Subnet IPv6 settings Telenet

[Markc1]

Telenet question.

This is my IP (IPV6):

2a02:xxxx:xxxx:xxxx:ba54:6141:82dc:5812

This is the questionable ip:

(2a02:xxxx:xxxx:xxxx:3785:4335:1743:d408)

Is this part always associated to one address or is this subnet shared with multiple locations:

2a02:xxxx:xxxx:eg00 

Is the subnet on telenet shared with neighbors for the line or individual per household.

Content adjusted by Suzy (admin) | Reason: full public IPv6 address visible

[BandR]

As far as I know, Telenet hands out 2 IPv6 addresses:

1 for the Wan interface (a /128) and a subnet of length /56 for the LAN prefix, which is all pretty standard I believe.

So there's no IPv6 "sharing" (why would you share anything in IPV6??), everyone gets a /56 for his/her home

[Markc1]

Thanks so if the first four elements of the address are unique per individual household? It is not shared with other houses. (After that the Mac address.)

Xx:xx:xx:xx are unique per household?

[Arnie]

Subnets are not shared per household. Each modem/router receives its own unique /56 prefix/subnet.
All of those /56 subnets do come out of a larger network, belonging to Telenet. but they are separated from each other thanks to the prefix length.

[Markc1]

So in response. If I see the first four elements it is unique to a house not shared?

Sorry just want to clarify.

As tracking the IP goes to a central location 

[BandR]

user gets indeed a /56, so putting that towards a hex representation gives:

xxxx:xxxx:xxxx:xx::/56, which is then your /56 prefix, leave the 8bits at the end to use on LAN side, needs to be in /64 format.

And your neighbour could get e.g. xxxx:xxxx:xxxx:xY::/56

the second part of the address is the host part, which is lots of the times a random 64 bit number, older installs still use EUI-64, which is derived from the MAC address of the device.

[Markc1]

great answer thanks. so how telenet is setup and configured is that all residential home addresses recieve xxxx:xxxx:xxxx:xx::/56 which is unique for them. 

what i am worried about is if an ip address subnet xxxx:xxxx:xxxx:xx is shared with others on the same shared neighbourhood line (as in between two houses or a street).  

but in this case i can concur by your answer if i have the first four parts of the ip xxxx:xxxx:xxxx:xx it came from that location. as in telenet doesnt share those subnets between resi customers (unless obviously they renew there ip ?)

[Markc1]

Effectively one can isolate a location with first four parts of the address it goes to one residential house.

Concur?

[Arnie]

There's never sharing of a subnet over different households, because routing would break.

In case of a /56 used, the first 14 hex characters becomes the network part of the address, for example your address is:

2a02:0000:aaaa:bbbb:cccc:dddd:eeee:ffff

This means it belongs to the /56 networ: 2a02:0:aaaa:bb00:: 

Your neighbors mights have 2a02:0:aaaa:bc00:: and 2a02:0:aaaa:bd00:: , but could also have received an address from another range.

Telenet keeps track of where each /56 network is used, so it can route traffic to the right residential router to reach it. This means a /56 network can only be used at one location at the same time.

In the example of the /56 networks 2a02:0:aaaa:bb00::  , 2a02:0:aaaa:bc00:: and 2a02:0:aaaa:bd00:: they are all unique, non shared subnets

Here's a helpful tool: http://www.gestioip.net/cgi-bin/subnet_calculator.cgi

[BandR]

As far as I know, there's no guarantee to fixed IP, not in IPv4, nor in IPv6.

I believe the v6 prefix is pretty steady @ Telenet, but Telenet does not commit to it being fixed. A customer however can opt-in for a fixed IP, but it's not free of charge.  I believe fixed IPs were rather popular some time ago (hosting a server or something maybe), but with the presence of cloud stuff these days probably less popular, although of course it can still be of certain value. 

So, the IPv6 LAN /56 prefix can change, but will never be shared.

[Arnie]

I believe a fixed IP address is a payable option, only available for business customers, not residential customer

When ordering this you'll get a fixed IPv4 address (based on the MAC address of your routers WAN interface), and a fixed IPv6 prefix (based on the DUID).

[Markc1]

Thanks everyone for that. The reason for the question was as follows. An email account was logged into from two locations.

Location 1: My house. axx.xxa.axx.xxa .

Location 2: bxx.xxa.bxx.xxa . 

Location 2 i got the address sent to me and am aware of its IP with the full mac. My question was to be certain the IP that i believe in location 2 was in location 2 and could not possibly be shared. As in was the subnet shared with neighbours etc. I received both IP's information on the same day so they correlated (as in were not renewed or changed). 

Reason for the question was due to not understanding how telenet setup the network. So now i know the subnet is per house i can understand that the email address was logged into from the other location. As indicated above the MAC on the device constantly changes so anything after the first 4 parts of the address is hard to track.

Thanks to all!