2 ms·
I think you are a bit confused. A global address is an address that is routable over the internet. You can reach it from anywhere as long as your firewall perm
by pantalaimon 4y ago
I think you are a bit confused.
A global address is an address that is routable over the internet. You can reach it from anywhere as long as your firewall permits so.
A link-local address is never routed. It is only valid on a single network segment.
You can use it if your uplink is down and you don't have multiple networks at home. It is usually derived from the MAC address of your NIC.
There are some special link-local multicast groups, ff02::1 is the 'all nodes' address. If you send something there it will be received by all hosts on the link.
ff02::2 is 'all routers' - this will be received by all routers on the link. There are more [0].
If you have multiple internal networks and want to reach hosts without an uplink, you can use the unique local address range fc00::/7
This functions just like 10.0.0.0/8 on IPv4 and is only routed within your site.
[0] https://www.iana.org/assignments/ipv6-multicast-addresses/ipv6-multicast-addresses.xhtml#link-local https://www.iana.org/assignments/ipv6-multicast-addresses/ip...