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Forum Discussion
IGMP Snooping
Hi, in my home network, I have a 2018 Orbi RBR50 router and have set it up with IGMP Proxying. However, I cannot find a setting for IGMP Snooping. I understand that IGMP Snooping is necessary for eff...
Orbi does not support IGMP snooping. Only IGMP proxying on the WAN port is supported.
Why do you need IGMP snooping? Do you have devices that use IGMP multicasting which affects the performance of your LAN network, for which you want to use IGMP snooping?
ekhalil wrote:
Orbi does not support IGMP snooping. Only IGMP proxying on the WAN port is supported.
Hm, what should be the purpose of this then? An IGMP proxy does enable hosts in a uni-directional link routing (UDLR) environment that are not directly connected to a downstream router to join a multicast group sourced from an upstream network. When I have it right, the IGMP proxy does also serve an the IGMP querier to the LAN. Rather useless if the multicast noise does go out over all links (both wireless and wired backhaul, all Ethernet ports, and all AP radios, isn't it?
ekhalil wrote:
Why do you need IGMP snooping? Do you have devices that use IGMP multicasting which affects the performance of your LAN network, for which you want to use IGMP snooping?
Major ISP introduced massive IGMP Multicast based IPTV solutions in the last years. In my understanding Noroddveien ISP does also provide live TV over IGMP Multicast.
FURRYe38 wrote:
Not alot of use for IGMP in most homes so maybe one reason why NG didn't add it ot the Orbi. Something to ask them about though.
It's the #1 industry standard used by ISPs for IPTV. Millions of deployments alone here in Switzerland by the major and smaller ISP feeding FullHD and UHD (4K). That's why non-managed switches can't be deployed anymore without causing massive issues - at least some Smart Managed Plus switches wuth IGMP Multicast support for one VLAN are required.
schumaku wrote:
Hm, what should be the purpose of this then? An IGMP proxy does enable hosts in a uni-directional link routing (UDLR) environment that are not directly connected to a downstream router to join a multicast group sourced from an upstream network. When I have it right, the IGMP proxy does also serve an the IGMP querier to the LAN. Rather useless if the multicast noise does go out over all links (both wireless and wired backhaul, all Ethernet ports, and all AP radios, isn't it?
IGMP Proxy and IGMP Snooping can achieve the same goal of reducing traffic replication. The router maintains a mapping table and forwards multicast traffic only to the hosts that have joined the specific multicast group.
schumaku wrote:
Major ISP introduced massive IGMP Multicast based IPTV solutions in the last years. In my understanding Noroddveien ISP does also provide live TV over IGMP Multicast.
IGMP Proxy should solve the issues that Noroddveien seeing. The only problem is that IGMP is directly connected to VLANs. Orbi -currently- supports VLAN tagging only for wired ports and not for wireless.
So by connecting the IPTV box to a LAN port in Orbi, configure a VLAN on it and activating IGMP Proxy should basically both improve the IPTV quality and prevent multicasting from affecting the other devices in the network.
ekhalil wrote:
The only problem is that IGMP is directly connected to VLANs. Orbi -currently- supports VLAN tagging only for wired ports and not for wireless.Orbi has got VLAN support for the switched Ethernet ports at least? I must have missed something. This would be amazing considering Netgear refused to introduce this feature not that long ago following the complaints about the poor L2 separation of the Guest wireless network.
ekhalil wrote:
So by connecting the IPTV box to a LAN port in Orbi, configure a VLAN on it ...The documentation is seriously lacking (Orbi and Orbi Pro User Manuals [does not show the BT ICMP Proxy], the usability of the UI to _disable_ it you have to tick it, while for the BT ICMP Proxy one has to tick it to enable is more of a joke, and I can't find any KB entry explaining _exactly_ what is supported and where (e.g. only Orbi Router LAN port, Orbi Router primary AP LAN Ports, Satellite LAN port(s)? ...).
Netgear product design and product management at it's best. ChristineT Christian_R please make some wake-up calls.
schumaku wrote:
.......Orbi has got VLAN support for the switched Ethernet ports at least? I must have missed something. This would be amazing considering Netgear refused to introduce this feature not that long ago following the complaints about the poor L2 separation of the Guest wireless network.
Yes, Orbi has VLAN Support for LAN ports.
schumaku wrote:..........
The documentation is seriously lacking (Orbi and Orbi Pro User Manuals [does not show the BT ICMP Proxy], ........
Yes, I agree that IGMP (not ICMP :) ) is not well documented and that not enough flexibility is given for configuring the feature. For example there is no manual static multicast forwarding which will make configuring this feature straight forward for the very common use of IPTV boxes.
Overall, I think that IGMP is a simple protocol where -simply- a device requests membership to a group (VLAN) through the router while the router listens for these requests and periodically sends out subscription queries.
For VLANs, there is a brief KB here: https://kb.netgear.com/000038854/How-do-I-set-up-a-bridge-for-a-VLAN-tag-group-for-my-Orbi-WiFi-System-if-I-live-in-Singapore
For info:
The Norwegian ISP (Telenor) does not use VLAN for multicast IPTV. Their Zyxel router is not set up with VLAN either. The only real difference I can see between the way I have set up my Orbi RBR50 and the ISP router is that I do not have IGMP Snooping.
Noroddveien wrote:
The Norwegian ISP (Telenor) does not use VLAN for multicast IPTV.
That's one of the key reasons for doing IPTV (live) on ICMP Multicast - you don't have to set-up these messy WAN-VLAN-to-a-LAN-port (or WLAN-SSID) requiring dedicated cabling and switching.
Would love to provide some more assistance, however the information available and what is available is that marginal ...
