To which destination will a route appear in the Linux routing table after activating IPv6 on a router's network interface, even when no global IPv6 addresses have been assigned to the interface?
I just tested here and can confirm it's actually fe80::/64
I've installed a couple of VMs and checked the route with (route -6) and that's the only one that comes up from the options there
IPv6 link-local addresses are defined by RFC 4291 (IPv6 Addressing Architecture) and are covered by the prefix fe80::/10. In practice, only fe80::/64 is used.
https://labs.ripe.net/author/philip_homburg/whats-the-deal-with-ipv6-link-local-addresses/
This cisco article describes in what range a link local address is - but the used adresses are in 64-bit subnet. Think about this: 10.0.0.0/8 is an a-class ipv4 network, but most people use 10.x.x.0/24 ranges.
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