From: lartc-bounces@xxxxxxxxxxxxxxx on behalf of Steve Eckmann
Sent: Wed 12/7/2005 10:55 AM
To: lartc@xxxxxxxxxxxxxxx
Subject: multicast over GRE tunnel
I need to send multicast traffic through a GRE tunnel between
two Linux
routers. The tunnel works for normal IP packets, but I can't see
how to
make it work for multicast. Here's the
setup:
10.10.10.0/24
LAN-B--------------RtrB-------------RtrC--------------LAN-C
192.168.2.0/24
192.168.1.0/24
RtrB interfaces:
eth0
192.168.2.1
eth1 10.10.10.11
RtrC
interfaces:
eth0 192.168.1.1
eth1
10.10.10.201
Tunnel setup on RtrB:
ip tunnel
add netC mode gre remote 10.10.10.201 local 10.10.10.11
ip link
set netC up
ip addr add 10.10.10.11 dev netC
ip
route add 192.168.1.0/24 dev netC
Tunnel setup on
RtrC:
ip tunnel add netB mode gre remote 10.10.10.11 local
10.10.10.201
ip link set netB up
ip addr add
10.10.10.201 dev netB
ip route add 192.168.2.0/24 dev
netB
I'm stuck here. I tried adding routes for 224.0.0.0/4 and for a
specific
multicast group (say 239.16.2.2) to the netB and netC "devices", but
the
multicast traffic isn't getting out of its source LAN. Are there
ip
commands that will do it? Do I need additional software running
for
multicast? I couldn't get mrouted or pimd to compile on Fedora Core 4.
I
installed xorp but haven't tried running it yet because I'm
very
confused about what is needed, besides the basic kernel and
iproute2,
for a multicast-capable Linux
router.
Thanks.
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