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Fri, 02 Apr 2021 21:30:41 -0700 (PDT) Received: from rimwks.local ([2001:470:1f15:3d8:7285:c2ff:fe37:5722]) by smtp.gmail.com with ESMTPSA id c14sm1038957lfp.269.2021.04.02.21.30.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 02 Apr 2021 21:30:41 -0700 (PDT) From: Rozhuk Ivan X-Google-Original-From: Rozhuk Ivan Date: Sat, 3 Apr 2021 07:30:39 +0300 To: Abelenda Diego Cc: freebsd-net@freebsd.org Subject: Re: Multicast issue, interface not leaving Mutlicast Group Message-ID: <20210403073039.5a58fed3@rimwks.local> In-Reply-To: <20200807152525.711d4072@debian> References: <20200807152525.711d4072@debian> X-Mailer: Claws Mail 3.17.8 (GTK+ 2.24.33; amd64-portbld-freebsd13.0) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 4FC3rN0lx0z4tL6 X-Spamd-Bar: ---- Authentication-Results: mx1.freebsd.org; dkim=pass header.d=gmail.com header.s=20161025 header.b=t1fGZR66; dmarc=pass (policy=none) header.from=gmail.com; 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SPAMHAUS_ZRD(0.00)[2a00:1450:4864:20::12e:from:127.0.2.255]; TO_MATCH_ENVRCPT_SOME(0.00)[]; RCVD_IN_DNSWL_NONE(0.00)[2a00:1450:4864:20::12e:from]; RCVD_TLS_ALL(0.00)[]; MAILMAN_DEST(0.00)[freebsd-net] X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 03 Apr 2021 04:30:44 -0000 On Fri, 7 Aug 2020 15:25:25 +0200 Abelenda Diego wrote: > Hello, > > I have discovered that I had a multicast issue for years I did not > know about. I use a FreeBSD (opnsense) setup as router for my home > network and have igmpproxy for IPTV. Somehow everything seems to > work, until I realized that my ISP was making a DoS with multicast. > It is pretty much what was described years ago here: > https://forum.netgate.com/topic/62591/igmp-issues-causing-isp-to-perform-multicast-dos-on-my-pfsense/7. > But the solution of not using FreeBSD seem weird. So dug a lot > learning about Multicast IGMPv{2,3} etc in the process. Here is an > abstract of what I found: > > > igmpproxy is performing "correctly" in that it will act upon to > IGMPv2 Join request from the TV box by joining the multicast groups > correctly. When the TV Box sends an IGMPv2 Leave request, igmpproxy > will remove the source IP from the multicast table on the interface > (the code is here > https://github.com/pali/igmpproxy/blob/b7940fc75b36d5bcc3a07654fc1af76f179302a9/src/mcgroup.c#L58-L60 > this same call is used for joining and leaving). > You can drop all this and just forward (bridge) all multicast: http://netlab.dhis.org/wiki/ru:software:freebsd:igmpproxy_on_netgraph https://lists.freebsd.org/pipermail/freebsd-net/2011-December/030643.html