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RT-AC86U - Enable efficient multicast forwarding (IGMP Snooping)

Discussion in 'Asuswrt-Merlin' started by bookreader, Jun 13, 2018.

  1. bookreader

    bookreader New Around Here

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    At this point; things still looks dim to have RT-AC86U support IGMP Snooping for IPTV boxes (ex. CenturyLink Prism TV) :(

    Today - Running Asuswrt-Merlin RT-AC86U_384.5_0_cferom_ubi.w
    Older ASUS RT-AC86U Firmware version 3.0.0.4.382.18219 release notes "Fixed IGMP snooping related issue."

    Nov 18th, 2017
    https://www.snbforums.com/threads/r...-1-is-now-available.42127/page-10#post-359002
    "Any idea why RT-AC86U has no IGMP Snooping option? My IPTV channels freeze without it.
    RT-N66U from 2011 works fine and has this that RT-AC86U hasn't:

    Because that feature was deprecated on the HND platform, and replaced by a new MCD daemon from Broadcom. No idea how it can be accessed/configured by end users. You will have to ask Asus."
     
    Vexira likes this.
  2. zoon

    zoon Occasional Visitor

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    Although the efficient Multicast forward option is missing on the AC86 after turning on IGMP Proxy without selecting any IPTV ports i was able to to stream mutlicast successfully.
     
    Vexira likes this.
  3. bookreader

    bookreader New Around Here

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    Note - I am forced to use VLAN 201 for the WAN (GPON). That is the one difference in zoon's setup. At this point, it looks to be a hardware limitation with the internet VLAN enabled?


    Out of the box Setup:
    Select ISP Profile - None
    Choose IPTV STB Port - None
    Enable multicast routing (IGMP Proxy) - Disabled
    I CAN enable "Enable multicast routing (IGMP Proxy)"

    Current Setup:
    Select ISP Profile : Manual Setting
    Internet - VID 201
    LAN Port 4 /3 - Blank
    Enable multicast routing (IGMP Proxy) - Disable (Due to hardware limitation, IGMP proxy cannot co-exist with IPTV function.)
    Click Apply.
    Odd - Router was found powered off (not pingable, not lights) Pressed the power button out/in to power on.

    IPTV still freezes.

    Change "Enable multicast routing (IGMP Proxy)" from disable to enable.

    IPTV still freezes.
     
    Vexira likes this.
  4. teknojnky

    teknojnky Senior Member

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    Would issues involving unable to see chromecast and airplay devices over wifi be related to this?

    I can see my chromecasts and airplays when accessing from separate AP's (different SSID's), but when accessing via ac86 wifi, they do not show up.
     
    Vexira likes this.
  5. kfp

    kfp Very Senior Member

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    Yes.
     
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  6. teknojnky

    teknojnky Senior Member

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    So there is, or is not, a solution or workaround that will get chromecast/airplay working between lan and wireless ?
     
    Vexira likes this.
  7. bookreader

    bookreader New Around Here

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    Still waiting for a fix from ASUS support (ticket opened 6/14/18). The only feedback I got:
    "Multicast routing and VLAN port forwarding will not executing at same time, and it seems that's the limitation,
    But there still another IGMP snooping in Wireless > Professional page, could you advise user to enable that option?"
    I explained Wireless is not an option for the IPTV device. No issues with the old RT-N66U model router.
     
    Vexira likes this.
  8. sfx2000

    sfx2000 Part of the Furniture

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    Yes and no - keep in mind that Airplay and ChromeCast are generally intended these days for point to point on the WiFi.

    IGMP Snooping - this is generally a good thing, but this happens inside the SoC core switch, but there are limits, as @bookreader noted from Asus Support - it's a limit of the chip itself.

    There are fast path shortcuts inside the chip itself... and some conflict the the kernel configurations...

    One can try IGMP Proxy if snooping doesn't work. It's also a short-cut...

    Disable both perhaps, but you'll see a bit more traffic on the LAN/WLAN as a result.
     
  9. sfx2000

    sfx2000 Part of the Furniture

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    Ah - yes... I misread 86U as 68U...

    You might have to roll back to the N66U for a while - HND is fairly new, along with MCD...

    Your best alternative for the moment might be to let the CPE stuff do what it does, and use the RT86U where it works best in your config, which might be AP mode...
     
  10. bookreader

    bookreader New Around Here

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    ASUS support beta firmware did not help.
    CenturyLink Prism TV + RT-AC86U = nope

    Closing word from the support case:
    "Multicast routing and port forwarding of VLANs are not going to happen at the same time." :(
     
  11. Jack Yaz

    Jack Yaz Part of the Furniture

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    I guess this is still the case? BT Multicast doesn't work on my AC86U :/
     
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  12. francovilar

    francovilar New Around Here

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    Any news on this? My ISP uses multicast and my box is freezing every 10 seconds, need IGMP snooping. Using RT-AC86u and Meo (Portuguese provider).
     
  13. Smallnetbuilderguy

    Smallnetbuilderguy New Around Here

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    My IPTV (Telus) also freezes every 15 seconds or so without IGMP Snooping.

    Why did Asus remove IGMP Snooping from all latest firmwares? My GT-AC5300 doesn't have it. Even the latest and greatest AX88U doesn't seem to have it, judging from the demoui.asus.com site.
     
  14. skeal

    skeal Part of the Furniture

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    I have a AX88U and it has IGMP snooping on the iptv tab.
    Code:
    Enable multicast routing (IGMP Proxy)    
     
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  15. Jack Yaz

    Jack Yaz Part of the Furniture

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    IGMP Proxy and snooping aren't the same thing. See below from a non-HND router:

    upload_2019-8-26_15-10-31.png
     
  16. skeal

    skeal Part of the Furniture

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    @Jack Yaz can you please explain what the differences are and application of each please? Thanks in advance!
     
  17. RMerlin

    RMerlin Super Moderator

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    I believe that IGMP snooping is handled by a different daemon on the RT-AC86U and RT-AX88U. @themiron would know more, he's more familiar than me with IPTV stuff.
     
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  18. skeal

    skeal Part of the Furniture

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    Hello @themiron please add your bountiful knowledge here.