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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