You can use tp-link in access point mode to remove double NAT, though m4 would lose some functionality like parental control etc.I started getting ipv6 in Airtel from yesterday. Using the Nokia G2425G-A router + TP-Link Deco M4 setup. I do not have bridge mode enabled in Nokia Router so basically am on double NAT.
Unfortunately I was not getting ipv6 from TP Link in Router Mode. I changed ipv6 to Bridge Mode method of connecting in TP Link app and voila..All devices are now able to get ipv6 using TP link mesh wifi. My IPV4 addresses are still behind double NAT.
Hope the above helps for anybody facing similar issue.
Speedtest as in Speedtest by Ookla - The Global Broadband Speed Test I believe? yea this is normal, I also get this when PC is connected via Ethernet cable, but it is not the case when downloading actual heavy duty stuff. like large files or games etc. I get around max 250 on 200mbps connection in this case.I'm getting a ridiculous 850mbps download and 890mbps upload on speedtest today. I presume because of the ipv6 integrations. Usually I get around 230 or so on both.