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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...
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.
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 ...
For additional info, I am attaching a dump of the ISP router´s configuration file (Zyxel 8702N). IPTV functions the way it is suppose to with this setup. The information in the file is beyond my capabilty to interpret. Perhaps there is a setting there that explains why IPTV works with the ISP router but not flawlessy with the Orbi.
Noroddveien wrote:
For additional info, I am attaching a dump of the ISP router´s configuration file (Zyxel 8702N). .....
Thanks for the info. The ifconfig command just shows the available interfaces in the router, their status and capabilities.
The only useful thing I see in this config information is that interface en0 (which I guess is your WAN port) has VLAN_HWTAGGING which gives an indication that the Zyxel router is using VLAN tagging (may be pre-configured?) to direct multicast traffic towards the IPTV box.
Noroddveien have you tried the suggestion in this post? That is connecting the IPTV box to a LAN port in Orbi, configure a VLAN on it and activating IGMP Proxy in WAN Setup. Or do you want the IPTV to only be attached wirelessly to Orbi?
Noroddveien wrote:
.....The Norwegian ISP (Telenor) does not use VLAN for multicast IPTV. Their Zyxel router is not set up with VLAN either. ......
Likely the Zyxel router is pre-configured with a Static Multicast Forward to the ISP's IPTV boxes.
Yes there are routers that allow manual configuration of static multicst tables, but if that is not possible (and it's not possible in Orbi) then the only way to protect the network from multicast floods is by directing it to specific VLAN(s).
