Sorry if duplicate...Multicast Routing

[Robert Watson]

On Tue, 17 Jun 2003, Tom Daly wrote:

> Could you clarify a bit? Are you able to move the multicast traffic
> between each side of the IP-IP tunnel? 

Yes.  We use mrouted to configure multicast tunnels in pretty much the
following way (IP addresses tweaked to protect the guilty):

% more mrouted.conf
tunnel  10.33.1.16      192.168.49.50     metric 1        threshold 1
tunnel  10.33.1.16      192.168.10.251    metric 1        threshold 1
...

In this case, 10.33.1.16 is the local IP, and 192.168.49.50 are remote IPs
of other multicast tunnel endpoints with similar configurations.  The
remote boxes are generally on the other side of wide area networks without
multicast routing in between.  This "just works". 

> 
> Tom
> 
> On Tue, 17 Jun 2003, Robert Watson wrote:
> 
> >
> > On Tue, 17 Jun 2003, Tom Daly wrote:
> >
> > > Has anyone been able to create a unified multicast broadcast domain
> > > using FreeBSD routers and tunnels? Our internal telephone system VOIP
> > > system that uses multicast to handle things like conference calling and
> > > paging.  Many of our employess are off site, which DSL lines. A FreeBSD
> > > box creates a PPP tuennel for packet flow, which lets basic VOIP
> > > functions happen, but to allow more flexibility, I need to route
> > > multicast traffic as well.  Anyone have any good suggestions as to how
> > > to get this going? I have tried numerous things with mrouted, but they
> > > do not seem to work.
> >
> > I've never used PPP to directly tunnel multicast, although the tun0
> > interfaces appear to have the MULTICAST flag set.  The configuration we
> > use here at NAI Labs is to use IP in IP tunneling between sites, and IP
> > multicast over ethernet multicast on local area networks, which works
> > quite well.  We use this specifically for video multicast, since we are
> > generally relying on the phone networks to do audio still for latency
> > reasons.
> >
> > Robert N M Watson             FreeBSD Core Team, TrustedBSD Projects
> > robert at fledge.watson.org      Network Associates Laboratories
> >
> >
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> >
> 
> -- 
> Tom Daly
> tom at dyndns.org
> Chief Infrastructure Officer
> Dynamic DNS Network Services
> http://www.dyndns.org/
> 
>