[zeromq-dev] Trying to get a publish - subscribe test program working with multicast.

Thomas Loockx thomas.loockx at otoy.com
Fri Oct 19 01:07:12 CEST 2012

I've enabled debugging in openpgm, but it outputs not much really:

arg: client
Running as client
Minor: OpenPGM 5.1.118 (1369) 2012-10-18 17:56:46 Linux x86_64
Minor: Detected 4 available 4 online 4 configured CPUs.
Minor: Using TSC timer.
Minor: TSC frequency set to 1200 MHz
Trace: Opening UDP encapsulated sockets.
Trace: Set socket sharing.
Trace: Request socket packet-info.
Trace: Assuming IP header size of 20 bytes
Trace: Assuming UDP header size of 8 bytes
Trace: Binding receive socket to INADDR_ANY
Trace: Binding send socket to interface index 2
Trace: Join multicast group on interface index 2
Trace: Multicast send interface set to index 2

I guess multicast is working fine on my network because I actually see
all the multicast packets appearing on my network.


On Fri, Oct 19, 2012 at 11:20 AM, Steven McCoy <steven.mccoy at miru.hk> wrote:
> On 18 October 2012 18:13, Thomas Loockx <thomas.loockx at otoy.com> wrote:
>> Further investigation shows that on the server side IGMP joins are
>> received to join the multicast group. And I can see the multicast
>> traffic on the client side as well. It seems that the multicast
>> traffic is not "picked up" by zeromq.
> For diagnosis first try iperf or netperf so see if multicast is working
> well.  If that's good then try building OpenPGM with Scons and using the
> bundled tools for testing.  There are some changes upstream to fix some
> unusual characteristics of some platforms.
> You can try setting PGM_LOG_LEVEL_DEBUG for additional tracing but may
> require a debug build for productive notes.
> Chalk it on a todo list for a multicast debug tool.
> --
> Steve-o
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