Date: Sun, 09 Aug 2020 13:55:02 +0000 From: "Bjoern A. Zeeb" <bzeeb-lists@lists.zabbadoz.net> To: "Abelenda Diego" <diego.abelenda@gmail.com> Cc: freebsd-net@freebsd.org Subject: Re: Multicast issue, interface not leaving Mutlicast Group Message-ID: <BD1DD220-3A77-4187-9C19-33DB53DEFFEE@lists.zabbadoz.net> In-Reply-To: <20200808143106.423bd20f@debian> References: <20200807152525.711d4072@debian> <9c241a38-977b-dcdd-ba5d-e8b2dfa2b17c@selasky.org> <20200808143106.423bd20f@debian>
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On 8 Aug 2020, at 12:31, Abelenda Diego wrote: > On Sat, 8 Aug 2020 12:54:37 +0200 > Hans Petter Selasky <hps@selasky.org> wrote: > >> On 2020-08-07 15:25, 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-perf= orm-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: >> >> Which version of FreeBSD is this (uname -a) ? >> >> There has been some fixes in the multicast area from time to time, = >> and >> you should make sure you've got all the fixes incorporated in the = >> kernel >> you are using, typically by testing a kernel based on a -stable or >> -current branch of FreeBSD. >> >> --HPS >> > > Hello, > > This is opnsense, so it is not like I can change kernel as I want. = > Moreover the > kernel used by opnsense has some patches for stf 6rd support for = > example, > things like that. > > Anyway, the kernel I use is: > > FreeBSD $hostname 12.1-RELEASE-p7-HBSD FreeBSD 12.1-RELEASE-p7-HBSD #0 = > 427d53bc125(stable/20.7)-dirty: Sun Jul 26 05:51:42 CEST 2020 = > root@sensey64:/usr/obj/usr/src/amd64.amd64/sys/SMP amd64 > > But from what you are asking, it seems you suggest my issue is kernel = > related > and in no way a userspace problem. So I cannot do anything to mitigate = > the > issue? > > BTW I said reset the interface fixed the issue, but in fact, I need to = > reboot, > I found no way to clear the multicast group memberships. Is this related to: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D248512 and the there= = referenced other bugs? /bz
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