Hi all !
I had a question in regards to multicast, and VLAN segments. We frequently use Chromecasts within our networks so users can stream video/presentations/chrome content to various conference rooms. The Chromecast devices operate on the DIAL protocol. The DIAL Service Discovery enables a client to discover DIAL Server (Chromecast) on its local network, and obtain access to those services. This is achieved using a new search target within the SSDP defined by uPNP. In short if your not on the same segment as the chromecast device you will be unable to see it.
I was wondering if it would be possible to forward that traffic to a particular network. In this scenario users on the wireless network (VLAN 300) can see the Chromecast. Users on the wired network (VLAN 100) cannot. I have tired playing with the UDP relay, and various ACLs without success.
When clients connect to the Chromecast they send a request over UDP to IP address 126.96.36.199 and UDP port number 1900.
Any suggestions would be great.
Thanks for asking your question on the forum!
After doing some research, it looks like Chromecast uses a multicast discovery packet which discovers clients who want to cast. This multicast packet has a TTL of 1 so it cannot be routed across subnets.
However, I believe Google is looking to add a feature soon that will take away the requirement of being on the same wireless network/subnet.
Please do not hesitate to let us know if you have any questions.
Thanks Noor !
I appreciate the reply - I will have to dig into this a little more - I hope they make the change!