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[204.195.22.127]) by smtp.gmail.com with ESMTPSA id t126sm4081pfb.29.2020.04.20.09.43.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 20 Apr 2020 09:43:54 -0700 (PDT) Date: Mon, 20 Apr 2020 09:43:51 -0700 From: Stephen Hemminger To: roucaries.bastien@gmail.com Cc: netdev@vger.kernel.org, sergei.shtylyov@cogentembedded.com, Bastien =?UTF-8?B?Um91Y2FyacOocw==?= Subject: Re: [PATCH 1/6] Better documentation of mcast_to_unicast option Message-ID: <20200420094351.0fadab71@hermes.lan> In-Reply-To: <20200412235038.377692-2-rouca@debian.org> References: <20200405134859.57232-1-rouca@debian.org> <20200412235038.377692-1-rouca@debian.org> <20200412235038.377692-2-rouca@debian.org> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org On Mon, 13 Apr 2020 01:50:33 +0200 roucaries.bastien@gmail.com wrote: > +.BR mcast_to_unicast > +works on top of the multicast snooping feature of > +the bridge. Which means unicast copies are only delivered to hosts which > +are interested in it and signalized this via IGMP/MLD reports > +previously. > + > +This feature is intended for interface types which have a more reliable > +and/or efficient way to deliver unicast packets than broadcast ones > +(e.g. WiFi). > + > +However, it should only be enabled on interfaces where no IGMPv2/MLDv1 > +report suppression takes place. IGMP/MLD report suppression issue is usually > +overcome by the network daemon (supplicant) enabling AP isolation and > +by that separating all STAs. > + > +Delivery of STA-to-STA IP mulitcast is made possible again by > +enabling and utilizing the bridge hairpin mode, which considers the > +incoming port as a potential outgoing port, too (see > +.B hairpin > +option). It probably doesn't make difference but seems like inconsistent usage of Bold and BoldRoman macros .B mcast_to_unicast works on top of the multicast snooping feature of .BR hairpin "option)."