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I have a simple config where 2 Windows servers are generating each multicasts on the same addresses.

For example, on a direct Ethernet wired link between the servers they both generate the multicast 239.193.17.17:6895.

On another NIC, where there is a simple network switch in between the servers, they both generate the multicast 239.193.18.18:6888.

Is there a conflict caused by using the same multicast IPs in this configuration?

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No. In fact, multiple sources sending traffic to the same multicast group is completely normal, for example in service discovery protocols like SSDP.

They’re still regular IP packets with a sender address, making the various sources identifiable.

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  • Ok, thanks for your answer. These multicasts are digital video broadcasting (DVB) transport streams and I want to analyze them with a DVB analyzer. I suppose it depends on the DVB analyzer if it can handle this, correct? But normally, I suppose it should.
    – ovdsrn
    Dec 22, 2015 at 10:50
  • Yes. If you want to improve your chances, you could perhaps use different destination ports.
    – Daniel B
    Dec 22, 2015 at 10:56

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