TataPlay Fiber does not provide True Static IPv6 (Asus Engineer)

[tatyasky]

My Asus router when connected in Bridge Mode was not getting it's own IPv6. From below screenshot, you can see that my Asus Router does not get it's own WAN IPv6. That filed remains blank. All other devices on network however get a temporary IPv6. Below is my router's screenshot.

With month long email echange with remote access to my PC, Asus engineers found out that TataPlay ISP is to blame. The concluding email is as follows.

Hi Tatyasky,

So when you use the PC to directly connect to the connection line provided by the ISP, it can only be set to Static IPv6.
But when you connect to the connection line provided by the ISP through the Router, it can only be set to Native IPv6.
Is there anything wrong with this that there are two ways to set up IPv6?

Do you set "Automatic IP" or "PPPoE" in "WAN Connection Type" in "WAN - Internet Connection" page?
In general, if "Automatic IP", the setting in IPv6 should be "Passthrough".
If it is "PPPoE", it should be selected as "Native".

And if you select "Native", it seems that because your ISP does not provide "Non-temporary Address", the Router cannot obtain the WAN IPv6 Address, but only LAN IPv6 Address.
Although the LAN IPv6 Address can also connect the Router or the LAN Client to the IPv6 network normally, the DDNS function must be operated through the WAN IPv6 Address, so you cannot use this function.
You may need to discuss with your ISP company why there is no "Non-temporary Address" in their DHCPv6 packets.

Thank you.


Best regards,

Kengi Peng (彭冠傑)


The statement in Bold says it all.

When it works correctly (Someone's image of non-Indian ISP), one gets a proper WAN IPv6. Below is their screenshot for comparison.

Some forum members tell that ours is correct implementation of static IPv6. Apparently NOT !!!! BTW IPv6 stops working if set as Passthrough mode like the above screenshot.
Indian ISPs are slowly pissing me more and more day by day.

 

[thecooldean]

Not sure if this is gonna help, I'm not tech savvy, but here's a screenshot with my ACT connection.

 

[tatyasky]

@TheCoolDean This means ACT has correct IPv6 implementation where they allow Non-Temporary addresses in DHCPv6. Awesome!

I had a talk with TataPlay support and they told me people don’t require Non-Temporary addresses to access internet.

 

[Lolita_Magnum]

Yes, DHCP-PD (Prefix Delegation) is not really native IPV6 since the router is not the one giving out IP addresses, but there are no performance penalty nor public connectivity issues because of this.
Judging by your config on the screenshot above, your router should still be accessible from outside.

 

[tatyasky]

No it is not accessible. Even Asus engineer tried accessing but failed because router itself doesn’t have WAN IPv6 address. It however does have LAN IPv6 which is accessible only from LAN. Adding that IP to IPv6 firewall doesn’t help either.

 

[Lolita_Magnum]

Are your devices accessible from outside via IPV6?

 

[thecooldean]

sorry if off-topic but when I go to IPv6-test.com I get hostname servfail error, any idea how to fix it? My score is 18/20.

 

[Lolita_Magnum]

@TheCoolDean nothing to be worried about, it just means your ISP does not have Reverse DNS entry for your IP.

 

[tatyasky]

Are your devices accessible from outside via IPV6?

Yes all devices except the router itself. I need access to router to wake up device if I am not home.

 

[igloo]

From my airtel connection on TP-Link router i can conclude wan ip of router is completely diff from lan prefix of devices and both having /64 prefix.
I guess tata is trying to be oversmart or over conservative(whichever way you like) by saving from every customer /64 wan ipv6 address aka 2^64 /128 addresses i.e. 18,446,744,073,709,551,616 unique ipv6 addresses.