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Groups > linux.debian.user > #205119

Re: IPv6 addresses

From Pascal Hambourg <pascal@plouf.fr.eu.org>
Newsgroups linux.debian.user
Subject Re: IPv6 addresses
Date 2019-02-07 20:10 +0100
Message-ID <xoXdD-5aa-5@gated-at.bofh.it> (permalink)
References <xoNR0-7Ts-7@gated-at.bofh.it> <xoO0F-7WN-9@gated-at.bofh.it>
Organization linux.* mail to news gateway

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Le 07/02/2019 à 10:15, Richard Hector a écrit :
>>
>> # this one should hopefully configure via SLAAC
>> iface ens3 inet6 auto
>>
>> # this one is for my static stuff (using a ULA prefix)
>> iface ens3 inet6 static
>>    address 2001:db8::1/64
>>    up ip -6 route add ...
>>    up ip -6 route add ...
>>    up ip -6 route add ...
>>
>> But I don't get the SLAAC address. The only way I've managed to get the
>> SLAAC address plus the static, is to have a single auto stanza like this:
>>
>> iface ens3 inet6 auto
>>    up ip -6 addr add 2001:db8::1/64 dev ens3
>>    up ip -6 route add ...
>>    up ip -6 route add ...
>>    up ip -6 route add ...
>>
>> Incidentally, that also gives me an autoconfigured address (based on the
>> MAC) in the 2001:db8::/64 prefix, which I don't think I need.

Huh ? Isn't it the autoconfigured address you expect to get from an 
"auto" stanza ?

>> Does that suggest a bug in ifupdown? Or am I interpreting something wrong?

I would call it more an unforeseen consequence.

> Actually, if I put the 'auto' stanza after the 'static' one, it does
> work (I still get the autogenerated address in the ULA prefix).
> 
> Is it supposed to be order-sensitive?

Yes. "auto" sets autoconf=1 to enable SLAAC, and "static" sets 
autoconf=0 by default, which disables SLAAC and removes any 
autoconfigured address.

> I can also make it work by adding 'autoconf 1' to the static stanza, and
> omitting the auto stanza.

This is the right way to go.

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Thread

IPv6 addresses Richard Hector <richard@walnut.gen.nz> - 2019-02-07 10:10 +0100
  Re: IPv6 addresses Richard Hector <richard@walnut.gen.nz> - 2019-02-07 10:20 +0100
    Re: IPv6 addresses Pascal Hambourg <pascal@plouf.fr.eu.org> - 2019-02-07 20:10 +0100
      Re: IPv6 addresses Dan Ritter <dsr@randomstring.org> - 2019-02-07 20:40 +0100
        Re: IPv6 addresses Richard Hector <richard@walnut.gen.nz> - 2019-02-08 04:10 +0100
      Re: IPv6 addresses Richard Hector <richard@walnut.gen.nz> - 2019-02-08 04:10 +0100
        Re: IPv6 addresses Pascal Hambourg <pascal@plouf.fr.eu.org> - 2019-02-08 19:50 +0100

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