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Date:      Wed, 13 Nov 2024 21:25:16 +0000 (UTC)
From:      "Bjoern A. Zeeb" <bz@freebsd.org>
To:        Ed Maste <emaste@freebsd.org>
Cc:        "src-committers@freebsd.org" <src-committers@freebsd.org>,  "dev-commits-src-all@freebsd.org" <dev-commits-src-all@freebsd.org>,  "dev-commits-src-main@freebsd.org" <dev-commits-src-main@freebsd.org>
Subject:   Re: git: 9e469437993b - main - inet.4: drop "experimetal use" from net0 and net240 descriptions
Message-ID:  <92rrs9s2-0846-ppno-o673-69np1773qq40@serrofq.bet>
In-Reply-To: <CAPyFy2CjdqAeuG=n6FsrMgqYzjkuuEnSRL0nFSpFcFF1RKnQbQ@mail.gmail.com>
References:  <202411111247.4ABClC6l042813@gitrepo.freebsd.org> <46spnoss-r0s0-92o3-60r7-r2o49ro82580@SerrOFQ.bet> <333D66C8-12BC-43CD-B33B-B410B8B3BC22@FreeBSD.org> <CAPyFy2CjdqAeuG=n6FsrMgqYzjkuuEnSRL0nFSpFcFF1RKnQbQ@mail.gmail.com>

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On Wed, 13 Nov 2024, Ed Maste wrote:

> On Tue, 12 Nov 2024 at 08:56, Zhenlei Huang <zlei@freebsd.org> wrote:
>>
>> Emm, while I was reviewing this change, I also wondered if it is too early to remove the word *experimental* as the RFC is still in draft status. Well later I think ( maybe I'm wrong ) RFC actually lag behind the reality ( I'm saying FreeBSD as a vendor and move fast action ) so I think it is OK to remove now.
>
> My argument for the man page update was that the sysctl controls use
> of those addresses, regardless of purpose. Note that the sysctl
> description captures this subtle distinction already:
>
> net.inet.ip.allow_net240: Allow use of Experimental addresses, aka
> Class E (240/4)
>
> That is, it's "... use of Experimental addresses ..." not "...
> experimental use of ..."
>
> Unfortunately it's a bit more of a mess than that. Most operating
> systems are allowing 240/4 by default and as it turns out we
> (unintentionally?) also allow configuring 240/4 the host's IPv4
> address already. This sysctl actually controls only forwarding, and
> we'll need to update anyway. I'm inclined to indicate in the man page
> that these sysctls control forwarding, and add a note along the lines
> of "at time of writing this region is reserved."

Sounds good to me.  Thank you!

/bz

-- 
Bjoern A. Zeeb                                                     r15:7



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