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[2001:7d0:8327:fe80:2de:83c6:c174:8637]) by smtp.gmail.com with ESMTPSA id 23sm48570lff.91.2020.06.29.10.01.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 29 Jun 2020 10:01:52 -0700 (PDT) Message-ID: <910f09eb8b67bef5cc55114fe1b0bd6297ea2ec4.camel@gmail.com> Subject: Re: Standardized IPv6 ULA from PublicKey From: Arti Zirk To: Toke =?ISO-8859-1?Q?H=F8iland-J=F8rgensen?= , Roman Mamedov Cc: Reid Rankin , ch@ntrv.dk, WireGuard mailing list Date: Mon, 29 Jun 2020 20:01:51 +0300 In-Reply-To: <87lfk6gjax.fsf@toke.dk> References: <372AE79B-69E5-4B18-926C-E402FDFB2E95@lonnie.abelbeck.com> <20171205035352.01ffe1f5@vega.skynet.aixah.de> <20200624153706.3yngzzslepqh7q54@ws.flokli.de> <875zbai32e.fsf@toke.dk> <20200629153118.4d72f447@natsu> <87r1tygmlv.fsf@toke.dk> <20200629163851.41d6d755@natsu> <87lfk6gjax.fsf@toke.dk> Content-Type: text/plain; charset="UTF-8" User-Agent: Evolution 3.36.3 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-BeenThere: wireguard@lists.zx2c4.com X-Mailman-Version: 2.1.30rc1 Precedence: list List-Id: Development discussion of WireGuard List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: wireguard-bounces@lists.zx2c4.com Sender: "WireGuard" On E, 2020-06-29 at 14:15 +0200, Toke Høiland-Jørgensen wrote: > In general I'd say that deviating from the RFC needs a good reason. > Expanding the number of bits we can use for the identifier may be a > good reason to expand the LL interface ID width (although I'm not > actually too worried about collisions even if we only use 64 bits). Few more counter arguments against expanding identifier length: 1. There is a rejected errata 4406 that wants to do this https://www.rfc-editor.org/errata/eid4406 2. FreeBSD and probably other *BSD/macOS use those unused 56 bits to store the link scope_id. And support nonstandard fe80:1::30/64 notation instead of fe80::30%1/64 to specify the scope. https://stackoverflow.com/a/5891805/2303328 https://github.com/freebsd/freebsd/blob/76f9308e3e2b80e95630efcdd994f3c133806bf4/share/doc/IPv6/IMPLEMENTATION#L427 https://github.com/freebsd/freebsd/blob/e9a39e0c3c22543812afd4de74d1d0ad6782100b/sys/netinet6/scope6.c#L363