Multicast over GRE between Linux server and Cisco Router

Tue Jan 22 05:27:13 UTC 2013

>From my experience, it seems most Linux multicast development has stalled
significantly in recent years.

None the less, look for something called "smcroute".  You should be able to
use this to manually peg up a route and generate the join.

Also take a look at the output of netstat -n -g to see the join.

igmpproxy is also good if this is a stub network and you're trying to proxy
joins.

Let me know what ends up working for you.  I've fought this one once
already.  I never did like the results, but I ended up using the igmp proxy
method.

On Fri, Jan 18, 2013 at 8:07 PM, Tom Ammon <thomasammon at gmail.com> wrote:

> IGMP packets are sent with TTL=1. Is the tunnel interface on the router
> enabled for PIM?
>
> Tom
>
>
> On Fri, Jan 11, 2013 at 5:11 AM, Brian Christopher Raaen <
> mailing-lists at brianraaen.com> wrote:
>
> > Just a quick note. I do have multicast enabled on the server gre1
> > interface.  A tshark capture shows the igmp group queries from the router
> > and the igmp join reply from the server.
> >
> >
> > On Wed, Jan 9, 2013 at 10:51 AM, Brian Christopher Raaen <
> > mailing-lists at brianraaen.com> wrote:
> >
> > > I am trying to set up multicast between a Linux server and Router using
> > > GRE.  The GRE tunnel is up fine and I can see traffic go across it, but
> > the
> > > router is not indicating it is receiving the IGMP joins that the server
> > is
> > > sending.  I have identical setting with another server attached to
> > > fastethernet0/1 and it is joined to the group fine, but I am not able
> to
> > > get the server to link to the router via GRE interface.  Note that I
> have
> > > another server behind another router where the two routers do GRE and
> PIM
> > > and that on is working fine.  Is there some reason that IGMP joins
> would
> > > not work across the GRE link, but another router using PIM would?
> > >
> > > --
> > > Brian Christopher Raaen
> > > Network Architect
> > > Zcorum
> > >
> >
> >
> >
> > --
> > Brian Christopher Raaen
> > Network Architect
> > Zcorum
> >
>
>
>
> --
>
> -----------------------------------------------------------------------------
> Tom Ammon
> Network Engineer
> M: (801) 674-9273
> tom at tomsbox.net
>
> -----------------------------------------------------------------------------
>