>
</p>
<p>I *could* simply not run any DHCPv4 service at all, but macOS
doesn't activate its CLAT unless it gets an RFC 8925 DHCPv4
response.</p>
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