I use https://www.vultr.com/tools/subnet-calculator-ipv6/ to get the "Address Range Start" and "Address Range End" of my Linode VPS, I then added the IPs in /etc/network/interfaces and everything did work as expected.
However I have two different Linode instances now and even though I get different IPv6/64 IPs, when I use the subnet ipv6 calculator, I get identical start range and end range. Why is this happening? How can I get a list of IPv6 ips that I can use?
The two IPs are
2600:3c03::f03c:91ff:fee5:1c9a / 64 2600:3c03::f03c:91ff:fe60:42fb / 64