Comment by eqvinox

7 hours ago

> I don’t have any idea how they got the ip,

You might've been using DHCPv6 assigning sequential addresses starting at 1?

Remember: friends don't let friends use DHCPv6[*]. Help out, uninstall DHCPv6 today.

[*] in IA_NA mode (address assignment). PD and stateless info-only are fine.