[nickcw]

Link local addresses are exactly that. They don't route and they are for low level stuff like adding stuff to the routing table or BGP.

If you want to do this properly then you configure a Unique Local Addresses (ULA) out of the range fc00::/7. These are the equivalent of 192.168 or 172.16 or 10. and they can be routed.

Trying to run services on fe80: addresses is a mistake IMHO

[frollogaston]

So then shouldn't the link-local address be either MAC-derived or random, especially if you have multiple ifaces? The article's fe80::4 example seems weird. Mine is fe80::18cf:85a3:bc97:d117.

[lxgr]

It usually is, but I don't think it has to be. You can definitely manually assign link-local addresses.

[Dagger2]

Note that even a MAC-derived link-local may not be unique, since the same MAC can be on both networks (e.g. with VLANs, or if you assign MACs to hosts instead of NICs).