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Multicast Issues on LAN - How to Enable IGMP proxy or snooping?

Abhinav Kumar

My home network is structured as follows:

 

WAN1---| ----Sophos XG ---> L2 Switch ---> 2 X Netgear Orbi as AP

WAN2---|                                  |----> Wired devices and few other L2 switches

 

There are approx 60 devices on the LAN including a few PCs/servers , few mobile phones, several IoT devices and several media devices (4X Airplay receivers, 2X DTS PLAY-FI receivers, 5X Echo, 2 X google home , 2X chromecast, 2X AVR, 2 X harmony hub)

 

Over time, I had noticed some red flags that should have pointed me towards a multicast flooding issue e.g. delays in initiating Airplay streams, delayed response on networked light bulbs, delays in harmony remotes etc .

Last week I added two of the aforementioned DTS play-fi devices and that was the proverbial straw that broke the network.

Many of the LIFX smartbulb devices simply dropped off the network, airplay to certain devices (Marantz AVR) stopped working etc

 

Realizing that this is something related to multicast on my LAN, I temporarily switched off the SOPHOS XG and connected a really cheap consumer grade router (TP Link 470t+) and enabled the IGMP proxy setting on that.

Voila! All problems simply disappeared.

I dug around in XG to find anything similar but the closest I could find was PIM-SM but from what I understand, PIM-SM is meant for efficient multicast routing on the WAN side rather than on the LAN side.

 

Any thoughts or suggestions? 

 

 



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  • 0

    Why not try splitting your network and move a number of the devices like the lights into a seperate network, could be a VLAN.

    Ian

    Also some smart/managed switches have the feature you are after, so check yours and if it does enable them.

  • 0 in reply to rfcat_vk

    rfcat_vk said:

    Why not try splitting your network and move a number of the devices like the lights into a seperate network, could be a VLAN.

    Ian

    Also some smart/managed switches have the feature you are after, so check yours and if it does enable them.

     

    I am relatively unfamiliar with IGMP/mDNS so apologies if this is a stupid question

    I do have a switch that supports IGMP proxying - Would an IGMP proxy work the same way as a regular proxy ?

    In other words, if i have a switch setup as an an IGMP proxy sitting independently on the LAN (and not the XG router), would that still work as one?

  • 0 in reply to Abhinav Kumar

    I am like you very unfamiliar with the protocol. I was just suggesting another way to achieve your aims.

    You are a home user, experiment.

    Ian

  • 0 in reply to rfcat_vk

    Makes sense - I am going to try two things.

    The XG is connected to the rest of my network via an unmanaged GBe switch

    1 - Use an old non GBe managed switch with IGMP proxy enabled to the unmanaged switch and then link up the ports  that constitute most of the multicast devices (including the Orbi access point) via the managed switch

    2 - Buy a new managed switch and then go the whole hog of segregating the network into different VLANs

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  • 0 in reply to rfcat_vk

    Makes sense - I am going to try two things.

    The XG is connected to the rest of my network via an unmanaged GBe switch

    1 - Use an old non GBe managed switch with IGMP proxy enabled to the unmanaged switch and then link up the ports  that constitute most of the multicast devices (including the Orbi access point) via the managed switch

    2 - Buy a new managed switch and then go the whole hog of segregating the network into different VLANs

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