multicast DNS not propagated

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multicast DNS not propagated

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multicast DNS not propagated
multicast DNS not propagated
2023-11-27 21:26:48
Model: Deco M5  
Hardware Version: V3
Firmware Version: 1.7.3

multicast DNS not propagated

I'm having an issue where mDNS packets are not propagated in my network.
When connecting directly to the access point where the mDNS device is connected to,
it's visible using avahi-browse --all --ignore-local.
But when connecting to the M5 Deco modules, only mDNS devices connected to those are
visible on the network.
Somehow the packets are not propagated between the M5 Decos and our other (TP-link) accesspoint.

model: M5(3.0)
firmware: 1.7.3 Build 20230906 Rel. 59213
- no firmware upgrades available

when opening advanced -> system -> system parameters
- operation failed
- only WAN Unicast is shown with a grayed out 'Enable WAN Unicast'

M5 Deco system is setup in 'Access Point' mode.

Network:
- WAN -> routerA -> M5 Deco -> laptop
                -> accesspointA -> mDNS device

I want to see the mDNS traffic from the laptop, so routerA should forward them from mDNS device -> accesspointA -> routerA -> M5 Dec
o -> laptop.

routerA has wireless disabled
accesspointA has wireless enabled
routerA IP address: 192.168.1.254
M5 Deco IP addresses (DHCP):  
- 192.168.1.68
- 192.168.1.70
- 192.168.1.71
accesspointA IP address: 192.168.1.2

routerA is doing DHCP and is a Nokia-branded device: manufacturer: ALCL, productclass: XS-2426G-B

When connecting to the M5 Deco network, multicast traffic _inside_ that network is available.
Multicast traffic from accesspointA (same subnet) is not available.
When switching from the Decos to accesspointA, multicast traffic from devices connected there is available.

Somehow traffic doesn't seem to be propagated between Deco M5 and accesspointA.
In routerA there don't seem to be much settings available regarding multicast traffic.

Other related topics that I read without resolving this:

about m5 deco:

- deco m5 mdns support: https://community.tp-link.com/en/home/forum/topic/178642
- M5 & TimeMachine: https://community.tp-link.com/en/home/forum/topic/166454
- M5: Should I enable IGMP?: https://community.tp-link.com/en/home/forum/topic/268164
 - Note: Our M5 doesn't show this option
- Problems enabling IGMP snooping on TP-Link deco M5: https://community.tp-link.com/en/home/forum/topic/606116

about other deco products:

- Elgato Key Lights intermittent visibility and controllability when Deco mesh is in Router mode: https://community.tp-link.com/en/h
ome/forum/topic/245872
- Deco X60 mDNS support: https://community.tp-link.com/en/home/forum/topic/236100
- e4 mDNS flood: https://community.tp-link.com/en/home/forum/topic/202160
- Multicast communication is not working: https://community.tp-link.com/en/home/forum/topic/617346

I feel I might be overlooking something here, but I cannot figure out what I'm missing.
They seem to propagate the packets received on them fine,
but somehow they don't propagate any packets coming from the other access point.



related to: multicast, mdns, bonjour, avahi, igmp

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#1
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3 Reply
Re:multicast DNS not propagated
2023-11-28 07:36:27

  @PauSch 

Hi, Thank you very much for your feedback.

May I know the model number of the other Access Point A?

I think the web UI issue is like the post here: https://community.tp-link.com/en/home/forum/topic/623410

IGMP is enabled by default on the Deco and the IGMP on/off is to decide whether to fix IGMP to V3 only.

 

Are you able to stably reproduce the issue mentioned here:

Network:
 WAN -> routerA -> M5 Deco -> laptop
                           -> accesspointA -> mDNS device

 

When connecting to the M5 Deco network, multicast traffic _inside_ that network is available.
Multicast traffic from accesspointA (same subnet) is not available.
When switching from the Decos to accesspointA, multicast traffic from devices connected there is available.

 

Wait for your reply and best regards.

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#2
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Re:multicast DNS not propagated
2023-12-05 19:26:23

Hi @David-TP 

 

The model name of accesspointA is TP-Link Archer C7 v5.

It's running OpenWrt where in everything is configured in one zone.

As far as I can tell there's no firewalling, and I do see multicast traffic from devices directly connected.

I am indeed able to stably reproduce this issue.

 

I think the web UI issue is not related, but wanted to mention it while I was at it to rule out anything there.

 

Not sure what else I can do to look for the cause of this issue.

 

Thanks!

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#3
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Re:multicast DNS not propagated
2023-12-07 12:11:17

  @PauSch I've had a lot of issues with mDNS/Bonjour and Airport Utility in my home network the past few days.

 

My current conclusion is that the switch in the NOKIA XS-2426G-B router is causing the problems. Not the TP-link devices as such.

 

Running most of the traffic through (old) Sitecom switches and a (new) TP-Link switch solves everything.

Now I've linked my Deco X20 Main unit to an ethernet port of the Nokia, and a switch to an other port of the Nokia. Nothing else.

The rest of the (wired ethernet) network runs through that 'lower' switch, or switches connected to it.

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