Kindly post Speedtest results to US, UK, etc servers with your connection details.
- Thread starter samiryadav
- Start date
I know the difference between wan & lan network but what I am trying to understand is how are you getting a /64 subnet on lan from /128 subnet on wan which is how it is supposed to work by default unless your device is using another IPv6 DHCP server specifically to give /64 subnet on lan side but then that IPv6 range is not accessible from wan side/internet as it is purely internal/pvt IPv6 range.
not getting /64 from /128. Both are assigned independently from different subnets that Airtel holds. /64 is routed through the /128. If there are any incoming connections to my ip in my /64 lan side, Airtel first routes those to the /128 on my WAN, and the router decides what to do with the incoming connection. Since my router knows there are devices with those ip addresses on my lan, it will route to the correct device, unless I have rules blocking that. The /64 ipv6 on lan is not private, it is part of a /48 that airtel is advertising.
"/64 is routed through the /128"-->I don't know how airtel is achieving this. Typical/standard is that ISP provide a /64 (the bare minimum required for IPv6 practically because of android IPv6 requirement) to wan side which then gets distributed over lan to give all the lan devices a globally unique IPv6 address all in the same range. This setup is not preferred by many because it means the entire network cannot be further segmented into guest/IoT if those devices also need IPv6 globally unique address. Most ISPs in developed nations therefore typically provide /60 or larger subnet range to allow customers to divide their lan into 2-3 segments each with /64 range. What setting is there in airtel router for IPv6 DHCP server for wan & lan side?
"/64 is routed through the /128" --- essentially my airtel router tells the gateway it is talking to, that : "Hey, this /128 is where you can reach me. I am also announcing that this /64, which is a different subnet, is behind me. If someone is looking for any of the /64 devices, please send them to me. I will take care of them." Also, the requirement is that you need a /64 for the android device to get its SLAAC address, not that the /64 should be on the WAN side. A larger subnet like /56 or /48. or God forbid, /60,61,62,63 is also being used some ISPs. something at nibble boundaries, like /60, 56, /48 helps in prefix delegation.
