Did you check out the Tuning hints on this page.
http://www.udpcast.linux.lu/hints.html
IGMP snooping is suppose to be enable.
On 12 Dec 2012 at 16:50, Daniel Sanchez Dorado wrote:
Date sent: Wed, 12 Dec 2012 16:50:26 +0100
From: Daniel Sanchez Dorado <dani(a)fib.upc.edu>
To: udpcast(a)udpcast.linux.lu, Daniel Sanchez
Dorado <dani(a)fib.upc.edu>
Subject: [Udpcast] IGMP missing
Hello,
I'm the network administrator at the Barcelona School of Informatics,
in Barcelona, Spain. We are testing a spanish deployment tool,
Opengnsys, that uses udpcast for massive file distribution, via
multicast. In our tests, we have found that udpcast floods our network
with multicast traffic, and this is a big problem for us. We have
other multicast products for many years, like Rembo, and there is no
problem about flooding.
We have been sniffing and analyzing udpcast protocols, and we think
that the problem is in the IGMP signaling. We haven't capture any IGMP
packet. We have analyzed the source code, and we haven't been able to
locate any reference to IGMP. Usually, the standard solution is
generating an IGMP-Group Specific query, to subscribe the receiver to
the group. With this step, you join a multicast group. Then, when the
sender broadcast the multicast traffic, the network is capable to
switch the packets only to the subscribed ports.
We have found, that our switches, are not capable of locate multicast
receivers PCs, because they don't see the IGMP packet. IGMP snooping
is enabled, and it allows the switches identify multicast, but, it
doesn't work.
These are our testing scripts:
RECEIVER:
./udp-receiver --file /tmp/dst.iso --interface eth0 --nokbd
SENDER:
./udp-sender --file /tmp/wi7_pr64_000.iso --full-duplex --interface
eth0 --autostart 30 --nokbd
Sender and receiver are Linux machines, in the same subnet, without
any kind of firewalls. The file arrives fine, but, the multicast
traffic floods other ports. The switch involved is a cisco
C3560G-48PS, with igmp snooping enabled, and there is multicast
enabled router (Cisco 3750G-48TS) for querier in this VLAN. Our
switches don't make any IGMP-snoop link.
Any idea?
Thanks in advance.
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