* Peter Humphrey:

> $ ping6 vdsl
> ping: vdsl: No address associated with hostname

The outcome of ping depends on /etc/resolv.conf and /etc/hosts, and even
on the OS of the IPv6 nodes involved. Apple devices will be available as
somename.local, with "somename" being what the user configured as the
device's name in Preferences->Sharing. I can for example ping my iPhone
via "ping6 silver.local".

> If I add the LAN address of the Bipac to /etc/hosts, ping finds it
> okay, but what if the address changes if the Bipac reboots?

Your Bipac will have multiple "LAN addresses", or rather addresses that
are bound to the LAN-facing network interface. In your example, you were
pinging the global scope address 2a02:x which may change over time,
unless your provider assigns static networks (mine does not). However,
the router should also have at least one link-local address and one
unique local address (ULA):

  Global scope: 2a02:8010:x (may change or may not)
  Link local: fe80:y (may change with SLAAC privacy extensions)
  ULA: fd67:z (should be fixed)

With my router, the ULA was set up once when I first picked a random ULA
prefix, and has remained immutable since then.

> I see my mobile phone has acquired an IPv6 address starting with
> fe80::40be... and it doesn't look like its MAC address.

That's not actually a bad thing. I mentioned SLAAC privacy extensions
(RFC 4941) before; [1] offers some explanations.

[1] 
https://www.internetsociety.org/resources/deploy360/2014/privacy-extensions-for-ipv6-slaac/

-Ralph

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