Airtel is rolling out IPv6 on their wired broadband services

R

rohitks

Messages
95
Location
Maharashtra, India
ISP
Airtel
on airtel so far i was getting double the speed on fast.com but now even if i have ipv4 & ipv6 the effective speed is same as my plan?
anyone getting the same observation now?
 
dkdhanda8

dkdhanda8

Messages
152
Location
Punjab
ISP
Airtel Xstream
My upload speed seems to be lower at peak times like 2:1 ratio
 
C

Chip

Messages
947
Location
Pune
ISP
FTTH: Airtel, TPBB, BSNL
LTE: Airtel, Jio, Vi
It has finally happened. My connection or rather the area of the city that I live in was upgraded to IPv6 most likely yesterday after a downtime of about 6 hours during which I think they upgraded their backend equipment. My ONT, the Nokia 2425A, was automatically pushed the configuration and WAN settings now show IPv4/IPv6 instead of "IPv4" previously. Also, DHCPv4 assigns a public IPv4 address even today unlike others in some cities where Airtel has shifted to CGNAT. So I get both a public v4 and v6.

So once I had discovered this change I had to experiment. Everything works like a charm when connected to the ONT's wifi but pfSense obviously requires extra configuration. For pfSense, configuring WAN for DHCPv6 assigns a v6 address to the WAN connection. However I am unable to get it to delegate to the LAN port and of course other LAN devices. Some more trial and error is required.

Also, I found using a static IPv4 on pfSense disables IPv6. So basically you need to choose what you want. I am sticking with a static v4 for now. I am paying for it so may as well use it.
 
I

ishanjain28

Messages
388
Location
UP
ISP
Precious Netcom 100mbps x2 & Airtel LTE Failover
@Chip Are they giving a /64 or a larger block? Is it possible to get a larger block than a /64?

Also, is the prefix static or dynamic? as in, do you get a different prefix if you stop the tunnel for 10 minutes and start it back up or do you get the same prefix again?
 
C

Chip

Messages
947
Location
Pune
ISP
FTTH: Airtel, TPBB, BSNL
LTE: Airtel, Jio, Vi
@ishanjain28 The Nokia ONT is configured with a /64. These v6 addresses will be dynamic as the default setting is DHCPv6-PD. I used the same settings on pfSense and it assigned a v4 and v6 to the WAN port.
 
C

Chip

Messages
947
Location
Pune
ISP
FTTH: Airtel, TPBB, BSNL
LTE: Airtel, Jio, Vi
Guys, do note, v6 does not work with static IPV4. You must have PPPoE v4 connection as that is used to request a v6 address. Checked it twice already and reverted to static. Of course I will experiment more in due course.

In a nutshell with Airtel you either have:
1) A paid static IPv4
or
2) A PPPoE dynamic public IPv4 (CGNAT in some places) + a dynamic IPv6.

It's your choice.

I am not sure how it is set up in your cities/States. If someone has a 3rd party router and has a static v4 please experiment and let me know. First please ascertain if v6 is rolled out in your area. Remember, in metros/Tier 1 cities they are rolling out in phases. It MAY be experimental so if v6 is shut off don't be disappointed because your connection is perfectly functional with a v4. :D
 


P

panks21

Messages
213
Location
Delhi
ISP
Airtel Static IP
@Chip I can confirm. Both of your points are correct. I have static IPv4 and IPv6 doesn't work with that
IPv6 works with PPPoE only
BTW please feel free to DM me in case you need help with IPv6 on PFSense. I have done it multiple times on both OPN and PF Sense on Airtel
 
I

ishanjain28

Messages
388
Location
UP
ISP
Precious Netcom 100mbps x2 & Airtel LTE Failover
These v6 addresses will be dynamic as the default setting is DHCPv6-PD
This is irrelevant. They can still give you the same prefix every time.
 
I

ishanjain28

Messages
388
Location
UP
ISP
Precious Netcom 100mbps x2 & Airtel LTE Failover
@GR2 Ridiculous. How are they expecting anything to work with a deployment like this. :/

Has anyone here tried requesting a larger prefix using dhcpv6? Does that work? (Set prefix hint to 60 or larger and then check if it got a larger prefix?)
 
C

Chip

Messages
947
Location
Pune
ISP
FTTH: Airtel, TPBB, BSNL
LTE: Airtel, Jio, Vi
@ishanjain28 I am not sure if the prefix remains constant or not, haven't experimented enough and frankly couldn't care too much as I am on a static IPv4. But the Nokia ONT has a /64 PD value which means the first 64 bits are probably constant and will work per their DHCP server configuration. I will need to check if it accepts a /60 or higher but I doubt it.

So I used the same /64 PD value on pfSense and it worked pretty well till I realised it did not assign a v6 to devices on the LAN. Obviously that requires more tinkering which I may resort to in due course with some tips from @panks21

Thanks @panks21! Can you share a screen shot or just a small post with your Airtel v6 WAN settings and that of any changes to LAN, track interface for example, and pfSense RA. I have v6 configured properly for Tata Play and those settings remain permanent. Not sure how Airtel differs.
 
Last edited:
C

Chip

Messages
947
Location
Pune
ISP
FTTH: Airtel, TPBB, BSNL
LTE: Airtel, Jio, Vi
Guys, this is the Airtel Nokia ONT IPv6 PD value (/64).

ejv3HIl.jpg
 
D

doineedto

Messages
104
Location
Thane
ISP
Airtel Xstream Fibre
Same here! Getting a /64 address on the Nokia ONT, but a /128 address on the bridged router. Previously used to get a /64 address on the bridged router as well.
Effectively, none of the downstream devices can use IPv6.
 
C

Chip

Messages
947
Location
Pune
ISP
FTTH: Airtel, TPBB, BSNL
LTE: Airtel, Jio, Vi
@doineedto I am able to get a v6 via the Nokia router on all downstream devices. Anything downstream may be assigned a /128 including your bridged router. However I need to check if its a 64 or 128.

Please recheck your v6 settings to confirm. Other downstream devices may be assigned a v6 by the Nokia provided you have switched off DHCPv6 on your personal router. At the most just keep RA on, letting the Nokia via Airtel's DHCPv6 do the work.
 
D

doineedto

Messages
104
Location
Thane
ISP
Airtel Xstream Fibre
@Chip forgot to mention that I am not on pfSense.
I am able to get a v6 for all the clients connected to the Nokia ONT. But we enable bridge mode just so that we don't have to use the Airtel ONT right! 😅
I thought that the bridged device is considered a separate connection, not a downstream of the Airtel ONT. So technically it should be getting a /64 address right?