allowing roku discovery across VLANs

Raffi_

@jwj said in allowing roku discovery across VLANs:

This can be done (arguably better done) on your switch, if at all.

I'm curious about this. I never found a solution to my Youtube discovery issue across VLANs. How would it be done on the switch? Is that what IGMP snooping on a switch does?

@Raffi_ Partly. Then you need to setup what to do with the traffic you are snooping. Depends on the switch. My CISCO Small Business (SG-220 50P) has a terrible interface and garbage documentation. That's why I haven't done it yet. I really should do it soon.

JKnott

@Raffi_ said in allowing roku discovery across VLANs:

Is that what IGMP snooping on a switch does?

Yep, or a router. Here's what Wikipedia says:

"The Internet Group Management Protocol (IGMP) is a communications protocol used by hosts and adjacent routers on IPv4 networks to establish multicast group memberships. IGMP is an integral part of IP multicast and allows the network to direct multicast transmissions only to hosts that have requested them."

Raffi_

Thanks guys, I'll have to look into that more for my switch.

johnpoz

Where that is really meant to be used.. Is say you have a L2 network.. That you want to multicast some video too.. You could allow only devices that want to see this multicast stream to join this group.. So that multicast is not sent to them if they are not a member of that group.

If not then every port on the switch would see that multicast traffic..

Now you can do this across multiple vlans with a multicast group that spans L2 networks.. But again you allow a client to join this group.. Then only then do you send them traffic from that group or let them send traffic to that group.

You don't just flatten the different L2 networks by sending all multicast traffic to both or multiple L2 allowing for discovery.. That defeats the whole point of isolation and security.

To be honest its the software makers lack of thought that brings these sorts of problems... Why does the roku app have to discover.. Because it makes it easy for the user - and 99% of users just have 1 flat network.. So why should they do anything different.. You know like actually publishing what specific ports and protocols are used.. The ability to add a device via fqdn/IP and be done with.. The roku apps allows you to add a device manually.. But then again - that is a like a button click, and just too much work ;)

Security goes out the window as soon as there is any sort of lack of convenience to it..

@johnpoz Good overview. Thank you!

imthenachoman

@johnpoz said in allowing roku discovery across VLANs:

full byte

HA!

@jaaasshh Did you ever figure this out? I know this breaks @johnpoz's heart but I'm trying to do the same.