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Date:      Sat, 8 Aug 2020 14:31:06 +0200
From:      Abelenda Diego <diego.abelenda@gmail.com>
To:        Hans Petter Selasky <hps@selasky.org>
Cc:        freebsd-net@freebsd.org
Subject:   Re: Multicast issue, interface not leaving Mutlicast Group
Message-ID:  <20200808143106.423bd20f@debian>
In-Reply-To: <9c241a38-977b-dcdd-ba5d-e8b2dfa2b17c@selasky.org>
References:  <20200807152525.711d4072@debian> <9c241a38-977b-dcdd-ba5d-e8b2dfa2b17c@selasky.org>

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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,
> >=20
> > 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 a=
nd
> > have igmpproxy for IPTV. Somehow everything seems to work, until I real=
ized
> > 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-perfor=
m-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 w=
hat
> > I found:=20
>=20
> Which version of FreeBSD is this (uname -a) ?
>=20
> There has been some fixes in the multicast area from time to time, and=20
> you should make sure you've got all the fixes incorporated in the kernel=
=20
> you are using, typically by testing a kernel based on a -stable or=20
> -current branch of FreeBSD.
>=20
> --HPS
>=20

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  427=
d53bc125(stable/20.7)-dirty: Sun Jul 26 05:51:42 CEST 2020     root@sensey6=
4:/usr/obj/usr/src/amd64.amd64/sys/SMP  amd64

But from what you are asking, it seems you suggest my issue is kernel relat=
ed
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 rebo=
ot,
I found no way to clear the multicast group memberships.

Best regards,
Diego Abelenda

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