DNS address pointing to the gateway prevent Netflix from working
DNS address pointing to the gateway prevent Netflix from working
[Setup]
ER707-M2 gateway connected to my ISP (gigabit fiber).
SG3218XP-M2 main network switch
Couple EAP772 wifi access-points (powered via PoE ports on the switch)
All centrally managed via an Omada SDN Controller 6.0.0.25 (docker container)
[Issue]
A couple days ago we ran into an issue that Netflix refused to start streaming after selecting something to play. While it normally starts within a second or so, it now takes a couple of seconds before it shows a percentage indicator that slowly increases to 25% and then stops. When testing with my phone which is connected to the same subnet (but via wifi) I have no trouble whatsoever.
A full factory reset on the Samsung Q8F smart TV did not solve the issue. After setting up it was immediately there again. Other internet based services like Youtube, HBO etcetera work fine, so I could safely say it's not the ethernet cable connecting the TV to the network.
After spending a couple hours diagnosing the issue and toggling many settings to find a solution, I finally decided to change the LAN settings and set the normally automatically configured DNS server to a manually chosen one and use 8.8.8.8 as DNS server IP (Google).
Directly after refreshing the network connection on the TV, Netflix started working as normal. No issues, no delays, instant playback! To confirm the issue I reversed the modified settings, resulting in a dead Netflix again.
Not a single settings was recently changed before the issues started. The only thing I noticed was an update to the Omada controller just before the issues started.
The issues seem to be DNS related and because I'm using local DNS entries, I can't just leave the DNS server set to 8.8.8.8.
Anyone who has experience the same or similar and has a clue what to look for or change?
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Hi @Theedoek
It's for both of you.
We have identified a similar issue. But that specific issue has a prerequisite: using dual-stack IPv4 and IPv6, which is the case of Mr. @SuperUserOne
Now that you don't use IPv6 at all, we will investigate your feedback further. Will keep you posted once we get any updates. Thanks for your feedback.
Theedoek wrote
Vincent-TP wrote
Sorry, I mixed you up with another user—please disregard.
We’ve identified the cause of the DNS issue you reported and are currently discussing a solution.
I assume this message is for me then (OP of this topic)?
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Hi @Theedoek
Root Cause Analysis:
Netflix is highly sensitive to DNS resolution, and this issue is likely caused by the DNS64 mechanism.
Even if you are not using IPv6, when a device queries a domain name and receives an IPv4 address, DNS64 may still synthesize an IPv6 address (AAAA record) and return it to the client.
Description of the Issue:
When this occurs in the TV’s Netflix client, the actual process is as follows:
- DHCP → Obtains DNS = Gateway.
- Netflix requests the domain name.
- DNS64 returns a synthesized IPv6 address (AAAA record).
- The Netflix client attempts to stream via IPv6.
- However, the actual network has no IPv6 routing and no NAT64 in place.
As a result, functions like API calls or login may still work over IPv4, making it appear to the user that they can log in and browse but cannot play videos. This issue aligns with the DNS-related problem I talked with @SuperUserOne.
Solution:
We are preparing to resolve this issue through a firmware update. Please stay tuned for further updates.
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Thank you for clarifying Vincent.
I did see quite a few similarities between my post and SuperUserOne's post.
Let's see what a firmware update will bring us!
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