IPv6 Enabled But Doesn't Work?

[itsureya]

yeah so i finally got a dedicated router for my connection and the exact same issue still seems to persist. Could it really be a hardware issue? I do have an Airtel ONT should I try putting that on bridge mode? Anyways, Currently my router is TP-Link AX10 and my ONT is SY-GPON-1110-WDONT (Hardware Ver. 3.7L).

 

[thatayush]

It's a BSNL issue. You will have to ask the LCO person's manager to kindly help you raise issue with the AGM. All v6 issues are handled by Bengaluru NOC and will take a couple weeks, if not month or 3.

Why the AGM? The local NOC team or even the SDE may not understand that v6 is not working. You might have to go through them first though. Keep patient and slowly explain this issue and it'll be raised and fixed.

 

[f0r3he4d]

you should be receiving a /64 prefix from dhcpv6 are u getting that?

 

[!!..PD..!!]

@itsureya What issue are you facing?

 

[itsureya]

Thanks for the insight @thatayush. I think I'll email my city's CSC to redirect my message to the correct team.

I tried enabling dhcpv6 but my devices aren't getting any v6 address with that.

The main issue here according to me is, I am receiving a somewhat ULA address (withing their network) but with a GUA prefix. I can access my v6 address via Jio cellular network but not when I use a VPN like Cloudflare WARP, I can use plain AAAA DNS record for a domain but not a cloudflare proxied one. I use Pi-hole as my DNS and I can monitor all the queries my devices are making and as soon as I enable IPv6, all the queries by my mobile devices are through IPv6. Now, if I am not wrong, any query made to a server outside of my accessible network (let's say hosted outside India) would simply not resolve unless it switches to IPv4. So, I see a slight to major drop in performance after enabling IPv6.

 

[thatayush]

@itsureya yes you're not half wrong. If you look up the v6 received on the screenshot at https://bgp.tools, you will find that it's a non-routed prefix, or one that's not popping up on the global route table. As far as I'm aware all the customers are supposed to be on 2001:4490:4c98::/46 instead of 2001:4490:48b0::/46. Hence my conclusion.

Your v6: https://bgp.tools/prefix/2001:4490:48b0::/46
The correctly routing known v6: https://bgp.tools/prefix/2001:4490:4c98::/46

 

[sayantan45]

@itsureya Mine seems fine.

Screenshot 20251101 153843 — Postimages

postimg.cc

 

[itsureya]

Well it finally happened. yay. 4 months.

Worst part was, emailing to my state NIB is like talking to thin air. I wouldn't know if they read it, I wouldn't know if they even saw it, there is no reply. I would occasionally check bgp.tools once or twice a month hoping they fixed it. I checked it a few days earlier and there was finally an upstream.

Thanks again to thatayush

 

[thatayush]

Finally, 4 months is certainly a new record.

 

[alap4m]

Hello All!!!
It has been more than TWO Years since I posted in this thread.
BSNL SDO enabled IPv6 between June and October 2025.
The IPv6 online testing platforms confirms IPv6 too.
Strangely, Speed-test results is HALVED with IPv6 enabled.
I have 100Mbps Plan. In IPv4 Speed ranges from 65 to 95 Mbps. However, after enabling IPv6, the Speed drops to 35 to 45 Mbps. Any idea why and how to address this?
I am using Openwrt router with latest stable firmware.