IPv6 being issued by BSNL Broadband!

[varkey]

I don't think it should matter, LCO just takes care of last mile connectivity, everything else is through BSNL. Anyway my connection is through an LCO.

 

[philip]

I am also from kerala and till last monday it was still ipv4 with me. I hope they implement ipv6 in my area too..

 

[varkey]

You need to ensure IPV6 is enabled in your ONT/router config, else it would only give IPV4.

 

[philip]

How can I do that?

 

[varkey]

Would vary from device to device, just check your WAN profile in the ONT if it has an IPV4/IPV6 option. By default it might be set to IPV4 only mode.

Check @Ameen's screenshot from earlier -- IPv6 being issued by BSNL Broadband! | BSNL FTTH Bharat Fiber Broadband

IP Protocol Mode should be set to IPV4/IPV6

 

[eriek_halenx]

@varkey, @Ameen
Should any of the below settings be modified ? Its in the WAN settings / ipv6 block.

IPv6 Info Get Mode	Manual Mode Auto Mode
GUA From	SLAAC Static DHCPv6
DNSv6 From	SLAAC Static DHCPv6
Prefix Delegation From	Static DHCPv6
GUA From Prefix

--edit-- adding screenshot

 

[varkey]

Would be great if you could share the screenshot from the UI, but you could try Auto Mode, DHCPv6, DHCPv6, DHCPv6

 

[varkey]

So far IPv6 on BSNL seems great, no issues so far.

I'm waiting to test how well WAN failover would happen now with IPv6 in the mix. I've configured failover only for IPv4 as of now. (Using mwan3 on OpenWRT) I'm hoping that if BSNL connection drop, things would fallback to IPv4 over the backup connection automatically.

 

[vignesh_venkatesan]

@varkey iirc you have Jio 4G as backup wan right ?
So both of your wan uplinks support ipv6 so it shouldn't be problem right ?

 

[varkey]

Yes, I do use Jio 4G as the backup WAN. But unlike BSNL, for Jio, there is no prefix delegation, so the client devices don't get a routable IPv6 address.
So if BSNL, is up, it could use one of its own IPv6 addresses to go out without NAT.

Some outstanding questions in my mind. If BSNL fails, would it then use the Jio 4G IPv6 through the local IPv6 addresses? Is there NAT involved when a client device go out over Jio IPv6?

There are multiple IPv6 addresses getting assigned to client devices. The 2001 addresses are BSNL's, the fd13 ones are assigned by my router.

I'm still trying to fully understand how it all works (getting my hands dirty with IPv6 only now). Will keep the thread updated as I learn more.