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I am struggling to create a multicast communication with basic client and server. So I looked on the web to find any working example... and they don't work.

I mean the server is waiting for a message that never arrive.

For example, that one : http://www.nmsl.cs.ucsb.edu/MulticastSocketsBook/ (c_send_receive.tar.gz)

So I was wondering if it was Opensuse who would blocked the packets.

user@linux-uxnx:~> ip link 

1: lo: mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00

2: enp0s25: mtu 1500 qdisc pfifo_fast state UP mode DEFAULT qlen 1000 link/ether 00:23:18:ed:ef:59 brd ff:ff:ff:ff:ff:ff

3: wlp3s0: mtu 1500 qdisc noop state DOWN mode DEFAULT qlen 1000 link/ether 00:23:14:3c:7e:50 brd ff:ff:ff:ff:ff:ff

But it seems that everything is ok.

1 Answer 1

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If you use virtualization, there may not be multicast support in virtualized network and virtual switches or it must be explicitly enabled.

In the past I have encountered this problem when trying to use OSPF multicasts in KVM.

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