On 12/11/2020 12:13, Chris Bell via GLLUG wrote:
On Thursday, 12 November 2020 11:49:25 GMT John Winters via GLLUG wrote:
On 12/11/2020 11:44, Chris Bell via GLLUG wrote:

[ about difficulties configuring persistent IPv6 addresses ]

Hi Chris,

I've found that I needed to use two different strategies depending on
whether the initial address is configured statically or picked up
automatically.  If you tell me which you're doing I will dig out my
notes on the relevant approach.
[snip]

I am trying to get both working,
[snip]

OK.  For static addressing I put the following in

/etc/network/interfaces.d/eth0

auto eth0
allow-hotplug eth0
iface eth0 inet dhcp

iface eth0 inet6 static
        address 2001:8b0:e9:1::4008
        netmask 64

That then is the only global IPv6 address the i/f gets.
(Note that the IPv4 address is still being picked up via DHCP.)

For a system which is picking up its addresses dynamically (i.e. one where /etc/network/interfaces contains comments, but nothing else) I put the following in /etc/dhcpcd.conf

interface eth0
static ip6_address=2001:8b0:e9:1:4001/64

The interface is then configured with this global address in addition to the one which it gets automatically.

HTH,
John

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