nimbus 4321 wrote:
Following the thread at
http://forum.openvz.org/index.php?t=msg&goto=21090
<http://forum.openvz.org/index.php?t=msg&goto=21090> , the VEs are
configured to use veth, with the veths connected using a bridge (vzbr0).
The routing tables are setup so that the (unicast) IPs for the VEs are
routed via the bridge. This all works fine for unicast in all scenarios
- i.e. between the VEs, between the hosting HN and VEs, and between
other nodes and the VEs. It also works fine for multicast between the
VEs if they are on the same HN. However, it does not work for multicast
from the HNs to the VEs they are hosting, or from other nodes (including
VEs on other nodes) to the VEs.
Steps carried out so far:
In attempting to get multicast working between VEs on separate machines
(HNs), so far, I've carried out the following:
1. Added a route for the Class D multicast address to the bridge
(vzbr0). This enabled multicast from the hosting HN to the VE it was
hosting (verified this using ping). However, other nodes, including the
VE on the other HN still could not send / receive multicast traffic from
the VE.
2. Attempted to enable multicast forwarding by echo 1>
/proc/sys/net/ipv4/conf/vzbr0/mc_forwarding . However, this was denied
("Operation not permitted"). Perhaps the OpenVZ RHEL4 kernel does not
allow this by default ? However, unsure if this is required to get
multicast to work.
Questions:
So, no luck with the above. Does anyone have any suggestions as to how I
could get this to work ?
In particular, is enabling the mc_forwarding setting required ? If so,
is a RHEL4 kernel available with this enabled ?
Or is there something else I'm missing ?
I started that forum thread and I got it running. Please print a
route -n
from the hardware node(s) as well as the VEs. Try to use ssmping (RPMs
for RHEL at http://www.pramberger.at/peter/services/repository/rhel4/)
for debugging, it helped me a lot.
Regards,
Peter
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