Date: Sat, 25 Jul 2009 16:11:38 +0200 From: iprebeg@freebsd.org To: freebsd-net@freebsd.org Subject: Re: Wrong multicast destination IP Message-ID: <20090725141138.GA3370@valeria.zesoi.fer.hr> In-Reply-To: <20090725130424.GA24589@valeria.zesoi.fer.hr> References: <20090725130424.GA24589@valeria.zesoi.fer.hr>
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On Sat, Jul 25, 2009 at 03:04:24PM +0200, iprebeg@freebsd.org wrote:
>
> In recent current kernel, it appears that IGMPv2 reports (not IGMPv3)
> are sent to wrong multicast address. I'm trying to setup mcast routing
> in this way:
>
> .--. .--. .--.
> |c1|-10.0.1.2---10.0.1.1-|mr|-10.0.2.1---10.0.2.2-|c2|
> '--' em0 em0 '--' em2 em0 '--'
>
> (em1 is used for SSH access)
>
> mrouted is started on mr with configuration containing only one line:
>
> >phyint em1 disable
>
> and route is created:
>
> >route add 224/24 -iface em0
>
> Machine c1 issues command
>
> >mcastread -v4 -s 10.0.2.2 em0 235.0.0.1 1337
>
> and machine c2 has route
>
> >route add 224/24 -iface em0
>
> and issuse command
>
> >mcastsend 235.0.0.1 1337
>
> mr uses p4 kernel dating 24th of June and cX's use BETA2.
>
> So, I have two problems.
>
> 1) No packets are forwarded. I hope that reason is problem stated in 2).
> Anyway, I'd be happy if someone can confirm that I'm doing everything
> right. It would be also cool if someone could post XORP configuration
> that I can use for this configuration. I can see UDP packets reach em2
> iface on mr.
>
> 2) Even all machines support IGMPv3, after I start mrouted, network
> converges to IGMPv2. What I see in tcpdump is that DIP of IGMPv2
> packets isn't in IGMP-CONTROL range (224.0.0.X), but it is set to IP
> of group that it tries to join ( 235.0.0.1 in this case ). This is
> not cast with IGMP leave or IGMPv3 reports which are generated by
> same commands after I kill mrouted and network again converges to
> IGMPv3
Please, IGNORE part about improper dest addr, I realized difference with
IGMPv3 and IGMPv{1,2} reports destionation IP. I still need some help
with setting up mcast routing...
>
> TIA
>
> iprebeg
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