DNS-SD adds the ability to announce "services" over mDNS or regular unicast DNS. It's also called Bonjour among other things, and it too uses multicast to let network devices discover each other. mDNS with DNS-SD is an alternative system for doing pretty much the same thing as SSDP.Any number of software running on your computer can be the source of the M-SEARCH, some OS'es like Windows will even send these themselves as a part of the built-in "network discovery". Only "subscribers" to 239.255.255.250 will actually receive these messages (the OS network stack filters multicast messages), but as with all multicast packets, the packets themselves are sent to all network devices. SSDP is just the UPnP discovery mechanism that somebody thought should have its own name. 239.255.255.250 is a multicast address that is defined in the UPnP standard. The SSDP traffic is just a general "poll" for devices that matches the search.You're observing two different things that are independent from each other.
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