From owner-freebsd-net@freebsd.org Tue Jul 7 11:48:32 2020 Return-Path: Delivered-To: freebsd-net@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id CC5AA35F133 for ; Tue, 7 Jul 2020 11:48:32 +0000 (UTC) (envelope-from hps@selasky.org) Received: from mail.turbocat.net (turbocat.net [88.99.82.50]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 4B1LL74s18z4SwY for ; Tue, 7 Jul 2020 11:48:31 +0000 (UTC) (envelope-from hps@selasky.org) Received: from hps2020.home.selasky.org (unknown [178.17.145.105]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by mail.turbocat.net (Postfix) with ESMTPSA id A8EF6260072; Tue, 7 Jul 2020 13:48:29 +0200 (CEST) Subject: Re: Multicast: membership to (*, G) group after leaving a (S, G) group To: Fabrice Colliot , freebsd-net@freebsd.org References: From: Hans Petter Selasky Message-ID: <2516812c-667c-d24a-d100-aea0f7e60b69@selasky.org> Date: Tue, 7 Jul 2020 13:48:07 +0200 User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:68.0) Gecko/20100101 Thunderbird/68.8.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 4B1LL74s18z4SwY X-Spamd-Bar: -- Authentication-Results: mx1.freebsd.org; dkim=none; dmarc=none; spf=pass (mx1.freebsd.org: domain of hps@selasky.org designates 88.99.82.50 as permitted sender) smtp.mailfrom=hps@selasky.org X-Spamd-Result: default: False [-2.77 / 15.00]; RCVD_VIA_SMTP_AUTH(0.00)[]; ARC_NA(0.00)[]; MID_RHS_MATCH_FROM(0.00)[]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; R_SPF_ALLOW(-0.20)[+a:mail.turbocat.net]; NEURAL_HAM_LONG(-1.02)[-1.021]; TAGGED_RCPT(0.00)[]; MIME_GOOD(-0.10)[text/plain]; DMARC_NA(0.00)[selasky.org]; TO_MATCH_ENVRCPT_SOME(0.00)[]; NEURAL_HAM_SHORT(-0.51)[-0.515]; RCPT_COUNT_TWO(0.00)[2]; NEURAL_HAM_MEDIUM(-0.93)[-0.935]; FREEMAIL_TO(0.00)[gmail.com,freebsd.org]; FROM_EQ_ENVFROM(0.00)[]; R_DKIM_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; RCVD_COUNT_TWO(0.00)[2]; ASN(0.00)[asn:24940, ipnet:88.99.0.0/16, country:DE]; RCVD_TLS_ALL(0.00)[] X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.33 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 07 Jul 2020 11:48:32 -0000 On 2020-07-07 12:01, Fabrice Colliot wrote: > Hi, > > I'm using smcroute to join and leave multicast groups and I don't > understand the behavior of FreeBSD when the group is left. > > Here is what I do: > > smcroute join em1 10.3.4.5 224.0.55.55 > ifmcstat -i em1 > em1: > inet 10.10.0.1 > igmpv3 rv 2 qi 125 qri 10 uri 3 > group 224.0.55.55 mode include > mcast-macaddr 01:00:5e:00:37:37 > group 224.0.0.1 mode exclude > mcast-macaddr 01:00:5e:00:00:01 > > smcroute leave em1 10.3.4.5 224.0.55.55 > ifmcstat -i em1 > em1: > inet 10.10.0.1 > igmpv3 rv 2 qi 125 qri 10 uri 3 > group 224.0.55.55 mode undefined > mcast-macaddr 01:00:5e:00:37:37 > group 224.0.0.1 mode exclude > mcast-macaddr 01:00:5e:00:00:01 > > At this point, I expected to have no membership left on em1 for 224.0.55.55 > but ifmcstat shows that the interface is still a member of the group but in > undefined mode. > > I was wondering if anybody could tell me why the group membership seems to > be transitioned to a (*, G) membership when all the (S, G) memberships are > removed. > Which version of FreeBSD is this? --HPS