[FIXED] Wierd Behaviour on Wifi

So, observing for 24h after the router reset, the issue didn't go away. Even apps like Spotify and Hotstar on devices connected to WiFi were stuck on a black screen as they struggled to load anything. Switching to mobile data solved this issue immediately.

Moving on, I switched to IPv4 only mode on ZTE router from IPv4/6 Mode and right away I could feel the issue to be resolved on devices connected to this WiFi. So that seems to have been the cause of the problem.

Anyone can help me figure out how that could have been a cause? IPv6 was working as I was getting an IP through it as well. So why would it cause issues on selected services on devices connected through WiFi and not devices connected through Ethernet?

FIX:
Others who come across this thread:
Switching back to IPv4 mode only from IPv4/6 mode fixed the issues.
 
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@FujiwaraTofu it could be because of IPv6 ICMP not being configured correctly on your TP-Link and/or Airtel supplied router. This is why it works well on IPv4. To use your TP Link make sure you switch off DHCP there and only use the Airtel router to perform this function. Best is to set the Airtel router to bridge mode (via the Airtel backend, raise a request by calling 121) and then use the TPLink to perform router/firewall functions.

Also check the signal strength for the optical RX signal in the module statistics. It should be less than -25 dB
 
@Chip, all the issues remained even after I had taken Archer C6 out of the equation. Even earlier it was just being used as a dumb AP for WiFi no DHCP, all the routing and heavy lifting was done by the ZTE router. I didn't get time earlier to contact Airtel CC for bridge mode but maybe now I will, to see if IPv4/v6 mode will work better when my C6 is the main router.

It hasn't crossed -25 dB as far as I remember.
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FujiwaraTofu said:
to see if IPv4/v6 mode will work better when my C6 is the main router.
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Your optical connection measurements are good enough. However, you will require reconfiguration of the Archer for IPv6+IPv4. Should be easy like the other home Wi-Fi routers. There are guys who have set up v6 on Airtel using 3rd party routers. You may want to check that thread too.
 
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