In the standalone WebRTC build, DTLS must be enabled by either the Use the SCTP-based DataChannels in Chrome. You do not need to specify any constraint in order to The standards-compliant SCTP-based DataChannel implementation has been FAQ about the current implementation What’s the status of Unified Plan SDP?Ĭhrome is in the process of transitioning from the old, non-standard SDPĬalled “plan b” to the standardized format called “Unified Plan”.ĭetails of this transition are found in the Unified Plan document. I assume that Chrome OS also take part in this, so it might be that for example a Chrome browser running on another OS and Chrome OS will 'keep in touch' using this system.Both getUserMedia and RTCPeerConnection are implemented and shipping in Chromeįor Windows, Linux, Mac and Android. I'm not fluid in mDNS, but it seems to me like this is also a 'poll' looking for peripherals that support this 'service'. _googlecast._tcp.local is one such 'service' that is used by ChromeCasts, Android TVs, Google Home, the Chrome browser and all other things in the 'Google ecosystem' that can take part in their 'cast' system. 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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