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IPv6 address preferred_lft forever?
https://forum.linode.com/viewtopic.php?f=19&t=11526
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Author:  ingber [ Sat Jan 10, 2015 3:33 pm ]
Post subject:  IPv6 address preferred_lft forever?

On my Ubuntu 14.04.1 I can see ipv6 addresses:
% ip -6 addr
...
inet6 XXXX:XXXX::XXXX:XXXX:XXXX:XXXX/64 scope global dynamic
valid_lft 2591986sec preferred_lft 604786sec

For this address I would like to set preferred_lft forever. I have in my /etc/network/interfaces file:
## up /sbin/ip -6 addr add XXXX:XXXX::XXXX:XXXX:XXXX:XXXX/64 dev eth0 preferred_lft 0
up /sbin/ip -6 addr add XXXX:XXXX::XXXX:XXXX:XXXX:XXXX/64 dev eth0 preferred_lft forever
where I changed preferred_lft from 0 to forever. However, after a reboot this has not changed the above output of `ip -6 addr` ?

It seems the interface file is not being read (properly)?

A ping6 on this address works fine.

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